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Strong-contrast expansion correlation approximations for the effective elastic moduli of multiphase composites

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Abstract

Following the previous approach of Pham and Torquato (J Appl Phys 94:6591–6602, 2003) and Torquato (J Mech Phys Solids 45:1421–1448, 1997; Random heterogeneous media, Springer, Berlin, 2002), we derive the strong-contrast expansions for the effective elastic moduli K e,G e of d-dimensional multiphase composites. The series consists of a principal reference part and a fluctuation part (perturbation about a homogeneous reference or comparison material), which contains multi-point correlation functions that characterize the microstructure of the composite. We propose a three-point correlation approximation for the fluctuation part with an objective choice of the reference phase moduli, such that the fluctuation terms vanish. That results in the approximations for the effective elastic moduli of isotropic composites, which coincide with the well-known self-consistent and Maxwell approximations for two-phase composites having respective microstructures. Applications to some two-phase materials are given.

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  1. VAST, Institute of Mechanics, 264 Doi Can, Hanoi, Vietnam

    Duc Chinh Pham

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  1. Duc Chinh Pham
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Pham, D.C. Strong-contrast expansion correlation approximations for the effective elastic moduli of multiphase composites. Arch Appl Mech 82, 377–389 (2012). https://doi.org/10.1007/s00419-011-0562-8

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