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Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute 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.)

Copyright of Chinese Journal of Applied Mechanics is the property of Chinese Journal of Applied Mechanics 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.)

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.)

Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology 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.)

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.)

Copyright of Journal of Zhengzhou University: Engineering Science is the property of Editorial Office of Journal of Zhengzhou University: Engineering Science 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.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics 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.)

Fiber/matrix interfaces exist in the transitional region between fiber and resin matrix in fiber reinforced composites. How to reasonably consider the interposition of interfacial phase is a critical problem in the failure analysis of composite structures. In this paper, a multi-scale finite element method is proposed based on three-phase representative volume element, by developing the microscopic failure criterion, damage degradation model and uncertainty model of material strength. The failure prediction of low temperature composite structure under thermal mechanical load is realized by the multi-scale finite element method. Moreover, the method is used to analyze the failure of composite laminates at five temperatures. The numerical predictions are in good agreement with the experimental results, which shows that the method can analyze the failure of composite structures at cryogenic temperatures effectively.

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.)

Particle reinforced metal matrix composites have complex meso-structure.The construction of its geometric model is a challenging work in the research of its mechanical properties.Through the Python language interface of the ABAQUS software, the parametric modeling of the complex mesoscopic model of particle reinforced metal matrix composites was realized and encapsulated into a plug-in.The plug-in can construct the axisymmetric unit cell model, the three-dimensional periodic unit cell model and the randomly distributed representative volume element model.The effect of zirconia toughened alumina particles (ZTA) on the mechanical properties of zirconia toughened alumina particles reinforced iron matrix composites (ZTAp/Fe45) was analyzed.The results shows that the strengthening effect of irregular polyhedral particles on the elastic modulus of the composites was greater than that of spherical particles.However, the irregular morphology of ZTA resulted in more stress concentration in the composites.With the increase of ZTA particle volume fraction, the elastic modulus of ZTAp/Fe45 composites shows an upward trend, which indicates that the elastic properties of composites can be effectively improved by adding reinforced particles.In the case of low interfacial modulus, the improvement of interfacial bonding properties can significantly improve the elastic modulus of composites.After the interfacial modulus reaches the matrix modulus, the effect of increasing interfacial modulus on the elastic modulus of composites gradually slows down.

Direct methods of plastic analysis are widely used in composites analysis to determine material strength for safety assessment or lightweight optimization design. Multi-scale processing of periodic heterogeneous composite material is needed due to its existing of microstructure. The standard method is to determine the macroscopic properties from the calculation results of microcosmic representative volume elements (RVEs) by using the homogenization theory. However, in current practice, there are some disadvantages of transforming the micro strain domain to the macro stress shakedown domain when considering multiple external loads. The domain cannot fully demonstrate the shakedown condition, and it is impossible to evaluate a known loading combination only from the knowledge of whether the load leads to the shakedown state. To overcome this disadvantage, a new comprehensive approach was proposed to enhance endurance limit strength of composites under variable loads for long term. Considering the example of in-plane strength analysis, for microcosmic RVEs, a new set of boundary condition was defined in the form of uniform strain. The boundary condition was derived from the elastic response under unit loads by using Hook’s law and stiffness matrix. The resulting elastic stress field was used later for plastic shakedown analysis. Based on the lower bound theorem of plastic mechanics, optimization programming for load factor was performed, and after proper mathematical reformulation, the conic quadratic optimization problem could be solved efficiently. Macro-stress shakedown domain can be obtained after scale-transformation of the RVE results. The bases of this stress domain are unidirectional stress in geometry space. The stress amplitude of a structure can be evaluated by this domain for determining the shakedown state in a simple and practical manner. Further, changes in the boundary condition of RVE do not affect the limit and elastic analysis. Finally, few numerical examples were presented for verification and illustration. This approach can be expanded to three dimensions and employed for more complex structures.

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics 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.)

The micro-mesoscopic morphologies of composites and component materials are characterized experimentally to study the micro-mesoscopic thermo-structural characteristics of component materials of four-directional carbon/carbon( C/C) composites. The equations of periodic temperature boundary conditions for cubic and hexagonal unit cells are derived. A representative volume element( RVE) model of fiber bundle is established. Based on the homogenization theory and periodic boundary conditions,the proposed method for predicting effective thermo-structural parameters is verified on the isotropic RVE model. The thermo-structural characteristics of different types of RVEs of fiber bundle are studied and compared with the experimental results. The results show that scanning electron microscopy( SEM) can be used to obtain the micro-mesoscopic morphologies of fiber bundle and the 4 D C/C composites. The fiber monofilaments are randomly distributed in the fiber bundle. The predicted accuracy of different RVEs of fiber bundle is analyzed by using the proposed method. The method is also suitable for predicting the effective thermo-structural properties of other composites. The effective thermo-structural parameters of fiber bundle RVE satisfy the isotropic properties in the transverse direction. [ABSTRACT FROM AUTHOR]

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.)

The macroscopic compressive mechanical properties of magnetorheological elastomers are affected by the volume ratio, morphology and external magnetic field of the components. In this paper, the static magneto- induced properties of magnetorheological elastomers under magnetic field and compression conditions are systematically studied from three aspects. Firstly, the homogenization method and RVE of Digimat were used to study the mechanical properties of magnetorheological elastomers under zero magnetic Held. Then, the magne-to-induced mechanical properties of Isotropic and anisotropic magnetorheological elastomers are studied under magnetic field. Finally, the mechanical properties of magnetorheological elastomers were studied by experimental method. The results show that the magnetic-induced compressive modulus of both the granule isotropic and the chain magnetorheological elastomers increases under magnetic field. Meanwhile, the magnetorheological effect of the magnetorheological elastomer of granule chain is greater than that of the isotropic magnetorheological elastomer. [ABSTRACT FROM AUTHOR]

Copyright of Transactions of Beijing Institute of Technology is the property of Beijing University of Technology 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.)