496 results on '"Buckling"'
Search Results
2. Static Buckling and Free Vibration Analysis of Bi-Dimensional FG Metal Ceramic Porous Beam.
- Author
-
Shabani, Y., Mehdianfar, P., and Khorshidi, K.
- Subjects
MECHANICAL buckling ,FREE vibration ,FUNCTIONALLY gradient materials ,POROUS materials ,THICKNESS measurement - Abstract
This study presents an analytical solution for static buckling and free vibration analysis of bi-dimensional functionally graded (2D-FG) metal-ceramic porous beams. To achieve this goal, equations of motion for the beam are derived by using Hamilton's principle and then the derived equations were solved in the framework of Galerkin's well-known analytical method for solution of equations. The material properties of the beam are variable along with thickness and length according to the power-law function. During the fabrication of functionally graded materials (FGMs), porosities may occur due to technical problems causing micro-voids to appear. Detailed mathematical derivations are presented and numerical investigations are performed, while emphasis is placed on investigating the effect of various parameters such as FG power indexes along both directions of thickness and length, porosity, and slenderness ratios (L/h), on the non-dimensional frequency and static buckling of the beam based on new higher deformation beam theory. The accuracy of the proposed model is validated based on comparisons of the results with the accepted studies. According to the result in both buckling and vibration analysis, the presented modified transverse shear stress along the thickness has shown closer consequences in comparison with TBT. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Research progress of composite cylindrical shells.
- Author
-
Zhang, Liwei, Zhao, Liyuan, Pan, Lin, and Gao, Jiangang
- Subjects
- *
CYLINDRICAL shells , *AEROSPACE engineers , *STABILITY theory , *CIVIL engineering , *COMPOSITE materials - Abstract
Composite cylindrical shell (CCS) structure are a number of engineering applications in aerospace, civil engineering, ordnance industry, sports equipment and other fields because of their excellent mechanical properties, low density and strong design. In this study, the classification, preparation technology and mechanical test of CCS are summarized. The research on the axial compression strength of CCS is reviewed. The theory of axial compression elasticity and the strength criterion of orthotropic composite materials are analyzed, and the strength criterion is compared. Finally, the basic theory of instability and buckling is deeply analyzed, and the stability theory of CCS is analyzed in detail. In order to provide a new reference for future scientific research and engineering application, the research difficulties are given in the conclusion, and the future research direction is predicted. Highlights: Comparing and analyzing the classification, preparation technology and mechanical properties of composite cylindrical shells (CCS) comprehensively.Summarizing and analyzing the axial compression strength of CCS in depth, and analyzing the theory of axial compression elasticity and the strength criterion of orthotropic composite materials thoroughly.Analyzing the basic theory of instability and buckling in depth, and analyzing the stability theory of CCS in detail.Giving the research difficulty of composite cylindrical shell, and predicting the future development direction of CCS. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Investigations Into the Stability of Thin-Walled Composite Structures with Top-Hat Cross-Sections.
- Author
-
Czajka, Błażej
- Subjects
COMPOSITE structures ,MECHANICAL buckling ,FINITE element method ,NUMERICAL analysis ,COMPOSITE materials - Abstract
This paper presents a study of compressed thin-walled composite columns with an open cross-section. The tested specimens with a top-hat cross-section were made of CFRP material. Two arrangements of composite layers [0/-45/45/90]s and [90/0/90/0]s were compared. The paper focuses on the buckling phenomenon and the determination of the critical loads of the structure. It includes both numerical analyses using the finite element method (FEM) and validation on real specimens made using the autoclave technique. A comparison is made between the results obtained by both methods. The critical forces of the real specimens were determined using the P-wc3 approximation method. Both the evaluation of the buckling shape and the values of the critical forces showed a significant correlation between the experimental and numerical tests. This paper also compares the tested lay-ups. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
5. Truss Metamaterials: Multi-Physics Modeling for Band GapTuning.
- Author
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Calegaro, Daniel and Mariani, Stefano
- Subjects
BAND gaps ,METAMATERIALS ,PIEZOELECTRICITY ,COMPOSITE materials ,ELASTIC waves ,PIEZOELECTRIC composites - Abstract
Periodic elastic metamaterials (EMMs) display the capability to forbid the transmission of elastic waves for certain frequency ranges, leading to band gaps. If topology optimization strategies are exploited to tune the band gaps of EMMs, the said band gaps cannot be modified in real-time. This limitation can be overcome by allowing for active materials in the design of EMMs. In this work, a hyperelastic piezoelectric composite was considered to assess the coupled effects of material and geometric nonlinearities on the behavior of sculptured microstructures featuring a three-dimensional periodicity. Specifically, it was assumed that the composite material is obtained by embedding piezo nanoparticles into a soft polymeric matrix. In this way, piezoelectricity and instability-induced pattern transformation could be fully exploited to actively tune the band gaps. A thermodynamically consistent multi-physics model for the active composite material is discussed and implemented in a general-purpose finite-element code. The reported results of the simulations showed how the band gaps are affected by the aforementioned nonlinearities and by a feature of the architected periodic cell linked to its topology. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
6. Delamination Buckling of Composite Conical Shells Under External Pressure.
- Author
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Nagendranath, A., Khalane, Sanjay A., Gupta, R.K., and Rao, C. Lakshmana
- Subjects
CONICAL shells ,MECHANICAL behavior of materials ,METALLIC composites ,COMPOSITE materials - Abstract
Airframe construction in conical form is the most desired shape of flight hardware due to their low drag profile and are located at the fore-end region of flight vehicles encountering high drag loads. Owing to their tailoring capability, materials with orthotropic mechanical properties are preferred choice. Delamination defects formed in them while manufacturing or when subjected to loads would unfavorably influence the mechanical performance of the orthotropic airframe. In the current work, FE simulation of delamination which is embedded in orthotropic cone shaped shells under external pressure load is performed as per the method cited in published literature. A layer wise element based on shell theory has been used and the effect of delamination size and its through the thickness position on the mechanical performance of the cone shaped shell is investigated. Circumferential and rectangular shapes of defects have been simulated. The investigation is performed for metal and composite materials with 3 types of stacking sequences generally used in practical designs. Verification of the procedure is carried out by equating with the procedure cited in published studies on shells of thin orthotropic cylinders. The eigen value of the first mode is taken as the critical buckling factor under external pressure. The buckling factor of the delaminated cone is normalized with the buckling factor of the ideal cone. The normalized buckling factor is showed graphically with the normalised defect size. Global, as well as local buckling and also symmetric as well as asymmetric buckling shapes, are observed in the results of the simulation. Shift from global mode to local mode of buckling is also observed in certain cases. Drastic reduction in buckling capability with the local mode is observed when the defect location is close to the surface and more prominent for an outer surface case. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
7. Buckling performance of thin-walled filled steel columns.
- Author
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İlgün, Abdulkerim, Zia, Ahmad Javid, Sancıoğlu, Sadrettin, Soydoğan, Hasan Furkan, Köklü, Münife Hanım, Arıbaş, Semih, and Bayram, Berna
- Subjects
MECHANICAL buckling ,COMPOSITE materials ,CONSTRUCTION materials ,REINFORCED concrete ,FILLER materials - Abstract
Concrete-filled composite elements have recently gained popularity as beams and columns all over the world. They have advantages similar to reinforced concrete elements, such as the moulding process and the lack of maintenance of the filled concrete, as well as advantages similar to hollow steel elements, such as enhancing compressive strength and bending capacity by using smaller sections. In this paper, the buckling behaviour of thin-walled steel columns with circular cross-section and different filling materials was investigated under uniaxial load. Six different materials (concrete produced using normal aggregate, concrete produced using waste aggregate, waste fine aggregate, waste coarse aggregate, waste iron dust and polyurethane) were used as filling. Filled columns were compared experimentally with hollow thin-walled steel columns that had the same height and diameter. All specimens had the same length (750 mm), same diameter (60.3mm) and the same wall thickness (3mm). Experimental results were compared with analytical results obtained from a calculation done using the national steel design code, Design, Calculation and Construction Principles of Steel Structures 2016. Additionally, columns specimens were modelled in Abaqus software. Conservative and consistent results were obtained from comparing experimental, analytical, and numerical results. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
8. BUCKLING AND VIBRATION OF POROUS SIGMOID FUNCTIONALLY GRADED CONICAL SHELLS.
- Author
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XIAOLIN HUANG, JIAHENG WANG, NENGGUO WEI, CHENGZHE WANG, and BIN MA
- Subjects
MECHANICAL buckling ,VIBRATION (Mechanics) ,POROSITY ,COMPUTATIONAL fluid dynamics ,COMPOSITE materials - Abstract
In this study, the buckling and vibration of a sigmoid functionally graded material (S-FGM) shells are investigated. Two types of porosity distributions, even and uneven, are taken into account. The material properties are estimated by a new modified rule of mixture. In the framework of the classic thin shell theory, the governing equations are derived and Galerkin's integrate technique is employed to compute the critical load and natural frequency of porous S-FGM shells. The influence of pores, ceramic mass fraction and materials power index are discussed in detail. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
9. 复合材料层合板剪切稳定性试验及强度预测.
- Author
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杨钧超, 陈向明, 邹鹏, and 王喆
- Subjects
DIGITAL image correlation ,FAILURE mode & effects analysis ,COMPOSITE materials ,LAMINATED materials - Abstract
Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
10. Numerical Analysis of Mechanical Behaviors of Composite Tensile Armored Flexible Risers in Deep-Sea Oil and Gas.
- Author
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Liu, Hu, Li, Meng, and Shen, Yijun
- Subjects
PETROLEUM industry ,STEEL pipe ,NUMERICAL analysis ,STEEL strip ,CARBON composites ,COMPOSITE materials ,CARBON fiber-reinforced plastics ,NATURAL gas - Abstract
As oil and natural gas production continue to go deeper into the ocean, the flexible riser, as a connection to the surface of the marine oil and gas channel, will confront greater problems in its practical application. Composite materials are being considered to replace steel in the unbonded flexible pipe in order to successfully meet the lightweight and high-strength criteria of ultra-deep-water oil and gas production. The carbon-fiber-reinforced material substitutes the steel of the tensile armor layer with a greater strength-to-weight ratio. However, its performance in deep-water environments is less researched. To investigate the mechanical response of a carbon fiber composite flexible riser in the deep sea, this study establishes the ABAQUS quasi-static analysis model to predict the performance of the pipe. Considering the special constitutive relations of composite materials, the tensile stiffness of steel pipe and carbon fiber-reinforced composite flexible pipe are predicted. The results show that the replacement of steel strips with carbon fiber can provide 85.06% tensile stiffness while reducing the weight by 77.7%. Moreover, carbon-fiber-reinforced strips have a lower radial modulus, which may not be sufficient to cause buckling under axial compression, so the instability of the carbon fiber composite armor layer under axial compression is further studied in this paper; furthermore, the characteristics of axial stiffness are analyzed, and the effects of the friction coefficient and hydrostatic pressure are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
11. Adaptive compliant structures for fluid flow control : a 'catastrophic' approach
- Author
-
Arena, Gaetano, Pirrera, Alberto, Groh, Rainer, and Theunissen, Raf
- Subjects
629.1 ,Morphing ,Composite materials ,Air inlet ,adaptation ,buckling ,post-buckling - Abstract
Structural adaptivity is an enabling concept when an engineering system requires trade-offs between stiffness, strength, weight and functionality. Adaptive devices, that sense and react to their environment, allow the system to change geometry and/or material properties in response to external stimuli. As such, they have huge potential for a broad range of engineering applications. Mechanical instabilities and elastic nonlinearities are one of the emerging engineering design methods to facilitate shape-adaptation and multistability. Although nonlinear adaptive structures have captured the interest of the research community, they have not yet found their way into industry. The complexity of nonlinear systems and lack of controlled actuation and precise design guidelines, contribute to practical skepticism towards the application of these kind of morphing structures. This thesis illustrates a 'catastrophic' approach, in the sense of based on Catastrophe Theory principles, for the development of passively adaptive structures. Shape-changing devices are obtained by embracing elastic instabilities deriving from buckling of pre-compressed panels. A taxonomy of nonlinear post-buckling behaviours is defined and exploited as a design framework to obtain geometrical changes and multistability. The introduction of asymmetries into buckled morphing components enables tailoring of fold and cusp catastrophes, as well as the identification of regions of stability and instability. The definition of design spaces delimited by folds and cusps permits an intuitive design approach for embedding multistability and shape-adaptation into structures. This design method is used to develop a morphing inlet that can morph and adapt shape in response to external stimuli and varying environmental conditions. In particular, the inlet is conceived to be open at low airspeeds, such that air can flow freely into a connected duct. When the airspeed increases above a pre-defined critical value, the adaptive component-a glass-fibre composite plate-snaps passively and closes the inlet to the duct, such that air ceases to flow into the channel. Experimental results from wind tunnel tests replicate design features such as folds and cusps, validating the usefulness of the 'catastrophic' approach. In particular, the location of the cusp catastrophe in the post-buckling regime is of interest to the designer, as it defines the onset of the hysteretic and snapping behaviours used for shape adaptation. The general applicability of this design framework is further demonstrated by applying the same technique to the optimisation of an aircraft high-lift device component-a leading edge slat-cove filler for airframe noise reduction. The slat cove filler is designed to passively deploy and retract into the gap created by the high-lift device, in a manner that considerably reduces induced noise, while maintaining the benefits of increased lift. Given the generality of the underlying physical principles, the system's parameters can be tailored to fit specific operating conditions, and consequently, are suitable for a wide range of applications where shape adaptation and passive actuation are desired.
- Published
- 2019
12. A Numerical Study on Carbon-Fiber-Reinforced Composite Cylindrical Skirts for Solid Propeller Rockets.
- Author
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Baldieri, Ferdinando, Martelli, Emanuele, and Riccio, Aniello
- Subjects
- *
AXIAL loads , *PROPELLERS , *COMBUSTION chambers , *SKIRTS , *CYLINDRICAL shells - Abstract
A solid rocket motor (SRM) is a rocket engine that uses a fuel/oxidizer mixture in a solid state; the most commonly employed propellants are Hydroxyl-Terminated Polybutadiene (HTPB) as the fuel and ammonium/potassium perchlorate as the oxidizer. To increase the flight range of this kind of vehicle, the weight has to be reduced as much as possible. A possible element that can be worked on is the coating of the combustion chamber: the skirt. The aim of this paper is to investigate the behavior of a cylindrical skirt subjected to internal pressure load and axial thrust and to compare the performance of a skirt made of a standard steel for aeronautics purposes with a carbon-fiber-reinforced composite skirt. The motor test case is taken from the ONERA C1xb and the flowfield is simulated with an axisymmetric k-ω turbulence model. The carbon-fiber-reinforced composite skirt is a cylindrical shell with a symmetric and balanced layup [90/0/45/−45]s. To check composite layer integrity, Hashin's failure criteria were adopted while linearized buckling methods were used to assess the buckling behavior of the skirt. The composite layup was modeled by adopting the classical laminate theory. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
13. Comments on effective use of numerical modelling and extended classical shell buckling theory.
- Author
-
Croll, James
- Subjects
- *
NUMERICAL integration , *EGG quality , *COMPOSITE materials , *TRANSMISSION of sound , *AXIAL loads - Abstract
This paper argues that in the understandable enthusiasm to use the now readily available high- fidelity numerical software allowing the analysis of the complexities of shell buckling, and especially the notorious case of the axially loaded cylinder, there has been insufficient consideration of classical shell buckling theory and its more recent reduced stiffness extension. If future design is to be able to effectively exploit the potential benefits of the use of advanced composite materials and/or the use of rib reinforcement, it is suggested that these numerically driven research programmes would benefit from more explicit integration within the framework of classically extended buckling theory. This suggestion is reinforced in what follows by highlighting the results from a longstanding research programme in which classically extended buckling theory has been demonstrably enhanced through its integration with reliable numerical experimentation. This enhancement has helped to resolve a number of important issues including: identification of the most critical forms of imperfection affecting the buckling loads; how the most critical knockdown factors are influenced by changes in the shells' geometric and material characteristics and how safe design might be more explicitly related to the prescribed levels of geometric tolerances. Recommendations are made as to how such integrated research programmes could in the future further enhance our ability to design materially efficient shells against buckling. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
14. On the Design of Composite Patch Repair for Strengthening of Marine Plates Subjected to Compressive Loads
- Author
-
Nikos Kallitsis and Konstantinos N. Anyfantis
- Subjects
repair ,buckling ,finite element analysis ,composite materials ,design-of-experiments ,computational mechanics ,Engineering design ,TA174 - Abstract
Marine structures are susceptible to corrosion that accelerates material wastage. This phenomenon could lead to thickness reduction to the extent in which local buckling instabilities may occur. The majority of existing repair techniques require welding, which is a restricting factor in flammable environments where hot work is prohibited. A novel repair methodology that has attracted the research focus for over two decades is the adhesive bonding of a composite patch on a ship’s damaged plating. Although most studies have been focused on patch repair against crack propagation, restoring the initial buckling strength of corroded marine plates is of high interest. In this work, this technique is assessed using numerical experimentation through finite element analysis (FEA) with the patch’s dimensions as design parameters. The results are then evaluated using a design-of-experiments (DOE) approach by generating a response surface from central composite design (CCD) points. Applying this methodology to various plates and patches makes it possible to create a repair design procedure that specifies the minimum patch requirements depending on the metal substrate’s dimensions and corrosion realized.
- Published
- 2022
- Full Text
- View/download PDF
15. Influence of imperfection sensitivities on postbuckling of laminated cylindrical panel under axial load: Numerical and experimental investigation.
- Author
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Yenugula, Venkata Narayana
- Subjects
- *
MECHANICAL buckling , *AXIAL loads , *FINITE element method , *COMPOSITE materials , *BOUNDARY value problems - Abstract
Influence of geometric imperfections on postbuckling of layered (laminated) composite cylindrical panels has been performed under axial compression load using finite element code, ANSYS and validated experimentally. Finite element code was initially validated with available literature for performing the further analyses on the panel. Eigen imperfection irregularities were considered for predicting postbuckling loads of layered composite cylindrical panels with SSSS and SFSF boundary conditions with different r/t ratio and ply sequence and compared the results. Glass-polyester laminated cylindrical panels were fabricated and tested using fixture which accommodates different boundary conditions for investigating the postbuckling phenomenon. Experimental postbuckling analysis was carried out to validate the finite element analysis results and found satisfactory. The influence of imperfections with different r/t, stacking sequences with SSSS and SFSF boundary conditions were carried out and compared. As the r/t ratio of the cylindrical panel increases the postbuckling load decreases for a given boundary conditions and with magnitude of imperfection sensitivities. It has been observed that SFSF boundary conditions with angle play layup sequences taking more axial loads than SSSS boundary conditions with same layup sequence and imperfection sensitivity. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
16. 3D Nonaxisymmetric Local Stability Loss of a Hollow Cylinder Made of an Anisotropic Viscoelastic Material.
- Author
-
Akbarov, S. D., Anwar, M. Y., and Kutüg, Z.
- Subjects
- *
VISCOELASTIC materials , *COMPRESSIVE force , *NONLINEAR equations , *COMPOSITE materials , *VISCOELASTICITY - Abstract
The 3D nonaxisymmetric local stability loss problem is studied for a hollow cylinder, made of a viscoelastic composite material, under the axial compression. The criterion of an infinitesimal initial imperfection is employed, and the evolution of this imperfection is investigated by 3D geometrically nonlinear exact equations of viscoelasticity theory. The corresponding nonlinear problem is solved by the boundary perturbation method. The material of the cylinder is modeled as a viscoelastic transversely isotropic medium. Numerical results for the critical time and critical compressive forces are presented, discussed, and compared with those obtained by approximate shell theories. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
17. Experimental investigation of buckling behavior of E-glass/epoxy laminated composite materials with multi-walled carbon nanotube under uniaxial compression load.
- Author
-
Mutu, Halil Burak and Aslan, Züleyha
- Subjects
- *
COMPOSITE materials , *LAMINATED materials , *COMPRESSION loads , *MULTIWALLED carbon nanotubes , *CARBON nanotubes , *DOUBLE walled carbon nanotubes , *MECHANICAL buckling , *FIBROUS composites - Abstract
This study experimentally investigated the effects of nanoparticle reinforcement on the buckling behavior of composite materials. Different sizes of carboxylic acid functionalized multi-walled carbon nanotubes were used as nanoparticles. E-glass fiber-reinforced composite materials with polymer matrix in the [0°/90°/0°/90°]s cross-ply array with and without carbon nanotube reinforcement were produced by hand lay-up and vacuum bagging. Three types of carbon nanotubes in different sizes and proportions of 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% by weight were added to the epoxy resin. For the buckling test, the samples with two clamped and two free sides were attached to the universal testing machine to apply a uniaxial compressive load. As a result of the experiments, it was found that the addition of carbon nanotube in certain proportions increases the critical buckling load of composite materials. The highest increase in the critical buckling load (26.10% increase) was achieved with a carbon nanotube reinforcement of 0.2% by weight, having an outer diameter of 10–20 nm, internal diameter of 5–10 nm, and length of 0.5–2 mm. As the carbon nanotube sizes added to the epoxy resin decreased, the buckling strength increased. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
18. Buckling of composite cylindrical shells with ovality and thickness variation subjected to hydrostatic pressure.
- Author
-
Zhun Li, Ke-chun Shen, Xin-hu Zhang, and Guang Pan
- Subjects
COMPOSITE materials ,HYDROSTATIC pressure ,CYLINDRICAL shells ,MECHANICAL buckling ,NONLINEAR regression - Abstract
The initial geometric imperfection is one of the primary factors affecting the buckling behaviors of composite cylindrical shells under hydrostatic pressure. In this study, ovality and thickness variations as two representative types of the geometric imperfections are considered. After measuring the geometric imperfections, a typical carbon fiber reinforced polymers (CFRP) cylindrical shell is tested to obtain the buckling pressure. The buckling behaviors of the shell sample are analyzed in combination with the strain responses. By using the nonlinear numerical analysis, the buckling shapes of the CFRP cylinder shells with different combinations of ovality and thickness variation are firstly discussed. The rules of influence of such imperfections on the buckling pressure are then obtained by nonlinear regression method. Finally, an empirical formula is proposed to predict the buckling pressure of the composite cylinder shells, and the calculated results from the formula are in good agreement with the numerical results. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
19. 复合材料压力容器含凹陷内胆屈曲的 有限元分析.
- Author
-
张国, 朱海洋, 蔡雅琪, 任明法, and 李刚
- Subjects
PRESSURE vessels ,FINITE element method ,STRAINS & stresses (Mechanics) ,RESIDUAL stresses ,MODEL airplanes ,COMPOSITE construction ,COMPOSITE plates ,ALUMINUM alloys - Abstract
Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
- Full Text
- View/download PDF
20. On the Design of Composite Patch Repair for Strengthening of Marine Plates Subjected to Compressive Loads.
- Author
-
Kallitsis, Nikos and Anyfantis, Konstantinos N.
- Subjects
SHIP corrosion ,FINITE element method ,COMPOSITE materials ,COMPUTATIONAL mechanics - Abstract
Marine structures are susceptible to corrosion that accelerates material wastage. This phenomenon could lead to thickness reduction to the extent in which local buckling instabilities may occur. The majority of existing repair techniques require welding, which is a restricting factor in flammable environments where hot work is prohibited. A novel repair methodology that has attracted the research focus for over two decades is the adhesive bonding of a composite patch on a ship's damaged plating. Although most studies have been focused on patch repair against crack propagation, restoring the initial buckling strength of corroded marine plates is of high interest. In this work, this technique is assessed using numerical experimentation through finite element analysis (FEA) with the patch's dimensions as design parameters. The results are then evaluated using a design-of-experiments (DOE) approach by generating a response surface from central composite design (CCD) points. Applying this methodology to various plates and patches makes it possible to create a repair design procedure that specifies the minimum patch requirements depending on the metal substrate's dimensions and corrosion realized. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
21. Technique for assessing the probability of survival of structural members with delaminations
- Author
-
S. A. Chernyakin
- Subjects
composite materials ,reliability ,buckling ,nonlinear analysis ,delaminations ,conical bay ,Motor vehicles. Aeronautics. Astronautics ,TL1-4050 - Abstract
The paper presents a technique of quantitative assessment of probability of failure-free operation of composite structures containing an ensemble of defects in the form of delamination. This method is based on approaches of general reliability theory. The proposed method was validated relative to the assessment of reliability of a composite conical bay with multiple delaminations generated under loads at the stage of inserting the launch vehicle into orbit. The statistical dynamic problem was solved by using Monte Carlo method which was implemented by means of algorithms developed by the author in ANSYS software. Nonlinear analysis of the conical bay buckling was carried out for each implementation. Quantitative assessment of survival probability was conducted on the basis of the hypothesis of the law of Gaussian distribution of load-bearing capacity and using the graphical method of reliability calculation. Good agreement of the results obtained by both methods was noted.
- Published
- 2020
- Full Text
- View/download PDF
22. A Numerical Study on Carbon-Fiber-Reinforced Composite Cylindrical Skirts for Solid Propeller Rockets
- Author
-
Ferdinando Baldieri, Emanuele Martelli, and Aniello Riccio
- Subjects
solid propeller rocket ,space ,composite materials ,carbon-fiber-reinforced polymers (CFRP) ,buckling ,laminate strength ,Organic chemistry ,QD241-441 - Abstract
A solid rocket motor (SRM) is a rocket engine that uses a fuel/oxidizer mixture in a solid state; the most commonly employed propellants are Hydroxyl-Terminated Polybutadiene (HTPB) as the fuel and ammonium/potassium perchlorate as the oxidizer. To increase the flight range of this kind of vehicle, the weight has to be reduced as much as possible. A possible element that can be worked on is the coating of the combustion chamber: the skirt. The aim of this paper is to investigate the behavior of a cylindrical skirt subjected to internal pressure load and axial thrust and to compare the performance of a skirt made of a standard steel for aeronautics purposes with a carbon-fiber-reinforced composite skirt. The motor test case is taken from the ONERA C1xb and the flowfield is simulated with an axisymmetric k-ω turbulence model. The carbon-fiber-reinforced composite skirt is a cylindrical shell with a symmetric and balanced layup [90/0/45/−45]s. To check composite layer integrity, Hashin’s failure criteria were adopted while linearized buckling methods were used to assess the buckling behavior of the skirt. The composite layup was modeled by adopting the classical laminate theory.
- Published
- 2023
- Full Text
- View/download PDF
23. The Influence of Composite Lay-Up on the Stability of a Structure with Closed Section.
- Author
-
Rózyło, Patryk and Debski, Hubert
- Subjects
STRUCTURAL stability ,FINITE element method ,COMPOSITE structures ,COMPOSITE materials - Abstract
This paper presents a study on the stability of a composite structure with a closed section. The research was carried out solely based on numerical simulations using the finite element method. ABAQUS software was used to conduct numerical simulations, which allowed to determine the values of critical loads, as well as the corresponding forms of buckling. As part of the research, the influence of composite material arrangement of layers on the stability of the structure was analyzed. The study was conducted on a composite material, which is a carbon-epoxy composite (CFRP). The obtained research results will be verified in subsequent studies by the results of experimental tests. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
24. 基于精确板理论的复合材料格栅/波纹夹芯 结构屈曲特性.
- Author
-
朱秀杰, 郑坚, 熊超, 殷军辉, 邓辉咏, and 邹有纯
- Subjects
SANDWICH construction (Materials) ,SHEAR (Mechanics) ,IRON & steel plates ,POTENTIAL energy ,DIFFERENTIAL equations ,COMPOSITE plates ,ELASTIC constants - Abstract
Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
- Full Text
- View/download PDF
25. Stability of fixed-fixed shallow arches under arbitrary radial and vertical forces
- Author
-
L.P. Kiss
- Subjects
buckling ,stiffness ,strength ,design ,composite materials ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Building construction ,TH1-9745 - Abstract
In the present paper the planar stability of fixed-fixed shallow circular arches is investigated. The arches are made of linearly elastic, functionally graded material and are subject to a concentrated radial or vertical dead force at an arbitrary position. To describe the behaviour, the one-dimensional Euler-Bernoulli kinematic hypothesis is used. The effect of the bending moment on the membrane strain is incorporated into the model. The related coupled differential equations of the problem are derived from the principle of virtual work. Exact solutions are found both for the pre- and post-bucking displacements. Closed-form analytical solution is given for the buckling load when the load is radial while for vertical force, the solution is numerical. It is found that for fixed-fixed members, only limit point buckling is possible. Such shallow arches are not sensitive to small imperfections in the load position or in the load direction. It turns out that the material behaviour and geometry have significant effects on the behaviour and buckling load. If the load is placed far enough from the crown point, the load bearing abilities become better than for crown-load. Comparisons with an analytical literature model and commercial finite element software confirm the validity of the new findings.
- Published
- 2020
- Full Text
- View/download PDF
26. Experimental Investigation of Instabilities on Different Scales in Compressive Fatigue Testing of Composites.
- Author
-
Baumann, Andreas and Hausmann, Joachim
- Subjects
COMPOSITE materials ,COMPRESSIVE strength ,FIBROUS composites ,POLYAMIDES ,MECHANICAL buckling - Abstract
Compression testing of continuous fiber reinforced materials is challenging, because a great number of competing failure modes and instabilities on different length scales have to be considered. In comparison to tensile testing, the results are more affected by the chosen test set-up. Effects introduced by the test set-up as well as the type of damage in continuous fiber reinforced materials are mainly investigated for quasi-static loading. This is not the case for cyclic compression loading. Neither standardized methods nor a great deal of literature for reference exists. The aim of this work is to increase the understanding by analyzing the potential effects the set-up in fatigue loading might have on the damage for two common testing strategies by fatigue tests, load increase creep tests and supplementary analytical models. The results show that damage modes can be altered by the testing strategy for the investigated woven glass fiber reinforced polyamide 6. The tools both experimentally and analytically provide the basis to choose the correct set-up in future investigations. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
27. Stability and load carrying capacity of thin-walled composite columns with square cross-section under axial compression.
- Author
-
Rozylo, Patryk and Debski, Hubert
- Subjects
- *
COMPOSITE columns , *ACOUSTIC emission , *MATERIALS testing , *FINITE element method , *COMPOSITE structures , *COMPOSITE materials , *DEFORMATION of surfaces - Abstract
The study aimed to analyse the stability and load-carrying capacity of compressed thin-walled composite columns subjected to axial compression. The subject of the survey was composite columns with closed square cross-sections made of carbon-epoxy composite. Different lay-ups of the composite material characterised the test specimens - several cases of lay-ups were considered. The application of the subject of the research is closely related to the use of these elements as load-carrying elements of aerospace and building structures. The requirements for such structures are closely related to the provision of a large reserve of load-carrying capacity after buckling. Experimental testing was carried out using a universal testing machine and other testing techniques, where acoustic emission, an optical deformation measurement system, and a digital microscope, among others, were used. Numerical simulations using the finite element method were carried out parallel to the experimental studies. In the case of FEA simulations, original numerical models were developed considering known failure models of the composite material. For both empirical studies and FEM simulations, an in-depth analysis of the buckling and post-buckling states was carried out, considering the failure phase of the composite material. The novelty of the present work was the development of original FEM models, allowing faithful reproduction of experimental studies conducted on physical models, as well as the use of research methods to determine the load-carrying capacity of composite structures. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
28. How to Join Fiber-Reinforced Composite Parts: An Experimental Investigation
- Author
-
Dong, Yaomin, Mazzei, Arnaldo, Baqersad, Javad, Sheidaei, Azadeh, Cloud, Gary L., editor, Patterson, Eann, editor, and Backman, David, editor
- Published
- 2017
- Full Text
- View/download PDF
29. Nonlinear elastic buckling of ultra-thin coilable booms.
- Author
-
Leclerc, Christophe and Pellegrino, Sergio
- Subjects
- *
MECHANICAL buckling , *MANUFACTURING processes , *FLANGES - Abstract
This paper presents a study of the elastic buckling behavior of Triangular Rollable And Collapsible (TRAC) booms under pure bending. An autoclave manufacturing process for ultra-thin composite booms is presented and the behavior of three test samples is investigated experimentally. Two regimes are observed, a pre-buckling regime and a stable post-buckling regime that ends when buckling collapse is reached. The buckling collapse moment, marking the end of the stable post-buckling regime, is typically four times higher than the initial buckling moment. A numerical simulation of the boom behavior with the Abaqus finite element package is presented and all of the features observed experimentally are captured accurately by the simulation, except buckling collapse. The numerical model is also used to study the effect of varying the boom length from 0.3 m to 5.0 m. It is shown that the pre-buckling deformation of the flanges under compression leads to a constant wavelength lateral-torsional buckling mode for which the critical moment is mostly constant across the range of lengths. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
30. 基于连续损伤模型的复合材料波纹梁压溃分析.
- Author
-
蔡彤辉, 王新峰, 崔 浩, and 毕世权
- Subjects
- *
COMPOSITE construction , *FAILURE mode & effects analysis , *COMPOSITE materials , *DAMAGE models , *LAMINATED composite beams , *STRENGTH of materials , *MECHANICAL buckling - Abstract
The impact resistance of composite materials has been widely valued, and corrugated beams are widely used in aircraft spar and helicopter floor structures that often collide due to their excellent bucklingresistant configuration. The buckling analysis of corrugated composite beams is performed, and the effect of height on the failure mode of corrugated beams is studied. A single-wave continuous damage model for composite corrugated beams is established. The damage stiffness matrix with damage factors is established in the layers based on the Hashin criterion. The damage evolution is simulated between the layers according to the quadratic nominal stress criterion and B-K criterion. The burst test verifies the correctness of the model. Based on the single-wave analysis model, the energy absorption characteristics of multi-wave structures are studied by applying periodic boundary conditions and antisymmetric boundary conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
31. Behavior of Concrete Sandwich Panels under Eccentric Axial Compression-Testing and Finite Element Analysis.
- Author
-
Qian Huang, Hamed, Ehab, and Gilbert, R. Ian
- Subjects
SANDWICH construction (Materials) ,CONCRETE panels ,FINITE element method ,PRECAST concrete ,COMPOSITE materials ,REINFORCING bars ,COLUMN design & construction - Abstract
The structural behavior of precast concrete sandwich panels made with fiber-reinforced polymer (FRP) diagonal-bar connectors is investigated in this paper. The results of two series of tests are reported. The first test includes full-scale concrete sandwich panels under four-point bending, and the second describes the response of panels under eccentric axial compression. The panels subjected to bending exhibited a very ductile response, with a typically flexural failure characterized by yielding of the steel reinforcement. The axially loaded panels failed due to buckling characterized by a limit-point mode, and their strength was very close to that of a solid reinforced concrete (RC) panel of the same dimensions. The experimental investigation highlights the effects of the diameter of the FRP diagonal bars, insulation type, load eccentricity, and other parameters. The experimental results are compared to predictions obtained from a finite element model that was previously developed by the authors. Good correlation was obtained between the experimental and numerical results. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
32. Effect of a Composite Coupler on Automotive Windshield Wiper System Chatter
- Author
-
Dong, Yaomin, Zimmerman, Kristin B, Series editor, Ralph, Carter, editor, Silberstein, Meredith, editor, Thakre, Piyush R., editor, and Singh, Raman, editor
- Published
- 2016
- Full Text
- View/download PDF
33. Experimental study on buckling behavior of composite cylindrical shells with and without circular holes under hydrostatic pressure.
- Author
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Wei, Ranfeng, Shen, Kechun, Pan, Guang, and Li, Zhun
- Subjects
- *
CYLINDRICAL shells , *SUBMERSIBLES , *INFORMATION design , *MECHANICAL buckling , *CRITICAL point (Thermodynamics) , *COMPOSITE materials , *HYDROSTATIC pressure - Abstract
Composite materials have been widely used in the field of pressure shells for underwater vehicles due to their great potential. This paper presents an experimental study of composite cylindrical shells with and without the circular hole subjected to external hydrostatic pressure. The mechanical response of the composite cylindrical shells under external hydrostatic pressure is recorded by the strain acquisition system, and the buckling deformation process of the shells is also captured by the high-speed camera system. According to the experimental results, the entire compression process of the shell can be divided into three stages based on variations in strain. Based on the findings that buckling starts very early and accounts for about 35 % of the entire process, the concept of initial buckling pressure is proposed to distinguish the critical point of the shell transition from a stable state to an unstable state. It is found that the damage positions of the three shells all correspond to the troughs in the buckling waveform, and the final fiber breakage of the perforated shells with the reinforcements both occur near the reinforcement component. Finally, a comparative analysis of the strain response of the shell with the hole and the complete shell is carried out to explore their similarities and differences. The experimental results in this paper provide valuable information for the design of perforated composite pressure shells for underwater vehicles. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
34. Parametric Optimization of Isotropic and Composite Axially Symmetric Shells Subjected to External Pressure and Twisting
- Author
-
Marek Barski, Paweł J. Romanowicz, Małgorzata Chwał, and Adam Stawiarski
- Subjects
axially symmetric shells ,buckling ,parametric optimization ,external pressure ,twisting ,composite materials ,Technology ,Science - Abstract
The present paper is devoted to the problem of the optimal design of thin-walled composite axially symmetric shells with respect to buckling resistance. The optimization problem is formulated with the following constraints: namely, all analyzed shells have identical capacity and volume of material. The optimization procedure consists of four steps. In the first step, the initial calculations are made for cylindrical shells with non-optimal orientation of layers and these results are used as the reference for optimization. Next, the optimal orientations of layers for cylindrical shapes are determined. In the third step, the optimal geometrical shape of a middle surface with a constant thickness is determined for isotropic material. Finally, for the assumed shape of the middle surface, the optimal fiber orientation angle θ of the composite shell is appointed. Such studies were carried for three cases: pure external pressure, pure twisting, and combined external pressure with twisting. In the case of shells made of isotropic material the obtained results are compared with the optimal structure of uniform stability, where the analytical Shirshov’s local stability condition is utilized. In the case of structures made of composite materials, the computations are carried out for two different materials, where the ratio of E1/E2 is equal to 17.573 and 3.415. The obtained benefit from optimization, measured as the ratio of critical load multiplier computed for reference shell and optimal structure, is significant. Finally, the optimal geometrical shapes and orientations of the layers for the assumed loadings is proposed.
- Published
- 2021
- Full Text
- View/download PDF
35. Buckling behavior of wind turbine blade
- Author
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H. Ounis and A. Balehouane
- Subjects
wind turbine blade ,spar cap ,composite materials ,cylindrical shell ,buckling ,Renewable energy sources ,TJ807-830 - Abstract
The use of composite materials is growing up compared to the traditional materials, in basically all the industrial domains, where we need powerful, lightweight and cost effective structures. An example of a challenging lightweight structure made of composite materials are wind turbine blades. Indeed, the modern wind turbine blades are becoming dramatically bigger, and nowadays a length of a standard one is over 60 m. The wind turbine blades are often facing extremely complex loads due to environmental conditions they are working in. One of the main loading acting on the wind turbine bale are pressure load, which can engender flap wise and edgewise bending. On the other hand, the consequence of optimum design strategy, the wind turbine blades are becoming thin-walled structures, which raise the risk of buckling phenomena. Therefore, the understanding of the wind turbine blade behaviour under this kind of aforementioned load is very crucial. In this study, the buckling behaviour of the spar cap of a wind turbine blade using the finite element method is investigated. For so doing, a generic NACA 634- 421 airfoil section is considered. The spar cap is taken as a multilayer curved cylindrical shell. A parametric study is made in order to study the effect of material choice, stacking sequence and number of layers on the buckling resistance of the spar cap. The results showed that the buckling load is very sensitive to the considered parameters.
- Published
- 2016
36. Numerical identification of constitutive parameters in reduced-order bi-dimensional models for pantographic structures: application to out-of-plane buckling.
- Author
-
De Angelo, Michele, Barchiesi, Emilio, Giorgio, Ivan, and Abali, B. Emek
- Subjects
- *
REDUCED-order models , *PARAMETER identification , *MECHANICAL buckling , *SPACE robotics , *NUMERICAL analysis , *COMPOSITE materials - Abstract
Mechanical properties are investigated for a class of microstructured materials with promising applications. Specifically, we consider a composite material with orthogonal, mutually interconnected fibers building a pantographic substructure. In order to predict the behavior of such a system in three-dimensional continuum, a reduced-order model is introduced by means of a bi-dimensional elastic surface accurately describing large deformations. The properties of this reduced-order model are characterized by an elastic energy density that involves second space derivatives of the displacement for capturing the resistance of twisted and bent fibers in plane as well as out of plane. For determining the coefficients in the elastic energy of the reduced-order model, we utilize a numerical inverse analysis and make use of ad hoc computational experiments performed by a direct numerical simulation on the microscale with detailed modeling of the pantographic substructure. This reduced-order model represents a homogenized material on macro-scale with its substructure on microscale. The homogenized model is capable of describing materials response at a significantly less computational cost than the direct numerical simulations. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
37. Numerical models for buckling, postbuckling and failure analysis of pre-damaged thin-walled composite struts subjected to uniform compression.
- Author
-
Debski, H., Rozylo, P., Gliszczynski, A., and Kubiak, T.
- Subjects
- *
MECHANICAL buckling , *COMPOSITE plates , *FAILURE analysis , *DAMAGE models , *FINITE element method , *STRUCTURAL stability , *COMPOSITE materials - Abstract
Abstract The paper investigates the stability and post-buckling states of compressed thin-walled composite struts with predamage as a result of low-velocity impact. The struts were made of a GFRP composite material with a symmetrical lay-up by the autoclave technique. The produced channel-section struts were subjected to 20 J impact in different areas of the structure: on the web and on the flange. The struts with composite damage were subjected to axial compression to investigate the effect of composite material damage on the stability and operation of the structure in the post-buckling range. A numerical analysis was performed by the finite element method to compare two models of composite material damage: the proposed Simplified Damage Model (SDM) and the model developed by Fardin Esrail and Christos Kassapoglou. The limit load when the structure loses its stability was determined by the progressive failure criterion, according to which damage initiation in the composite material is based on the Hashin criterion while damage evolution is described with the energy criterion. Highlights • Investigation of low velocity impact influence on stability and collapse of struts. • Two damage models were used (SDM – own study and EKM) in FEM analysis. • The numerical models were verified in experimental tests. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
38. Parametric study on the buckling load after micro-bolt repair of a composite laminate with delamination.
- Author
-
Kang, Gyu-Seok, Kwak, Byeong-Su, Choe, Hyeon-Seok, and Kweon, Jin-Hwe
- Subjects
- *
MECHANICAL buckling , *MECHANICAL loads , *COMPOSITE materials , *DELAMINATION of composite materials , *MECHANICAL behavior of materials - Abstract
Abstract Repair of a composite laminate with delamination using micro-bolts is studied parametrically. The effects on compressive buckling load of delamination crack length, bolt material, bolt diameter and arrangement, and bolt–laminate clearance are considered. For 45- and 65-mm crack lengths, buckling load recovery rates using brass bolts are 90% and 73%, respectively. Using steel increases the rate by 6.6% compared to the intact specimen. Tests are performed fixing the number of steel bolts for bolt diameters of 0.6, 1.0, and 1.2 mm. The buckling load recovery rate using 1.2- versus 0.6-mm bolts increases by 6.8%. Finite element analysis confirms the effect of the bolt–laminate gap: 27% larger buckling load for no clearance than for a 0.1-mm gap. 18% higher buckling load, which is 97% of intact-specimen buckling load, is obtained for a 1.2-mm-diameter bolt repair by gluing bolts and holes and then tightening them compared with using bolts alone. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
39. Propagation of pop ups in kirigami shells.
- Author
-
Rafsanjani, Ahmad, Jina, Lishuai, Deng, Bolei, and Bertoldi, Katia
- Subjects
- *
METAMATERIALS , *COMPOSITE materials , *ELASTIC wave propagation , *FINITE element method , *NANOPARTICLES - Abstract
Kirigami-inspired metamaterials are attracting increasing interest because of their ability to achieve extremely large strains and shape changes via out-of-plane buckling. While in flat kirigami sheets, the ligaments buckle simultaneously as Euler columns, leading to a continuous phase transition; here, we demonstrate that kirigami shells can also support discontinuous phase transitions. Specifically, we show via a combination of experiments, numerical simulations, and theoretical analysis that, in cylindrical kirigami shells, the snapping-induced curvature inversion of the initially bent ligaments results in a pop-up process that first localizes near an imperfection and then, as the deformation is increased, progressively spreads through the structure. Notably, we find that the width of the transition zone as well as the stress at which propagation of the instability is triggered can be controlled by carefully selecting the geometry of the cuts and the curvature of the shell. Our study significantly expands the ability of existing kirigami metamaterials and opens avenues for the design of the next generation of responsive surfaces as demonstrated by the design of a smart skin that significantly enhances the crawling efficiency of a simple linear actuator. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
40. The behaviour of compressed plate with a central cut-out, made of composite in an asymmetrical arrangement of layers.
- Author
-
Falkowicz, Katarzyna, Dębski, Hubert, Wysmulski, Paweł, and Różyło, Patryk
- Subjects
- *
EPOXY resins , *COMPOSITE materials , *STIFFNESS (Engineering) , *MECHANICAL buckling , *COMPRESSION loads - Abstract
Abstract The study investigated thin carbon/epoxy composite plate elements with a central cut-out of regular shape, under uniform compression. The aim of the study was to investigate the possibility of using these elements as elastic elements whose stiffness depends on tailoring the cut-out geometry and laminate ply orientation. To ensure stable operation of the structure in the postbuckling range, the plate was assigned the properties of an unsymmetrical lay-up with extension-twisting and extension-bending couplings. The structure was analysed numerically by the finite element method. The scope of numerical simulations included linear analysis of an eigen problem using procedures for geometrically nonlinear analysis and the commercial simulation software ABAQUS®. The aim of the analysis was to determine a laminate ply orientation generating the lowest buckling mode (flexural-torsional) in order to ensure stable operation of the structure in the postbuckling range. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
41. The influence of load eccentricity on the behavior of thin-walled compressed composite structures.
- Author
-
Wysmulski, P., Debski, H., Falkowicz, K., and Rozylo, P.
- Subjects
- *
ECCENTRIC loads , *COMPOSITE materials , *MECHANICAL loads , *COMPRESSION loads , *STRAINS & stresses (Mechanics) - Abstract
Abstract The study investigates the effect of eccentric load on the stability and postcritical states of thin-walled CFRP channel section columns under compression. Test specimens are subjected to compression on a testing machine provided with a fixture for applying eccentric compressive loads. Loading forces, deflection and strains of the column walls and web are measured. The experiments also involve examination of the operating performance of a structure undergoing buckling and determination of its postcritical equilibrium paths describing the relationship between load and deflection. Based on experimental results, numerical models of composite structures are designed and verified by the FEM. The scope of the numerical analysis involves performing a linear analysis of stability, which allows for determining the buckling mode depending on the amplitude of compressive load eccentricity and corresponding critical loads. The next stage of the analysis involves performing a nonlinear analysis of the structures with implemented geometric imperfections reflecting the lowest buckling modes. Based on obtained results, postcritical equilibrium paths of the developed FEM models are determined. Obtained equilibrium paths are then compared with experimental characteristics of real structures. The numerical results and experimental findings show a satisfactory agreement. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
42. Compressive strength of flax fibre bundles within the stem and comparison with unidirectional flax/epoxy composites.
- Author
-
Baley, Christophe, Goudenhooft, Camille, Perré, Patrick, Lu, Pin, Pierre, Floran, and Bourmaud, Alain
- Subjects
- *
FLAX , *PLANT fibers , *COMPRESSIVE strength , *COMPOSITE materials testing , *EPOXY resins , *MECHANICAL buckling , *SCANNING electron microscopy - Abstract
Highlights • Compressive properties of flax bundles within stems and composites are studied. • Similar compressive strength values are estimated for these types of materials. • Damage mechanisms are similar within stems and flax-based unidirectional materials. • The flax variety and its fiber yield influence the stem compressive properties. Abstract Flax (Linum usitatissimum L.) fibres are commonly used as reinforcement of composite materials. Nevertheless, literature shows that the compressive strength of flax-based composites is rather modest compared with materials reinforced by synthetic fibres. The present article investigates the compressive strength of flax fibre bundles both within the stems and in unidirectional (UD) composites. In this way, an optimised arrangement of fibre bundles inside the plant is assumed. Damage mechanisms are found to be similar in the stem and within flax-based UD materials, namely by buckling of fibre bundles, a typical failure mechanism of UD composites. Inside the stems, this phenomenon is highlighted by nanotomography, which underlines the key role of the woody core in the buckling resistance of the plant. For UD, failure can also be studied by scanning electron microscopy (SEM). The same ranges of average compressive strength values are estimated for flax fibre bundles, being 206 MPa within the stem and 242 MPa within UD composites. Finally, this study highlights that, if a flax stem is an optimised natural structure, the compressive strength of flax fibre bundles seems to be a limiting factor for structural applications of flax-based composite materials. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
43. A novel design method for the fast and cost-effective manufacture of composite parts employing the Quilted Stratum Process.
- Author
-
Irisarri, F.X., Macquart, T., Julien, C., and Espinassou, D.
- Subjects
- *
CARBON fiber-reinforced plastics , *COMPOSITE materials , *THERMOPLASTIC composites , *STIFFNESS (Mechanics) , *AEROSPACE engineering - Abstract
Abstract Composite materials, and carbon fiber reinforced plastics (CFRP) in particular, are nowadays widely used in the design of high performance aeronautical and aerospace lightweight structures. Applications to other sectors have, however, been limited due to their high costs and long processing times. To address these issues, the CETIM has developed the Quilted Stratum Process (QSP); a fully automated high-volume production line of thermoplastic composite parts. The QSP manufactures variable-thickness and variable-stiffness composite laminates by assembling composite layers of various orientations and shapes. The focus of this work is to bring together the great versatility of composite design offered by the QSP under a single coherent framework, automating and simplifying the design of QSP-manufactured structures. To this end, we develop the Quilted Stratum Design (QSD). The QSD is a three-step laminate optimization procedure during which the structure is first ideally optimized, then simplified and finally detailed layer by layer to be interpreted for QSP-manufacturing. The method is presented in this paper and applied to both an academic and an industrial case study for which the trade-off between the manufacturing complexity and mechanical performances is studied. In both our applications, partitioning the structure into small numbers of constant stiffness areas was found to be sufficient to significantly over-perform conventional constant stiffness designs and well-compatible with the QSP. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
44. Buckling of stomatopod-dactyl-club-inspired functional gradient plates: A numerical study.
- Author
-
Liu, Peng, Duan, Huigao, Lich, Le Van, Ye, Tuo, and Bui, Tinh Quoc
- Subjects
- *
MECHANICAL buckling , *SYNTHETIC fibers , *MECHANICAL behavior of materials , *FUNCTIONALLY gradient materials , *COMPOSITE materials - Abstract
Abstract The translation of natural (or biological) structures into synthetic materials offers a spectrum of feasible pathways towards enhanced or even unprecedented material properties for a wide range of applications. Inspired by excellent mechanical properties of stomatopod dactyl club, herein we propose a new functionally graded material (FGM) model that can adequately describe the characteristics of hierarchical structures in the stomatopod dactyl club. The proposed FGM model is incorporated into extended finite element method with stabilized discrete shear gap to investigate the mechanical buckling behavior of the plate made of materials similar with that in stomatopod dactyl club. The critical buckling factors for cracked FGM plates are computed and analyzed. Numerical results show that the design motif of bioinspired FGM increases the normalized buckling factor, even higher than that of homogenous plates, which suggests that the stability of plates can be enhanced by the use of bioinpsired FGM. The proposed FGM model opens a broad avenue to explore more fascinating mechanical properties of hierarchical gradient materials inspired by stomatopod dactyl club. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
45. Buckling of Magnetically Formed Filler Fiber Columns Under Compression Increases Thermal Resistance of Soft Polymer Composites.
- Author
-
Ralphs, Matthew, Scheitlin, Chandler, Wang, Robert Y., and Rykaczewski, Konrad
- Subjects
- *
POLYMERIC composites , *FIBERS , *COMPRESSION loads - Abstract
Thermally conductive soft composites are in high demand, and aligning the fill material is a potential method of enhancing their thermal performance. In particular, magnetic alignment of nickel particles has previously been demonstrated as an easy and effective way to improve directional thermal conductivity of such composites. However, the effect of compression on the thermal performance of these materials has not yet been investigated. This work investigates the thermal performance of magnetically aligned nickel fibers in a soft polymer matrix under compression. The fibers orient themselves in the direction of the applied magnetic field and align into columns, resulting in a 3× increase in directional thermal conductivity over unaligned composites at a volume fraction of 0.15. Nevertheless, these aligned fiber columns buckle under strain resulting in an increase in the composite thermal resistance. These results highlight potential pitfalls of magnetic filler alignment when designing soft composites for applications where strain is expected such as thermal management of electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
46. Bending, buckling and vibration analyses of MSGT microcomposite circular-annular sandwich plate under hydro-thermo-magneto-mechanical loadings using DQM.
- Author
-
Mohammadimehr, M., Emdadi, M., Afshari, H., and Rousta Navi, B.
- Subjects
- *
COMPOSITE materials , *MECHANICAL buckling , *DIFFERENTIAL quadrature method , *BENDING (Metalwork) , *VIBRATION (Mechanics) , *STRUCTURAL plates - Abstract
The purpose of this paper is to investigate the bending, buckling, vibration analyses of microcomposite circular-annular sandwich plate with CNT reinforced composite facesheets under hydro-thermo-magneto-mechanical loadings are presented using first order shear deformation theory (FSDT) and modified strain gradient theory (MSGT) that includes three material length scale parameters. Also, an isotropic homogeneous core is considered for microcomposite circular-annular sandwich plate. The generalized rule of mixture is employed to predict mechanical, moisture and thermal properties of microcomposite sandwich plate. By using Hamilton’s principle, governing equations are solved by differential quadrature method (DQM) for a circular annular sandwich plate. The predicted results are validated by carrying out the comparison studies for the FGM plates by modified couple stress theory (MCST). The obtained results are given to indicate the influence of the material length scale parameter, core- to-facesheet thickness ratios, magnetic effect, thermal and moisture effects on the dimensionless deflection, critical buckling load, and natural frequency of microcomposite circular sandwich plate. The results can be employed in solid-state physics, materials science, nano-electronics, and nano electro-mechanical devices such as microactuators, and microsensor. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
47. Biaxial and shear buckling of laminated composite elliptic paraboloids with cutouts and concentrated mass.
- Author
-
Chaubey, Abhay K., Prakash, Chandra, and Kumar, Ajay
- Subjects
- *
MECHANICAL buckling , *COMPOSITE materials , *AXIAL loads , *FINITE element method , *PARABOLOID , *LAMINATED materials - Abstract
Highlights • A new FE model developed by authors is used to study biaxial and shear buckling analysis of laminated elliptic paraboloids. • There is no result of the buckling analysis of laminated composite elliptic paraboloids with cutouts and concentrated mass. • The parabolic variation of transverse shear strain is considered hence no shear correction factor is required. • A C° FE coding in FORTRAN is developed to generate many new results for different parameters. • Many new results are presented in this paper which may be useful for further research. Abstract The buckling of laminated elliptic paraboloids with cutouts and concentrated mass subjected to the in-plane bi-axial and the shear load is investigated for various boundary conditions using present mathematical model. Transverse shear stresses are represented by a parabolic function across the thickness and the cross curvature effect is also included via strain relations. The transverse shear stresses free condition at the shell top and bottom surfaces are also satisfied. In this mathematical model having a realistic parabolic distribution of transverse shear strains across the thickness of shell requires unknown parameters only at the reference plane. For generality in the present analysis, nine node curved isoparametric element is used. So far, no solution exists in the literature for dual axis buckling problem of laminated composite elliptic paraboloids with cutouts and concentrated mass. As no result is available for the present problem, the present model is compared with suitable published results and then it is extended to analyze bi-axial and shear buckling of laminated composite elliptic paraboloids. A C° finite element (FE) coding in FORTRAN is developed to generate many new results for different boundary conditions, lamination schemes etc. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
48. Nonlinear in-plane instability of functionally graded multilayer graphene reinforced composite shallow arches.
- Author
-
Yang, Zhicheng, Yang, Jie, Liu, Airong, and Fu, Jiyang
- Subjects
- *
FUNCTIONALLY gradient materials , *GRAPHENE , *COMPOSITE materials , *SHALLOW foundations , *ARCHES , *NONLINEAR analysis - Abstract
Abstract This paper investigates the in-plane instability of functionally graded multilayer composite shallow arches reinforced with a low content of graphene platelets (GPLs) under a central point load. The GPL weight fraction, which is a constant within each individual GPL reinforced composite (GPLRC) layer, follows a layer-wise variation along the thickness direction. The effective Young' modulus of the GPLRC is estimated by modified Halpin-Tsai micromechanics model. The virtual work principle is used to establish the nonlinear equilibrium equations for the FG-GPLRC arch fixed or pinned at both ends which are then solved analytically. A parametric study is conducted to examine the effects of distribution pattern, weight fraction, and size of GPL nanofillers and the geometrical parameters of the FG-GPLRC arch on its buckling and postbuckling behaviors. The conditions for multiple limit point buckling to occur in an FG-GPLRC pinned arch are also discussed. It is found that GPL nanofillers have a remarkable reinforcing effect on buckling and postbuckling performances of nanocomposite shallow arches. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
49. Transition from buckling to progressive failure during quasi-static in-plane crushing of CF/EP composite sandwich panels.
- Author
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Chen, Yuan, Ye, Lin, Fu, Kunkun, and Han, Xu
- Subjects
- *
FAILURE analysis , *QUASISTATIC processes , *COMPOSITE materials , *SANDWICH construction (Materials) , *NUMERICAL analysis - Abstract
Abstract Global buckling failure should be avoided when designing a structure with the requirement of crashworthiness performance. This study characterises the quasi-static in-plane crushing of CF/EP composite sandwich panels by tailoring their bevel angles. A finite element model was developed describing the interlaminar and intralaminar damage of a composite sandwich panel; this model was validated by in-plane compression experiments. A numerical analysis and compression experiments were then performed to determine the responses and failure modes in the CF/EP composite sandwich panels with various bevel angles. The results showed that the global buckling-to-progressive failure transition under compression occurred in the composite sandwich panels when the bevel angle reached a critical value. A microscopic analysis showed that the composite sandwich panels with buckling failure behaviours exhibited an apparently classical post-buckling transverse shearing mode, while those with progressive failure presented individual lamina bending with inward and outward fronds. This study provides some useful data for the design of the crashworthiness of a sandwich composite panel by introducing a progressive failure mode. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
50. Remarks on experimental and theoretical investigations of buckling loads for laminated plated and shell structures.
- Author
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Muc, A., Chwał, M., and Barski, M.
- Subjects
- *
MECHANICAL buckling , *MECHANICAL loads , *COMPOSITE materials , *LAMINATED materials , *LITERATURE reviews - Abstract
Abstract The present paper deals with the description of the stability loss and postbuckling for multilayered composite structures. Both, the experimental results and theoretical predictions are presented and discussed. The wide literature review is also pointed out considering the issue of both experimental and theoretical buckling analyses for composite rectangular plates and shells. A special attention is focused on the buckling and postbuckling behaviour od structures with cutouts and reinforcement. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
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