Papers by Keyword: Effective Properties

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Authors: Qi Chang He, H. Le Quang
Abstract: This work is concerned with a versatile and efficient model for estimating the effective moduli of isotropic composites consisting of isotropic phases whose microstructure may be of matrix-inclusion type, disordered or intermediate. This extended version of generalized self-consistent model (GSCM) is built by inserting a composite sphere embedded in an infinite unknown effective medium has the core made of the unknown effective medium and coated by the constituent phases. The volume fraction of the constituent phases in this composite sphere is the characteristic parameter of the relevant microstructure. By imposing the an energy equivalency condition, the equations thus obtained to estimate the effective bulk and shear moduli involve the microstructural parameter which turns out to be capable of describing in some sense how far a microstructure is from the host matrix/inclusion morphology
Authors: Yao Ling Xu, Hong Li Hou
Abstract: The response of electro-magneto-elastic long fiber composites containing periodically distributed reinforced phases under antiplane shear load coupled with inplane electromagnetic load is dealt with, there are three different electro-magneto-elastic materials in the unit cell (3-phase model), a rigorous analytical method is developed by using the generalized eigenstrain concept integrated with the doubly quasiperiodic Riemann boundary value problem theory. As an important application of the presented solution, the effective electro-magneto-elastic moduli are predicted and compared with the results from the generalized self-consistent method.
Authors: Anna G. Knyazeva, Olga N. Kryukova, Kirill S. Kostikov
Abstract: In this work, thermal expansion coefficient of composite is calculated on the base of the model transient zone formation between spherical inclusion and matrix. Effective properties of particle surrounded by transient zone are used when composite properties are calculated. Different models leads to qualitative results similar to each other. Quantitative results depend on sintering temperature and time, on inclusion sizes and volume part of inclusions.
Authors: Zhi Min Xie, Dong Liang Chai, Si Chi Chen, Zhi Min Wan
Abstract: Cord-rubber composites are different from the general rigid-matrix composites because of the twisted nature of cords and the large, nonlinear deformation of rubber material. The study of the effect of cord construction on their mechanical properties is essential to the improvement of the performance characteristics of rubber products. However, little work was concerned with the influence of the number of strands of cord. The present work demonstrated that influence by using nonlinear finite element analyses. The calculated results show that the effective moduli of the twisted cord reinforced composites tend to be closer to that of a single strand of cord reinforced composites when increasing the number of strands with a constant cord volume fraction. For three types of reinforcing cords, the shear stresses have a symmetric distribution and an anti-symmetric distribution in the condition of in-plane shearing and axial loading, respectively. It is also found that the minimum MISS (maximum interfacial shear stress) occurs in the case of a single strand of cord in comparison with the cases of the twisted cords, and the maximum MISS is related to the loading conditions and the number of strands.
Authors: Fabio Biscani, Yao Koutsawa, Salim Belouettar, Erasmo Carrera
Abstract: This work presents a micromechanics-based model to investigate the effective thermo-electric properties of piezoelectric composite materials. The effective thermo-electric properties are derived by considering a multi-coated ellipsoidal inhomogeneity embedded in a host material in the framework of the generalized self-consistent method (GSCM). An incremental scheme, in which the reinforcements are incrementally put in the host material, is implemented. The validation of the micromechanical model is performed with experimental data. The model proposed has a wide range of applications and can be extended to other physical properties.
Authors: Abdel Bakkali, L. Azrar, A.A. Aljinadi
Abstract: In this paper, the effective properties of magnetoelectroelastic heterogeneous materials with ellipsoidal multi-inclusions are modeled and numerically investigated. The modeling is based on the integral equation that takes into account the multi-coated effect as well as the magnetoelectroelastic interfacial operators and global and local concentration tensors. Various types and kinds of coatings can be considered. The effective properties are predicted based on various micromechanical models such as Mori-Tanaka, Self-Consistent and Incremental Self-Consistent. These properties are presented in terms of the volume fractions of the multi-coated inclusions, thicknesses of the coatings, type and kind of inclusions.
Authors: Yurii Aleksansdrovich Chumakov, Anna Georgievna Knyazeva
Abstract: Numerical investigation of stressed-strain state composite plate is carried out for the conditions of one-axial loading and nonstationary heating. The state of plane stress was assumed. Various methods had been used for the calculation of effective properties: elastic constants and thermal expansion coefficient. The influence of the coupling between thermal and mechanical processes on temperature, stress and strains fields was investigated.
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