Elasticity of Random Multiphase Materials: Percolation of the Stiffness Tensor
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10955_2015_Article_1387.pdf
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3.19 MB
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67855f274156a81790ec051848d3b439
Author(s)
Chen, Ying
Schuh, Christopher A
Date Issued
October 2015
Journal
Journal of Statistical Physics
Publisher
Springer US
Citation
Chen, Ying, and Christopher A. Schuh. “Elasticity of Random Multiphase Materials: Percolation of the Stiffness Tensor.” Journal of Statistical Physics 162.1 (2016): 232–241.
Version
Author's final manuscript
Abstract
Topology and percolation effects play an important role in heterogeneous materials, but have rarely been studied for higher-order tensor properties. We explore the effective elastic properties of random multiphase materials using a combination of continuum computational simulations and analytical theories. The effective shear and bulk moduli of a class of symmetric-cell random composites with high phase contrasts are determined, and reveal shortcomings of classical homogenization theories in predicting elastic properties of percolating systems. The effective shear modulus exhibits typical percolation behavior, but with its percolation threshold shifting with the contrast in phase bulk moduli. On the contrary, the effective bulk modulus does not exhibit intrinsic percolation but does show an apparent or extrinsic percolation transition due to cross effects between shear and bulk moduli. We also propose an empirical approach for bridging percolation and homogenization theories and predicting the effective shear and bulk moduli in a manner consistent with the simulations.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1007/s10955-015-1387-6
