7,179 results on '"Adhesive Bonding"'
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2. Enhanced adhesion properties of hyperelastic adhesives to different nature substrates by applying different surface treatments
- Author
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Cuadrado-Sempere, Óscar, Simón-Portillo, Francisco-Javier, Ruzafa-Silvestre, Carlos, Orgiles-Calpena, Elena, Arán-Aís, Francisca, Martins da Silva, Lucas Filipe, and Sánchez-Lozano, Miguel
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- 2025
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Catalog
3. Unilateral and bilateral adhesively bonded joints between Fe-SMA and steel for structural reinforcements
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Qiang, Xuhong, Duan, Xinran, Jiang, Xu, Zhou, Mukai, and Xiao, Fei
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- 2025
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4. Experimental and numerical analysis of mixed mode bending of adhesive-bonded and hybrid honeycomb core sandwich structures
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Kumar, A., Saikia, P.J., Narayanan, R.Ganesh, and Muthu, N.
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- 2025
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5. Enhanced interfacial bonding strength in K-300 adhesive joint between aluminum alloy and mild steel substrates through effective resin precoating treatment
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Pragathi, P., Jenison, S. Jeba, Vijayan, K. Ashoka, Singh, G. Raja, Govindarajan, K.V., Sarathi, R., and Velmurugan, R.
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- 2024
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6. Development of Test Method for Fatigue Crack Growth using DCB Specimens with Thick Adhesive Bondline
- Author
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Kumar, Rahul Iyer and De Waele, Wim
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- 2024
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7. Experimental and Numerical Study for the Optimization of Process Parameters in Laser Welded and Adhesively Bonded PBT GF30 Fillet Joints
- Author
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Silva, Luiz R. R., Marques, Eduardo A. S., Carbas, Ricardo J. C., da Silva, Lucas F. M., da Silva, Lucas F. M., Series Editor, Ferreira, António J. M., Series Editor, Adams, Robert D., editor, Sato, Chiaki, editor, and Dilger, Klaus, editor more...
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- 2025
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8. Analyzing the Vibration Response of Adhesively Bonded Composite Cantilevers.
- Author
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Chełmecki, Jarosław, Szeptyński, Paweł, Jasińska, Dorota, and Kwiecień, Arkadiusz
- Abstract
In this study, we investigated the vibration of adhesively bonded composite cantilevers consisting of two beech wood lamella and a bondline of flexible polyurethane. The beams had a constant total height, while the thickness of the adhesive layer varied. We analyzed both the driven and free vibration of a single cantilever beam and a cantilever with an additional mass attached to its end. The eigenfrequencies were determined using Fourier analysis of a sweep load response, the response to an impact load excited using an impact hammer, and the response observed via the manual displacement of the beam's tip. The system's damping was estimated according to the recorded logarithmic decrement. Theoretical estimates of the fundamental natural frequency were obtained using the γ-method and employing a linear elastic theory of composite beams. A numerical modal analysis was carried out using the finite element method. Upon comparing the results of our experiments with the numerical estimates and theoretical predictions, a fair agreement was found. [ABSTRACT FROM AUTHOR] more...
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- 2025
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9. Step and scarf joint elastic and failure behavior comparison under tensile and flexural loading.
- Author
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Kim, Garam, Kulkarni, Swapneel, Lee, Harry, and Denos, Benjamin
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DIGITAL image correlation , *TENSILE strength , *FIBROUS composites , *ULTIMATE strength , *FLEXURAL strength , *ADHESIVE joints , *LAMINATED materials - Abstract
Step and scarf joints are the two most commonly used joint types in composite laminate bonding, offering distinct characteristics and behavior in response to specific loading conditions. In order to gain a comprehensive understanding of the mechanical behavior step and scarf joints, a comparative study of adhesive bonded step and scarf joint carbon fiber reinforced composite laminate under tensile and flexural loading condition was performed. The test specimens were fabricated with carbon fiber reinforced composite laminate. The step and scarf joints were precisely manufactured using a precise milling machine, and the joints were bonded with an epoxy adhesive with controlled bondline thickness. To assess the behavior of the bonded joint structure under various loading scenarios, both tensile and four-point bending flexural tests were performed. Strain measurement during these tests was carried out using digital image correlation (DIC) technology. The step joint showed multiple sequential bondline crack propagations while the scarf joint experienced a single catastrophic failure. The test result showed that the step joint retained 10% and the scarf joint retained 32% of tensile strength compared to the no-joint test specimen. Also, the step joint retained 13% and the scarf joint retained 44% of flexural strength compared to the no-joint test specimen. As a result, the scarf joint had significantly higher ultimate tensile strength, tensile modulus, and tensile strain at failure. The scarf joint also showed higher ultimate flexural strength and flexural modulus compared to the step joint. [ABSTRACT FROM AUTHOR] more...
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- 2025
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10. Evaluation of surface pretreatment methods on thin austenitic stainless steel foils for adhesive bonding applications.
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Beier, Christoph J. A., Heym, Maximilian K., Ginster, Vinzenz, Schiebahn, Alexander, and Reisgen, Uwe
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SURFACE cleaning , *SURFACE finishing , *SURFACE preparation , *SURFACE energy , *CONTACT angle - Abstract
Stainless steel is used across all industries, from the chemical or construction sector to household appliances. To produce load bearing joints, a surface treatment of the passive surface of austenitic stainless steel is generally necessary. However, the treatment of thin-walled foil materials inhibits challenges concerning the deformation under thermal loads. This work investigates the effectiveness and mechanisms of different surface treatments on 50 µm thin AISI 316 L steel foil. Basic cleaning, surface finishing with an aluminum oxide abrasive, flame-pyrolytic deposition of silicon dioxide and application of a primer, etching with hydrochloric acid, treatment by atmospheric plasma, ns-pulsed laser surface cleaning, and fs-laser structuring are investigated. The effects of these treatments are analyzed in surface energy investigations by contact angle measurement, roughness measurements, and SEM-EDX. The bonding strength is tested with epoxy adhesives and a methyl methacrylate adhesive under 90° peel load. The failure mechanisms are further investigated by FTIR spectroscopy and SEM-EDX. The results show that the used coating with primer produces the strongest bonds, followed by the fs-laser treatment. In particular, sub-microscopic surface structures induced by fs-laser show promising results. SEM images show a full wetting of the capillary structures, providing the possibility of mechanical interlocking on a sub-microscopic level. [ABSTRACT FROM AUTHOR] more...
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- 2025
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11. Investigation of the thermal strain behaviour of bonded joints in a cryogenic environment.
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Seewald, Robert, Bayer, Maximilian, Schiebahn, Alexander, and Reisgen, Uwe
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THERMAL strain , *LIQUEFIED gases , *SPACE flight , *LOW temperatures , *SHEAR strength , *ADHESIVE joints - Abstract
Low temperatures up to the cryogenic range represent an increasingly relevant area of application both in space travel, in the transport and storage of liquid gases and in the field of research (e.g. superconductivity). Adhesive bonding is a predestined joining method for joints in these applications. However, the material behaviour of adhesives and in particular the mechanical behaviour of bonded joints at cryogenic temperatures has been little researched. This paper compares the tensile and shear strengths of adhesives and bonded specimens at room temperature and cryogenic temperature and also investigates the strains occurring within the bonded joint. An increase in strength of up to 35% at a temperature of 77 K is found for tensile shear specimens. For tensile specimens, the increase is up to 347% due to embrittlement of the polymeric material. When examining the strains, the largest resulting contractions are found to be up to 0.6% at the interface between the adhesive and the joined part due to different expansion coefficients of the materials. [ABSTRACT FROM AUTHOR] more...
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- 2025
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12. Collaborative interfacial shear capacity of adhesive bonding and novel shooting nail for steel plate strengthening concrete structures.
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Xu, Mingxue, Ren, Lei, Shi, Zheng, and Liu, Xiaogang
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CONCRETE construction , *CIVIL engineering , *ADHESIVES , *REINFORCED concrete , *CIVIL engineers - Abstract
Shooting nail is a novel fastening approach for the reinforcement of concrete bridges and building structures using bonding steel plates, offering enhanced construction efficiency compared to traditional chemical anchor bolts. In addition, it may provide additional collaborative interfacial shear capacity contribution with adhesive bonding, but relative research is limited. To comprehensively explore the interfacial shear capacity of steel plate-concrete with adhesive bonding and shooting nail fastening, experimental investigations were first conducted. Afterward, FEA was utilized to investigate the influencing parameters on the collaborative contribution of adhesive bonding and shooting nails to interfacial shear capacity, including concrete strength, steel plate thickness, and nail spacing. On these bases, theoretical analysis of the additional interfacial shear contribution of shooting nails to steel place-concrete interface was conducted. Finally, based on the calculation formula of interfacial shear capacity of steel plate-concrete adhesive bonding, a new theoretical calculation approach of interfacial shear capacity was provided, considering the contribution of both adhesive bonding and shooting nail fastening. [ABSTRACT FROM AUTHOR] more...
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- 2024
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13. Modeling and analysis of hybrid bonded-bolted joining in large-scale aircraft assembly.
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Eliseev, Artem, Lupuleac, Sergey, Shinder, Julia, Grigor'ev, Boris, and Khashba, Valeriia
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FLUID-structure interaction , *FINITE element method , *MODEL airplanes , *PHENOMENOLOGICAL theory (Physics) , *JOINING processes - Abstract
Hybrid bonded-bolted (HBB) joining is common method used in aircraft assembly, particularly for critical junctions such as the wing-to-fuselage joint, to ensure both quality and durability. Accurate simulation of HBB joining presents a significant challenge, as it requires a proper description of the contact interaction of the assembled parts, the flow of adhesive used for bonding, and their mutual influence. In this paper, the process of HBB joining of the upper wing panel and fuselage of a commercial aircraft is simulated. The utilized mathematical model is comprehensive in several ways. Firstly, it covers all the most important physical phenomena determining the intermediate and final result of the assembly process, notably including the two-way fluid-structure interaction and the presence of a free surface in the fluid part. Secondly, the finite element model of the joint has dimensions and level of detail comparable to models used in industrial applications. Finally, the complete sequence of assembly stages is reproduced during the simulation, including the installation of temporary fasteners and their replacement by permanent ones. The paper focuses on investigating the problem of permanent fasteners loosening, a critical issue in aircraft assembly. The state-of-the-art aircraft assembly technologies typically include requirements intended to prevent significant loosening of permanent fasteners by the end of the assembly process. The validity of these requirements is studied using a series of numerical tests with a specially developed simulation tool. Three distinct fastening installation scenarios during the multistage wing-to-fuselage assembly process were considered. The simulation results were analyzed and compared in terms of permanent fastener loosening. [ABSTRACT FROM AUTHOR] more...
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- 2024
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14. A Simple Surface Treatment for Improving the Adhesive Bonding Properties and Durability of an AlMg 3 Alloy.
- Author
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Fan, Changfeng, Yang, Bo, Wang, Xue, Zhan, Xianghua, Yin, Xiaoli, Shi, Jianmin, Liu, Yancong, and Dilger, Klaus
- Abstract
The structural adhesive bonding of aluminum is widely used in the aircraft and automotive industries. The surface preparation of aluminum prior to adhesive bonding plays a significant role in improving the bonding strength. Surface cleanliness, surface roughness, and surface chemistry can be controlled, primarily, by proper surface treatment methods. In this study, the effect of varying the chemical treatment period on the adhesive bonding characteristics was investigated. An epoxy adhesive was used to join the treated surfaces, and the bond strengths were evaluated via single lap-shear (SLS) tests in pristine, as well as degraded, conditions. The surface morphology, chemistry, and corrosion properties of the surfaces with chemical treatments were characterized using various surface analytical tools, such as scanning electron microscopy, an energy dispersive spectrometer (SEM/EDX), and an electrochemical workstation. Excellent adhesion characteristics, with the complete cohesive failure of the adhesive, were encountered on the surfaces of the H2O2-treated samples. The H2O2-treated samples exhibited the highest initial bond strength, reaching 22.5 ± 0.5 MPa, and showed a decrease of only 10% (to 18.1 ± 0.2 MPa) after aging under extreme humidity and temperature conditions (70 °C and 100% R.H. for 4 weeks). The chemical treatment reported in this work is a very simple method to produce durable joints. [ABSTRACT FROM AUTHOR] more...
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- 2024
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15. A state-of-the-art review on adhesively bonded joints of similar and dissimilar materials.
- Author
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Akkasali, Naveen Kumar, Biswas, Sandhyarani, Sen, Sujit, and Anitha, S.
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FATIGUE limit , *LAP joints , *SURFACE preparation , *ADHESIVES , *STRESS concentration , *ADHESIVE joints - Abstract
In recent years, adhesive bonding has increasingly been used in many applications as it has many advantages over traditional joining techniques. More uniform stress distribution, absence of damage in the adhesive-bonded parts, high fatigue resistance, ease of manufacture, capability of fluid sealing, and the possibility of joining dissimilar materials are the advantages of adhesive bonding. This paper reviews the current research, advancements in adhesively bonded single lap joints (SLJs) and the related issues for joining different materials. The influence of various factors such as loading direction joint geometry, type of adhesive, type of adherend, joining technique, surface preparation technique, and environmental conditions on the bond properties of the adhesively bonded joints are also discussed. Different failure mechanisms associated with adhesive bonding are also highlighted. The geometry and method of manufacturing, surface preparation, and curing conditions significantly influence the strength of adhesively bonded joints. The combined surface treatment substantially affects the mode of failure in the adhesive joints. Among the different numerical methods, the cohesive zone modelling (CZM) approach can forecast the adhesive strength of joints for a wide range of designs with minimal error. Advanced numerical methodologies, such as the eXtended finite element method (XFEM) or meshless methods, have been utilized for adhesive joint analysis; however, further enhancements are requisite for their broader adoption. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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16. Impact of SiO 2 and TiO 2 Nanoparticles on the Elasticity and Aging Resistance of Polyvinyl Acetate (PVAc) Adhesive.
- Author
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Petković, Gorana, Pasanec Preprotić, Suzana, Vukoje, Marina, and Bolanča Mirković, Ivana
- Abstract
Adhesive modification with nanoparticles affects multiple adhesives properties, making it essential to evaluate and compare changes across all key characteristics—existing positive and limiting properties. This study investigates the impact of silica (SiO2) and titanium dioxide (TiO2) nanoparticles on the elasticity and aging resistance of PVAc adhesive. Tensile properties were determined according to ISO 527-3:2018, with Young's moduli of elasticity Ε , and stress–strain curves for neat PVAc, nano-SiO2 PVAc, and nano-TiO2 PVAc adhesive. Material toughness ( U T ), failure stresses σ f , and failure strains ε f were also calculated. After UV exposure (0, 48, and 96 h), according to ISO 9142:2003, samples were characterized by Fourier-transform infrared spectroscopy (FTIR). Analysis of variance (ANOVA) was performed to determine if there is a statistically significant difference in material toughness between neat PVAc and nano-modified PVAc adhesives, as well as changes in FTIR spectra of paper–adhesive samples before and after UV exposure. The Bonferroni post hoc test was used to identify specific group differences. The results showed that SiO2 nanoparticles improved PVAc elasticity by 9.15%, while TiO2 nanoparticles reduced elasticity by 44.47%. FTIR analysis revealed similar behavior in both nano-modified and neat PVAc adhesives after UV exposure, indicating that aging resistance was preserved with the addition of SiO2 or TiO2. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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17. Multiaxial stress effects on bonding strength in adhesively bonded joints.
- Author
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Yokozeki, Koichi, Vallée, Till, and Evers, Tobias
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SURFACE preparation , *MATERIALS analysis , *MILD steel , *HYDROSTATIC pressure , *ADHESIVES , *ADHESIVE joints - Abstract
This study investigates adhesive bonding as a crucial engineering technique for joining materials, with a focus on load distribution, structural enhancement, and weight reduction. Advances in adhesive formulations, surface preparation, and application techniques continue to expand its capabilities. The research addresses stresses in hybrid joints resulting from pre-tensioning bolts and subsequent axial loading, emphasizing the influence of normal stresses on the critical adhesive-steel interface. Off-axis samples are bonded to mild steel using four different adhesives: SW7240, S370, DP460 (2K-epoxies), and SF479 (2K polyurethane). The choice of adhesive significantly influences shear strength under various loading conditions. Formulating this interaction in terms of maximum shear or von Mises stresses leads to relatively complex failure criteria that make the further analysis dependent on each adhesive. On the other hand, expressing strength at maximum principal stress significantly simplifies comparative analysis, as it consistently exhibits an almost linear trend, indicating strength reduction with increasing hydrostatic pressure for all adhesives, potentially simplifying subsequent strength predictions of hybrid joints. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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18. An enhanced surface treatment for effective bonding of 7075-T6 aluminium alloys.
- Author
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Ali, Mahfoudh Taleb, Jebri, Zaineb, and Jumel, Julien
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ALUMINUM alloys , *SURFACE preparation , *SUBSTRATES (Materials science) , *SCANNING electron microscopy , *SULFURIC acid - Abstract
This study research focuses on optimising adhesion through surface treatments on 7075-T6 aluminium alloy substrates using a chromium-free protocol. The treatment involves acetone degreasing, NaOH etching, and sulphuric acid-based solution etching. Wettability analysis and scanning electron microscopy were used to characterise the treated surfaces, highlighting the effectiveness of the proposed protocol. The proposed etching protocol was then applied to aluminium alloy substrates, and fracture surfaces corresponding to each treatment were compared. Mechanical testing, specifically double cantilever beam (DCB) experiments, assesses the fracture energy of bonded assemblies in mode I. The results demonstrate that the sulphuric acid-based treatment significantly improves the surface characteristics, leading to enhanced adhesion and optimal fracture energy in bonded aluminium assemblies. [ABSTRACT FROM AUTHOR] more...
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- 2024
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19. Modeling and Simulation of Curing Kinetics and Stress of a Bonded Mirror with a Room-Temperature Curable Adhesive.
- Author
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Zhang, Xiumin, Liu, Jianhua, Xia, Huanxiong, Ao, Xiaohui, Zhao, Yuxi, Zhou, Jiechen, Liu, Xin, Wang, Yuhe, and Yang, Wang
- Subjects
POISSON'S ratio ,MECHANICAL behavior of materials ,STRESS relaxation tests ,MECHANICS (Physics) ,STRAINS & stresses (Mechanics) ,ADHESIVE joints - Published
- 2024
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20. Enhancing adhesive bonding and mechanical properties of composite sandwich panels through atmospheric plasma activation.
- Author
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Ozbek, Yagiz, Yildirim, Ceren, Yakin, Fetiye Esin, Topal, Serra, Yildiz, Mehmet, and Sas, Hatice S.
- Subjects
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NOTCHED bar testing , *DYNAMIC mechanical analysis , *TENSILE tests , *IMPACT strength , *TENSILE strength , *SANDWICH construction (Materials) - Abstract
Highlights This study investigates the effect of atmospheric plasma activation (APA) treatment on the thermomechanical performance of adhesively bonded skins of composite sandwich panels. The investigations show that APA treatment enhances surface wettability through the water contact angle measurements, and adhesion between the skin and honeycomb core of the panels under mechanical tests. Specifically, APA treatment results in an 11% increase in flatwise tensile strength and a 12% enhancement in the impact strength of the sandwich laminates. Flatwise tensile tests reveal superior tensile strength and toughness in APA‐treated specimens, with fracture patterns suggesting more robust adhesion. Charpy impact test results confirm increased energy absorption, reflecting better mechanical resilience. Scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA) techniques are utilized to validate these findings. Overall, APA treatment proves to be an effective technique for enhancing the performance of composite sandwich panels, offering improved adhesion, strength, and impact resistance. This approach holds significant promise for advancing high‐performance composite materials in various engineering applications. APA treatment enhances wettability and adhesion in sandwich panels. Improved adhesive distribution between skin‐core after sandwich manufacturing. 11% increase in tensile strength and 12% in impact strength with APA. Better toughness and energy absorption via SEM and DMA support in APA. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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21. Finite element modelling of adhesively bonded timber-concrete composite beams.
- Author
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Shehada, Mohammed, Djamaï, Zakaria Ilyes, and Duprat, Frédéric
- Subjects
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STRESS concentration , *COMPOSITE construction , *FINITE element method , *FAILURE mode & effects analysis , *ADHESIVES - Abstract
This study presents a 3D non-linear Finite Element (FE) model for adhesively bonded Timber-Concrete Composite (TCC) beams. A comprehensive analysis was conducted through a combination of numerical simulations and experimental tests by investigating the deformation behaviour, bending stress distribution, ultimate capacity, and failure characteristics of TCC beams. Despite the challenges that arose in cases of bonding failure, leading to exceptional deviations in behaviour, the results revealed a remarkable agreement between the predictions of the FE model and the outcomes of experimental tests. The FE model accurately predicted the degree of composite action. Notably, the FE model and analytical model based on the γ-method exhibit comparable predictive performance in terms of deformation. Bending stress distribution findings highlighted a strong correspondence between FE simulations and experimental data. Furthermore, the FE model demonstrated efficacy in predicting the ultimate capacity of TCC beams and consistently captured failure modes, indicating its reliability in simulating the complex behaviour of TCC beams. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
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22. Damage behavior and dynamic response of nano-silica reinforced aluminum 2024-T3/GFRP composite laminate subjected to high-velocity impact.
- Author
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Vijayan, Muniyan, Velappan, Selladurai, and Ayyavoo, Karthikeyan
- Subjects
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SANDWICH construction (Materials) , *FIBROUS composites , *DATA acquisition systems , *LIGHTWEIGHT materials , *ALUMINUM composites - Abstract
This study focuses on analyzing the damages and ballistic limit for the fiber metal laminate (FML) and nano-silica reinforced FML. FML materials are hybrid sandwich composite materials used in lightweight structural applications. FML is constructed as a sandwich structure by bonding an aluminum alloy and a glass fiber reinforced composite. To enhance the impact strength of the FML composite, it was reinforced with nano-silica particles within the epoxy resin at various concentrations ranging from 1 wt% to 7 wt%. The laminates are then subjected to high-velocity impact tests using a single-stage gas gun setup, to assess the failure modes of the FML in an aluminum sheet and nanocomposite layers. The influence of nano-silica on natural frequency and damping factor is also examined by using a shock sensor and DAQ (Data Acquisition system). Results indicate that the FML laminate containing 5 wt% nano-silica demonstrates superior impact resistance compared to other filler percentages, as demonstrated by the ballistic limit and damage assessment. The ballistic limit for the pure FML laminate without nano-silica is 98 m/s, whereas the FML laminate containing 5 wt% nano-silica exhibits a peak value of 112 m/s, presenting a notable 14.3% increase in ballistic limit compared to the pure FML. Additionally, the dynamic response analysis reveals changes in the natural frequency values of the laminates before and after impact, indicating permanent damage to the laminate structure. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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23. Damage tolerance analysis of double strap joints with composite adherends.
- Author
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Jokinen, J., Orell, O., Hakala, P., Rodera, O., Wallin, M., and Kanerva, M.
- Subjects
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COMPOSITE structures , *ADHESIVES , *NUMERICAL analysis , *SENSITIVITY analysis , *STATISTICS - Abstract
Damages in composite structures are typically repaired using external bonded patches. In this work, the damage tolerance within external patches is studied using double strap joint (DSJ) with carbon fibre reinforced plastic (CFRP) specimens. The damage tolerance in this work refers to bond-line manufacturing-related defects such as debond or dry area. Both intact and pre-cracked DSJ specimens are numerically analysed using experiments for comparisons. DSJ specimens' adherends were CFRP laminates with AS4/3501–6 plies and bonded using adhesive film FM 300–2. The pre-cracked specimens are monitored during experiments using high-speed digital image correlation to visualize damage propagation. The unsymmetric pre-crack influences in a clear way as shown by experiments. The numerical analyses reveal the effect of failure mechanisms on final failure and the maximum force during a test. The included parametric sensitivity analysis is performed using statistical methods. The normally distributed parameters are sampled using separate distributions for each analysed interface and fracture mode. UNCLASSIFIED Based on Foreground Information under EDA Contract No B.PRJ.RT.670 covering the Ad Hoc Project entitled "PATCHBOND II". [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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24. Heat‐Treatment and Water Immersion Effect on the Mechanical Properties and Joint Strength of 3D‐Printed Polylactic Acid Parts.
- Author
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Öztürk, Fatih Huzeyfe and Öz, Özkan
- Subjects
WATER immersion ,HEAT treatment ,TENSILE strength ,TENSILE tests ,ADHESIVE manufacturing ,POLYLACTIC acid - Abstract
This paper investigates the effect of short‐time water immersion (WI) and heat‐treatment (HT) post‐processes on the mechanical properties and joint strength of printed polylactic acid (PLA) parts with various raster angles. Using these post‐processing methods to enhance the joint strength of printed PLA parts could be deemed as the novelty and the contribution of the current study. The WI and HT of the tensile test specimens and the adherends of the bonded joints were carried out at 21°C and 90°C, respectively. Depending on the raster angle, the tensile strength of the heat‐treated specimens was about 11%–43% higher than that of the untreated specimens. Interestingly, it was found that WI had a more significant effect on the strength of printed parts than HT. In the case of WI, the tensile strength was increased by about 27%–57% as compared to the untreated specimens. Joint tests revealed that HT and WI exerted a similar positive effect on the strength of the joints. The findings highlighted that short‐time WI is at least as effective as HT in increasing the tensile and joint strengths of 3D‐printed PLA parts. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
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25. Effects of Surface Treatment and Morphology on Static and Fatigue Strengths of Adhesively Bonded Steel Plate.
- Author
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Takesue, Shogo and Morita, Tatsuro
- Subjects
FATIGUE limit ,ATMOSPHERIC pressure plasmas ,X-ray photoelectron spectroscopy ,SHEAR strength ,SURFACE preparation - Abstract
Both weight reduction and increase in safety of a car body are required in the automobile industry. Therefore, studies on a multi-material car body structure have progressed. To achieve this structure, techniques that can join dissimilar materials are necessary. Adhesive bonding is an effective joining method used for this purpose. However, the strength of adhesively bonded joints is low and should be improved. Treatment of the adherend surfaces is an effective method to increase the strength of adhesively bonded joints. In this study, blasting, atmospheric-pressure plasma irradiation, and their combined treatment were applied to steel plate cold commercial (SPCC) surfaces, and adhesively bonded joints were prepared using the treated SPCC sheets. The effects of the treatments on the characteristics of the SPCC surfaces and strength of the adhesively bonded joints were investigated. The characteristics of the SPCC surfaces were analyzed using laser microscopy, X-ray photoelectron spectroscopy, and contact angle measurements. The static shear strength and fatigue properties of the adhesively bonded joints were examined. Blasting was found to be effective for increasing the static shear strength and fatigue properties of the adhesively bonded joints formed with the SPCC adherends because of the creation of surface asperities and generation of an anchor effect. Although atmospheric-pressure plasma irradiation decreased the contact angle of the SPCC surfaces owing to the elimination of the organic pollution layer, it did not increase the static shear strength and fatigue properties of adhesively bonded joints with the SPCC adherends. Therefore, the effect of the surface morphology on the static shear strength of the SPCC adhesively bonded joints was investigated in detail. Surface asperities with considerable height, narrow width, and several fine valleys were found to be effective for realizing adhesively bonded joints with higher static shear strength. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
26. Combination of scanning electron microscopy and digital image correlation for micrometer-scale analysis of shear-loaded adhesive joints.
- Author
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Diez, Jörg Gregor, Holtmannspötter, Jens, Arikan, Elisa, and Höfer, Philipp
- Subjects
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DIGITAL image correlation , *CARBON fiber-reinforced plastics , *SPECKLE interference , *SCANNING electron microscopy , *ADHESIVES - Abstract
To understand adhesive bonds and their macroscopic behavior, a new experimental method is presented in this paper that allows to investigate micromechanical effects down to nanometer scale under load. The method combines ion milled cross sections, low-voltage scanning electron microscopy (SEM), digital image correlation, and a miniaturized testing machine in the SEM-chamber. Experimental results from shear-loaded adhesively bonded carbon fiber-reinforced polymer specimens illustrate the method's benefits. Through a plasma etching process, the specimen cross section is textured, creating a stochastically distributed speckle pattern visible in SEM images. A miniaturized testing machine placed in the SEM is used to apply a load to the specimens while capturing images simultaneously. The resulting image series can be analyzed by image correlation algorithms. This method enables precise statements regarding strain distribution on the specimen at micro- and nanometer scales. While conventional coupon tests on bonded specimens can only depict the effects of a composite in a homogenized manner, the new method allows to gain additional insights into the underlying mechanisms. [ABSTRACT FROM AUTHOR] more...
- Published
- 2025
- Full Text
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27. Influence of the joining technique on the structural behaviour of hybrid timber-steel cross-sections.
- Author
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Haase, Peter, Boretzki, Jakob, Aurand, Simon, Sandhaas, Carmen, Ummenhofer, Thomas, and Albiez, Matthias
- Subjects
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STEEL manufacture , *BUILDING design & construction , *WOODEN building , *CONSTRUCTION planning , *TIMBER - Abstract
Timber as construction material has a long tradition and is increasingly coming into focus as a renewable material in the planning and construction of buildings. Nevertheless, there are mechanical limitations, especially for multi-storey buildings or large spans. In order to enable large spans with small cross-sections, steel and timber can be combined in a hybrid cross-section for bending beams. In this case, the performance of the hybrid component decisively depends on the bond of the individual cross-sections. The aim of this publication is to compare and investigate different joining techniques for an efficient bond between timber and steel. Small-scale specimens were used to investigate different bonding methods: dowel-type fasteners, punched metal plate fasteners (PMPF) and adhesive bonds between timber and steel. Adhesive bonded specimens exhibited stiff but brittle behaviour. The adhesive bond remained intact in all tests, while shear failure could be detected in the timber. Adhesive bonds exhibited 93 times the stiffness of dowel fasteners and 5.5 times the stiffness of PMPF. The load carrying capacity increased by approximately 80% compared to dowel-type fasteners and 30% compared to PMPF, demonstrating the superior suitability of adhesive bonds for high performance timber-steel hybrid sections. [ABSTRACT FROM AUTHOR] more...
- Published
- 2025
- Full Text
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28. Failure mechanisms in pre-tensioned bonded hybrid joints.
- Author
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Yokozeki, Koichi, Vallée, Till, and Evers, Tobias
- Subjects
- *
DIGITAL image correlation , *SHEAR (Mechanics) , *FAILURE mode & effects analysis , *FINITE element method , *SHEAR strength , *ADHESIVE joints - Abstract
This study investigated the failure mode of pre-tensioned bonded hybrid joints in steel structures using Digital Image Correlation (DIC) alongside Finite Element Analysis (FEA) and compared the results with those of adhesive bonded joints of identical geometry. While all joint types initially exhibited ideal adhesive joint behaviour at low loading levels, with linear elastic response, differences emerged as loading increased. In particular, hybrid joints exhibited out-of-plane deformations near the ends of the splice plates, a feature not observed in bonded joints. Shear deformations consistently peaked at the ends of the overlap for all joint types and increased with increasing load levels. In contrast to bonded joints, hybrid joints demonstrated resilience under escalating loads, maintaining resistance due to the presence of bolts despite the increased deformations. This study contributes to the understanding of the observed failure mode: while hybrid joints initially resembled ideal bonded joints at lower loads, increasing loads caused critical cracks to initiate at the overlap ends in the adhesive layer, culminating in bonded joint failure. In conclusion, this study has elucidated the failure mode of hybrid joints, providing insights for modelling and dimensioning in steel structures. [ABSTRACT FROM AUTHOR] more...
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- 2025
- Full Text
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29. Laser-induced surface reconstruction to enhance interfacial bonding reliability of CFRP/titanium hybrid joints
- Author
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Zhaoyi Liu, Hui Wang, Yizhe Chen, and Lin Hua
- Subjects
Adhesive bonding ,Multi-material joining ,Carbon fiber-reinforced polymer (CFRP) ,Surface modification ,Nd:YAG laser ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Adhesive bonding is widely used in aeronautical carbon fiber-reinforced polymer (CFRP)/titanium (Ti) alloy hybrid structures to satisfy the demands of high-strength and lightweight. The physicochemical properties of adherend surfaces significantly impact the bonding performance. In this study, laser-induced surface reconstruction (LISR) was designed for the reliable joining of Ti alloy and CFRP. A three-level-three-factor central composite design (CCD) approach-based response surface methodology (RSM) analysis was applied to statistically specify parameter optimization of the laser energy output. Surface morphology and wettability of CFRP ablated were studied. Chemical compositions were determined by X-ray photoelectron spectroscopy (XPS). Tensile-shear tests were performed, and fractured surfaces were analyzed. The tensile shear strength with LISR process has been improved by 19.1%, in comparison with that of mechanical grinding treatment. The cross-like texture based on designed geometric configuration was fabricated without damaging the underlying fibers, thus increasing the surface roughness and contact area at interface. The wettability transition mechanism was investigated, demonstrating that the hydrophilicity of reconstructed surfaces primarily attributes to the more polar groups (C–O, CO, etc.) on CF surfaces. This study provides a reliable surface treatment method for fabricating high-performance composite structures by adhesive bonding. more...
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- 2024
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30. Influence of the water content in polyamide 6 on atmospheric pressure plasma jet pre-treatment and adhesion for adhesive bonding.
- Author
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Beier, Christoph J. A., Schiebahn, Alexander, and Reisgen, Uwe
- Subjects
ATMOSPHERIC pressure plasmas ,PLASMA jets ,CONTACT angle ,BOND strengths ,ADHESIVES ,ADHESION - Abstract
To quantify the influence of absorbed water in PA6 on the pre-treatment and bonding process, an unfilled and unreinforced PA6 material is investigated in a dried and saturated state. The material is pre-treated by atmospheric pressure plasma jet (APPJ) with varying jet distances. The surfaces are investigated by contact angle measurements, DSC and FTIR to detect molecular and morphological changes in the surface. To evaluate the bonding strength, samples are bonded with a two-component polyurethane adhesive and a two-component acrylate adhesive and tested in a lap shear and a tensile configuration. The results show that water content has a significant influence on the effectivity of the pre-treatment process and the resulting bonding strength and failure mechanism. The adhesion is majorly affected, however these effects do not influence the macroscopic wetting behavior and cannot be measured in contact angles. FTIR spectra and DSC scans do not show significant changes in molecular groups or crystallinity that would explain the observed adhesion improvement in dried samples. High bonding strength is only achieved with adherents at low water content. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
31. Stress Analysis of Glass Fiber-Reinforced Polymer Lap Joints with Modified Adhesives at Various Temperatures.
- Author
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Caglar, Hasan, Idapalapati, Sridhar, Sharma, Mohit, and Sin, Chian Kerm
- Subjects
STRAINS & stresses (Mechanics) ,BENDING stresses ,SHEARING force ,LAP joints ,BENDING moment ,ADHESIVE joints - Abstract
This study examines stress distributions in adhesive joints under various loading and temperature conditions. Finite element analysis (FEA) was employed to compute the peel and shear stresses at the adhesive interface and bondline mid-section. Dependency analysis shows that mid-section peel stress significantly impacts the experimental shear strength of SLJs more than shear stress. This insight highlights the need to carefully analyze peel stress and bending moment factors. The analytical solutions proposed by Goland and Reissner were analyzed with modifications by Hart-Smith and Zhao. Hart-Smith's approach performed more effectively, especially when the adhesive layer thickness (t
a ) was 0.5 mm and the overlap length to thickness ratio (c/ta ) was ≥20. FEA revealed stress distributions at the adhesive/adherend interface and bondline mid-section. DP490 adhesive joints exhibited lower stresses than EA9696. Temperature variations significantly affected joint behavior, particularly above the adhesive's glass transition temperature (Tg ). Both EA9696 and DP490 adhesive joints displayed distinct responses to stress and temperature changes. The parabolic and biquadratic solutions for functionally graded adhesive (FGA) joints were compared. The biquadratic solution consistently yielded higher shear and peel stress values, with an increase ranging from 15% to 71% compared to the parabolic solution at various temperatures because of the larger gradient of the Young's modulus distribution near the overlap ends. The ratio of peak peel stress to peak shear stress suggests that selecting an adhesive with a superior peel strength or primarily reducing the peak peel stress by functionally grading is advisable, particularly if the adhesive is brittle. The comparison of stress distributions emphasizes the importance of selecting adhesives based on stress type, temperature, and solution methods in optimizing adhesive bonding applications. These findings provide valuable insights for thermomechanical applications where thermal stimuli may be used for controlled debonding. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
32. Experimental Study of Single-Lap Adhesive Joints to Analyze and Predict the Tensile Strength Values of Aluminum Alloy 6061 Substrates using Artificial Neural Networks.
- Author
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Enzi, Abass, Hassoon, Omar Hashim, Hussein, Osama H., and Kashkool, Lujain H.
- Subjects
ARTIFICIAL neural networks ,ADHESIVES ,SURFACE roughness ,TENSILE tests ,ALUMINUM alloys ,ADHESIVE joints - Abstract
Copyright of Tikrit Journal of Engineering Sciences is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) 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.) more...
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- 2024
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33. 基于胶膜转印的气动微阀及微流控芯片.
- Author
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徐校杰, 田浩为, 邱 晔, 吴梦希, and 刘军山
- Abstract
Copyright of Micronanoelectronic Technology is the property of Micronanoelectronic Technology Editorial Office 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.) more...
- Published
- 2024
- Full Text
- View/download PDF
34. Improvement of production efficiency and optimization of exit-hole–free FSSW joints using adhesive-bonded consumable pin and lubrication.
- Author
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Bhardwaj, Nitish, Narayanan, Ganesh R., and Dixit, Uday Shanker
- Subjects
- *
FRICTION stir welding , *TOOL-steel , *FINITE element method , *DAMAGE models , *WELDING - Abstract
This work presents an optimum methodology for producing friction stir spot welding (FSSW) joints using a detachable consumable pin. The study is carried out by welding two AA6061-T6 sheets using a consumable pin of the same material attached to the H13 steel tool. Three methods for attaching the consumable pin to the tool are explored: (1) push-fitting the pin in an indentation on the tool, (2) adhesively bonding the pin to the tool with a cyanoacrylate adhesive, and (3) adhesively bonding the pin to the tool with a thermosetting glue. After welding, the pin gets detached and assimilated into the workpiece. Cyanoacrylate adhesive–bonded consumable pin was the most effective in producing exit-hole–free FSSW joints with good joint strength. The use of lubricants along with adhesive-bonded consumable pins resulted in a reduction of energy requirement by 35 − 42% without compromising joint strength. Optimization was carried out using data from experiments as well as finite element method simulations. For simulating the lap shear test, the Cockcroft-Latham damage model was used. The optimum process parameters for obtaining the maximum joint strength were a rotational speed of 900 revolutions per minute and a plunge rate of 15 mm/min. Based on the study, a strategy for batch production is also proposed for enhancing productivity. [ABSTRACT FROM AUTHOR] more...
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- 2024
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35. Thin porous Ni‐foam enhanced CFRP/Al adhesive joint inserted by ultrasonic vibration.
- Author
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Zhou, Zhengwu, Wang, Yongfei, and Chen, Chao
- Subjects
- *
ADHESIVE joints , *FATIGUE limit , *LAP joints , *WEIBULL distribution , *RELIABILITY in engineering , *FOAM - Abstract
Highlights To enhance the mechanical properties of the adhesive layer in joints, a thin–structural open–cell porous Ni–foam was embedded into the adhesive interface through ultrasonics (US) assisted. The porous metal foam is effective in interlocking itself with adhesive. After the ultrasonic vibration was applied for 0.17 s, the adhesive penetrated Ni–foam, generating enough residue. This technique effectively improves the energy absorption and shear strength of the CFRP/Al single lap joint by more than 250.33% and 118.4% with a 0.5 mm thick Ni–foam insert, respectively. The fatigue resistance increased by 154% with a 0.3 mm thick Ni–foam insert based on the fatigue testing results and the Weibull distribution method. The S–N curves were established at different reliabilities for engineering applications. With the Ni–Foam insert, the failure modes were changed through crack deflexion, Ni–Foam degumming, and crack blocking. Ultrasonic vibration assisting Ni‐foam inserts CFRP/Al adhesive joints. The shear strength of joints with Ni‐foam was maximally increased by 118.4%. The fracture forms of joints with Ni‐foam were changed. The fatigue life of the joints with Ni‐foam was maximally increased by 154%. S–N curve of joint with Ni–foam of different reliability levels was got. [ABSTRACT FROM AUTHOR] more...
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- 2024
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36. Exploring Bio-Based Polyurethane Adhesives for Eco-Friendly Structural Applications: An Experimental and Numerical Study.
- Author
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Couto, Ana M. S., Borges, Catarina S. P., Jalali, Shahin, Simões, Beatriz D., Marques, Eduardo A. S., Carbas, Ricardo J. C., Bordado, João C., Vallée, Till, and da Silva, Lucas F. M.
- Subjects
- *
FINITE element method , *AUTOMOBILE industry , *FIBER orientation , *CRACK propagation (Fracture mechanics) , *FAILURE mode & effects analysis , *ADHESIVE joints - Abstract
In response to heightened environmental awareness, various industries, including the civil and automotive sector, are contemplating a shift towards the utilization of more sustainable materials. For adhesive bonding, this necessitates the exploration of materials derived from renewable sources, commonly denoted as bio-adhesives. This study focuses on a bio-adhesive L-joint, which is a commonly employed configuration in the automotive sector for creating bonded structural components with significant bending stiffness. In this investigation, the behavior of joints composed of pine wood and bio-based adhesives was studied. Two distinct configurations were studied, differing solely in the fiber orientation of the wood. The research combined experimental testing and finite element modeling to analyze the strength of the joints and determine their failure mode when subjected to tensile loading conditions. The findings indicate that the configuration of the joint plays a crucial role in its overall performance, with one of the solutions demonstrating higher strength. Additionally, a good degree of agreement was observed between the experimental and numerical analyses for one of the configurations, while the consideration of the maximum principal stress failure predictor (MPSFP) proved to accurately predict the location for crack propagation in both configurations. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
37. Evaluating structural strength and vibrational characteristics of silicon carbide incorporated adhesively bonded single lap joints.
- Author
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Dhilipkumar, Thulasidhas, Rajesh, Murugan, Sathyaseelan, P., Sasikumar, R., and Murali, Arun Prasad
- Subjects
- *
LAP joints , *FIELD emission electron microscopes , *EPOXY resins , *GLASS fibers , *ADHESIVE joints , *SILICON carbide - Abstract
The adhesive bonding approach is widely used in assembling of spars, stringers, ailerons, flaps, and rudders in aircraft. The present research investigated the impact of silicon carbide (SiC) nanoparticle inclusion on the shear and free vibrational behaviour of adhesively bonded single lap joints (SLJ). The shear test results showed that the inclusion of 1.5 wt.% SiC in the epoxy resin enhanced the shear behaviour of adhesively bonded SLJ. Furthermore, the failure surfaces of adhesively bonded SiC-reinforced SLJ were examined using a field emission scanning electron microscope (FESEM). The microstructural investigation of the failure surface demonstrated that the development of rougher surfaces, plastic void enlargement, and formation of shear bands in the joint region had improved adhesion among GFRP adherends. Thus, the SiC-incorporated adhesively bonded SLJ had predominant cohesive failures. Meanwhile, the SiC-free lap joint had an adhesive failure due to lower adhesion. The vibrational results avowed that 1.5 wt.% SiC-incorporated adhesively bonded SLJ has higher natural frequencies. Results also affirmed that higher wt.% SiC-incorporated joint had better modal damping values due to nanoparticle accumulation, which increased the interaction between glass fiber reinforced polymer (GFRP) adherends. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
38. Toughened single-lap joints by composite bondline of adhesive and double-sided tape.
- Author
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Takahashi, Kosuke, Sun, Zhantong, Kikuzawa, Takuma, Shimamura, Kounosuke, Jagrat, Sourabh, Fujimura, Nao, and Nakamura, Takashi
- Subjects
- *
ADHESIVE joints , *ADHESIVE tape , *DIGITAL image correlation , *STRESS concentration , *DEBONDING - Abstract
This study proposes the novel manufacturing method of adhesively bonded joint with double-sided tapes by following the concept of bi-adhesive bondline. The stress concentration at the ends of the bondline for a single-lap joint can be suppressed by utilizing flexibility of the double-sided tapes. The double-sided tapes also make it easy to control the bondline thickness and to hold the adherends with their stickiness until complete cure. A tensile-shear test of the aluminum/acrylic joint verified that replacing both ends of the 30 mm bondline by the 3 mm double-sided tape improved the maximum load by more than 20%. The observation on the bonded area through the transparent acrylic plate revealed the suppression of the debonding initiation. On the other hand, the aluminum/aluminum joint did not show the significant increase in the maximum load, but suppressed the unstable interfacial debonding. The strain distribution obtained by digital image correlation method proved that the double-sided tape has the same effect of compressive strain generated in the flexible adhesive in bi-adhesive bondline. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
39. Feasibility study of adhesively bonded drills with a small diameter for cutting of CFRP.
- Author
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Stribick, Sascha, Wüsteney, Julian, and Demir, Demet
- Subjects
- *
MANUFACTURING processes , *SURFACE preparation , *GLASS transition temperature , *CUTTING tools , *SURFACE texture - Abstract
Adhesively bonded cutting tools possess many advantages over classic (insert) tools due to different manufacturing processes: With reduced manufacturing temperatures, the damage to the cutting edge decreases, and the damping effects of the adhesive enhance the tool's life. In contrast to standard joining technologies like soldering, adhesive bonding enables the joining of various cutting materials and tool base bodies, like ceramic and steel. Furthermore, the usage of expensive, abrasive-resisted cutting materials, like carbide, has to be reduced in future because of the classification of the components (cobalt, wolfram carbide) as a critical resource. Therefore, this article conducts a feasibility study of adhesively bonded drills with a ceramic tip for cutting carbon-fiber-reinforced plastics. The main contents are investigations of different surface preparation methods (laser surface texturing and SACO-blasting), examining four different adhesives for cutting tool usage, and manufacturing and validating prototype drills for cutting operations. The experimental results show a high scattering of the toughness of the joints between 2.8 MPa and 27.8 MPa, depending on the combination of surface preparation and adhesives. Also, the choice of adhesive influences the performance of the manufactured drills. The maximum number of drilled holes scatters between 15 and 67 holes before breakage. A linear relation within the analysis of axial forces and factors of the covered area is observed. For further studies, the surface preparation needs to be improved, the glass transition temperature must be maximized, and the drill geometry must be optimized. Furthermore, a cooling concept for the cutting tools needs to be investigated. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
40. Research Toward Wafer-Scale 3D Integration of InP Membrane Photonics With InP Electronics.
- Author
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Abdi, S., Nodjiadjim, V., Hersent, R., Riet, M., Mismer, C., de Vries, T., Williams, K. A., and Jiao, Y.
- Subjects
- *
OPTICAL receivers , *OPTICAL transmitters , *SEMICONDUCTOR wafer bonding , *SEMICONDUCTOR materials , *INDIUM phosphide - Abstract
In this study, we focus on the development of key processes towards wafer-scale 3-dimentional/vertical (3D) integration of Indium-Phosphide (InP) photonic membranes on InP electronics via adhesive bonding. First, we identified the most critical steps and optimized them to achieve high thermal and mechanical compatibility of components for the co-integration process. Next, we developed a strategy for InP-to-InP wafer bonding with high topology tolerance, and introduced hard benzocyclobutene (BCB) anchors to preserve the alignment and BCB thickness uniformity after bonding. The resulting bond layer is homogeneous in terms of physical and mechanical properties. Finally, we developed a novel method to selectively remove the InP substrate from the photonics side via wet etching while protecting the electronics carrier wafer with hermetic multi-layer coatings. The investigation of these key steps is essential for scalable 3D integration of photonics and electronics at ultra short distances (< $15 ~\mu \text{m}$). [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
41. Experimental Study of Single-Lap Adhesive Joints to Analyze and Predict the Tensile Strength Values of Aluminum Alloy 6061 Substrates using Artificial Neural Networks
- Author
-
Abass Enzi, Omar Hashim Hassoon, Osama H. Hussein, and Lujain H. Kashkool
- Subjects
Adhesive bonding ,Surface roughness ,Overlap distance ,Adhesive strength ,Artificial neural network ,Prediction values ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Adhesive bonding is one of the essential methods applied in wide fields, mainly automotive and aerospace, because the adhesive can be used with various materials, weighs less compared to other methods, is easy to work with, and does not require many tools. The present research focuses on determining and predicting the ultimate tensile values for single-lap adhesive joints. The mathematical models and artificial neural network (ANN) method predict the tensile strength values. Two variables were used: the surface roughness and the bonding area. To determine tensile test values, ten samples were used with different surface roughness and an overlap distance of 25 and 40 mm. The results showed that the bonding distance had more effect than the surface roughness on the ultimate tensile load. Also, the predicted error values through mathematical models did not exceed 3.209% for the samples, while the ANN samples' error values did not exceed 8.312. more...
- Published
- 2024
- Full Text
- View/download PDF
42. Ablation treatment of CFRP via nanosecond pulsed Ytterbium-doped fiber laser: Effects of process parameters on surface morphology and shear strength of adhesive bonded joints
- Author
-
Chiara Mandolfino, Fabrizio Moroni, and Marco Pizzorni
- Subjects
Fiber laser treatment ,Adhesive bonding ,Ablation rate ,CFRP ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Adhesive bonding is the joining technique that provides the maximum exploitation of Carbon Fiber Reinforced Polymers (CFRPs) for structural applications. However, it is necessary to attain a high-strength adhesive bond, achieved by removing surface contaminants, such as mold release agents, and simultaneously generating a surface structure suitable to increase the actual contact surface area. The purpose of the research work presented in this paper is to evaluate the effect of process parameters of a nanosecond pulsed laser pre-bonding surface treatment on the ablation of thermoset matrix CFRP substrates. In particular, the link between the volume of ablated material and the tensile shear strength (TSS) of adhesive bonded joints was evaluated by lap-shear tests, profilometer surveys, and Scanning Electron Microscope (SEM) analysis. ANOVA and regression models were used to highlight the influence of laser parameters, with power emerging as the most significant factor, and energy density proving pivotal for joint strength. Line spacing was also significant, while scanning direction had negligible impact. The key outcomes of the study demonstrated that controlled laser ablation plays a critical role in determining joint performance. A negative correlation was found between TSS and the thickness of ablated material, indicating that excessive ablation weakens the bond. Optimal joint strength was achieved with moderate fiber exposure while maintaining matrix integrity, emphasizing the need for precise control over laser parameters. Fracture surface analyses revealed distinct failure mechanisms, ranging from cohesive failure within the adhesive layer to interfacial failure at the fiber-matrix boundary, depending on the ablation conditions. The findings provide clear guidelines for optimizing laser surface treatments to enhance the structural performance of CFRP adhesive joints in practical applications. more...
- Published
- 2024
- Full Text
- View/download PDF
43. A comprehensive techno-economic and environmental comparison of plasma-treated adhesive-bonded thermoplastic composites
- Author
-
Chiara Mandolfino, Lucia Cassettari, Marco Pizzorni, Luigi Benvenuto, and Enrico Lertora
- Subjects
Thermoplastic composites ,Low-pressure plasma ,Adhesive bonding ,Response surface methodology ,Techno-economic and environmental assessment ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Thermoplastic composites are gaining attention for their ability to support a circular economy, shifting away from traditional cost-driven design. Unlike thermoset composites, commonly used in automotive and aerospace sectors, thermoplastic composites offer recyclability, promoting environmental and economic sustainability. Adhesive bonding in thermoplastic composites provides even stress distribution, maintaining structural integrity and reducing delamination risks, which is crucial for lightweight design in transport and renewable energy applications. Optimising adhesive bonded joints is essential to improve structural integrity, efficiency and sustainability. This involves balancing technical, economic and environmental factors, with surface preparation, plasma treatment in particular, playing a key role.This paper provides a comprehensive techno-economic-environmental comparison of adhesive bonded joints. The study integrates cost-effectiveness, production efficiency and environmental impact assessments to guide informed decision-making. The methodology includes preparing substrates with low-pressure plasma surface treatments, forming adhesive-bonded joints with different adhesives, and optimising process parameters using Response Surface Methodology (RSM). A Life Cycle Assessment (LCA) on optimised scenarios enhances Tensile Shear Strength (TSS). The study concludes with a comprehensive comparison, offering insights for resilient, efficient and sustainable engineering solutions. more...
- Published
- 2024
- Full Text
- View/download PDF
44. Improvements in manufacturability, bonding strength, and curing efficiency of a silicone adhesive
- Author
-
Ye Yang, Jinfeng Xu, Xusheng Chen, Wang Yang, Lina Si, Hongjuan Yan, Zhaoliang Dou, Fengbin Liu, and Huanxiong Xia
- Subjects
Adhesive bonding ,Silicone adhesive ,Bonding strength ,Curing ,Acetone ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Two-component room temperature vulcanizing silicone adhesive RTV566 with a lower elastic modulus has been widely used in precision optomechanical products such as remote sensors and aerospace infrared cameras. However, the silicone adhesive is of poor manufacturability due to its extremely high viscosity, and the bonded joint usually exhibits low bonding strength and requires a long curing time. This paper investigates a way to improve both the adhesion strength and curing efficiency of Invar alloy and optical glass with RTV566 through single-lap experiments. It is found that adding small amounts of acetone and water can significantly reduce the viscosity, enhance the bonding strength, and shorten the curing time. The viscosity can be reduced by 63.4 % and the bonding strength can be improved by 136.4 % with the weight ratio of adhesive to acetone being 20:2. Moreover, a little amount of water in the weight ratio of 100:10:0.1 (adhesive: acetone: water) can shorten the curing time from 7 days to 4 days without harms to the bonding strength and elastic modulus. As to the mechanism, the silicone adhesive can be dissolved by acetone and its sulfuration reaction can be enhanced by water, resulting in good manufacturability and high curing efficiency. This work contributes a novel and easy-to-use method to greatly improve the performances of the bonding process of precision optical structures. more...
- Published
- 2024
- Full Text
- View/download PDF
45. Effects of various process parameters in the joining process on the squeeze flow of highly viscous thermal interface materials
- Author
-
Gilich, J., Teutenberg, D., Meschut, G., Gröger, B., Wiebicke, F., Koch, I., and Gude, M.
- Published
- 2025
- Full Text
- View/download PDF
46. Advances and Future Prospects of Adhesive Bonding and Co-Consolidation Technologies for Aviation Carbon Fiber Thermoplastic Composites
- Author
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Liu, Jiaming, Quan, Dong, Yang, Xi, Zhou, Chuanjian, and Zhao, Guoqun
- Published
- 2024
- Full Text
- View/download PDF
47. Investigation of the Mechanical Performance of Carbon Fiber Reinforced Polymer and Aluminum 2024 Alloy Lap Joints
- Author
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Bhaskar, N. Nithesh and Venkatesh, M. K.
- Published
- 2024
- Full Text
- View/download PDF
48. Damage Development in a Cellular Axisymmetric Tank Additive-Manufactured from Plastic Filament. Part 2. Experimental Studies of Damage to Cellular Shell Systems and the Dependence of Strength Characteristics on Process Parameters.
- Author
-
Bobyr, M. I., Kryshchuk, M. G., Salenko, O. F., Onyshchenko, E. E., Tsurkan, D. O., Kostenko, A. O., Biletskyi, M. V., Orel, V. M., and Lopata, L. A.
- Subjects
- *
HONEYCOMB structures , *CARBON-based materials , *CARBON fibers , *ADHESIVES , *COMMERCIAL product testing - Abstract
The results of experimental studies of the failure of honeycomb structures in the form of axisymmetric shells are presented, and it is shown that the reason for the loss of functional properties of the product is the active growth of a network of predominantly adhesive cracks, which develop into main cracks upon reaching critical load levels. Mechanical tests of demonstrators have shown that cracks in FDM products develop mainly within the filament laying plane, where the appearance of defects during laying leads to the formation of damage initiators, proving the theoretical positions we formulated in Part 1. The reinforcement of the material with chopped carbon fiber increases the strength of the shell on the whole by 32-40%. It has been shown that shell products are sensitive to the methods of filament placement. The difference in mechanical properties in the filament-laying planes limits the load capacity of shells in the form of tanks; from this point of view, the problem of determining equivalent characteristics based on mechanical tests of product demonstrators is relevant. The failure of demonstrators of axisymmetric shells obtained by additive processes occurs ring-like, with crack openings in interlayer spaces. The presence of a cellular interlayer has no significant effect on the mechanism of damage development. It was also found that the working load growth rate determines the number of defects that develop and form cracks. Slow load growth forms larger initial cracks, but the latter develops more slowly. It is shown that a sealing film, even of a small thickness, applied to the side exposed to thermobaric load significantly increases the tank fracture resistance since it prevents the development of initial damage and the change of cracks into main cracks. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
49. Process optimization for short carbon fiber polyetherimide composite mold.
- Author
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Jing, Xishuang, An, Jiuzhi, Xie, Fubao, Zhang, Chengyang, and Chen, Siyu
- Subjects
- *
FIBROUS composites , *PROCESS optimization , *COMPOSITE construction , *COMPOSITE plates , *CARBON nanotubes , *POLYETHYLENEIMINE , *CARBON fibers - Abstract
With the high precision requirements and the trend of large-scale composite parts, the development of composite molds is imminent. The short carbon fiber (SCF) composite mold is mainly prepared by the technological process flow of composite sheet injection, the bonding of composite plates, and machining. However, the current process optimization method has not matured adequately, and there are still many shortcomings, for example, low precision and high cost. In this paper, the optimization method of SCF/polyetherimide (PEI) composite molds is proposed. Many experiments have been conducted, and the results show that the coefficient of thermal expansion of composite samples can be effectively reduced and the mechanical properties can be improved by optimizing the SCF weight ratio and carbon fiber length. The bonding strength of composite joints in a high-temperature environment can be improved by optimizing the bonding process parameters and modification by carbon nanotubes. Based on the above optimization method, the SCF/PEI composite mold is prepared, and the C-shaped beam composite part is fabricated by using this mold. Compared with the part made by aluminum mold, the shape accuracy of the C-shaped beam composite part is proven high through digital measurement technology. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
50. Contemporary Concepts of Adhesive Cementation of Glass-Fiber Posts: A Narrative Review.
- Author
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Tsolomitis, Panayiotis, Diamantopoulou, Sofia, and Papazoglou, Efstratios
- Subjects
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ADHESIVE cements , *PIT & fissure sealants (Dentistry) , *GLASS fibers , *DENTAL pulp cavities , *ADHESIVES , *ASEPSIS & antisepsis , *DENTAL acid etching - Abstract
(1) Background: Cementation of glass fiber posts to root canals has been associated with various failures, especially debonding. This narrative review aims to present the contemporary concepts concerning the adhesive cementation of glass fiber post and to discuss the optimal management of these factors. (2) Methods: Electronic search was performed in MEDLINE/Pub Med and Google Scholar using selected keywords examining the parameters post length, surface treatment of glass fiber posts, post space preparation and dentin pretreatment, resin cement selection, adhesive systems and hybrid layer formation, and clinical techniques. (3) Results: The search led to the selection of 44 articles. Epoxy resin-based endodontic sealers are recommended and the use of temporary cement in the root canal should be avoided. The minimum length of a glass fiber post adhesively cemented to a root canal is 5 mm. Irrigating the root canals with chlorhexidine, MTAD, or EDTA (alone or in combination with NaOCl) after post space preparation seems to enhance the bond strength. Silane application on the surface of the post seems to be beneficial. Concerning resin cements and adhesive systems, the results were rather inconclusive. Finally, resin cement should be applied inside the root canal with an elongation tip and photoactivation should be delayed. (4) Conclusions: Contemporary concepts of adhesive cementation of glass fiber posts can indeed improve the bond between glass fiber posts, resin cement, and root canal dentin, however, evidence coming from long-term randomized prospective clinical trials is needed in order to obtain safer conclusions. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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