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Micromechanics-based evaluation of the poroelastic effect and stress concentration in thermochemically-decomposed composites

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Abstract

The poroelastic effect and stress concentration of thermochemically decomposed composites are evaluated based on micromechanics. Considering the pore shapes and array patterns, representative volume elements (RVEs) of homogenized composites are modeled and analyzed using a finite element method. The effects of porosity and material anisotropy are carefully investigated. The poroelastic parameters are calculated based on the pore-pressure-induced strain and effective elastic moduli as well as on the differences between the elastic moduli of solid-skeleton composites and porous composites. The strain energy density is measured to evaluate the microstress concentration caused by pore pressure. Moreover, the effects of constituent phases on the poroelastic parameters and strain energy density are examined by improving the RVE models for heterogeneous composites. The usefulness of the calculation method for poroelastic parameters is investigated through numerical experiments.

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Correspondence to Eui Sup Shin.

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Recommended by Associate Editor Kyeongsik Woo

Sung Jun Kim received his B.S. and M.S. degrees in Aerospace Engineering from Chonbuk National University in 2007 and 2009, respectively. He is now a Ph.D candidate, and his research areas include thermo-pore-elastic modeling and analysis of ablative composite materials, etc.

Su Yeon Han received her B.S. degree in Material Engineering from Chonbuk National University in 2006. She is currently pursuing an M.S. degree. Her research areas and fields of interest include thermo-pore-elastic modeling and analysis of ablative composite materials, etc.

Eui Sup Shin received his B.S., M.S., and Ph.D degrees from Seoul National University in 1990, 1992, and 1996, respectively. He is now an associate professor at the Department of Aerospace Engineering, Chonbuk National University. His fields of interest include finite element analysis of structures, etc.

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Kim, S.J., Han, S.Y. & Shin, E.S. Micromechanics-based evaluation of the poroelastic effect and stress concentration in thermochemically-decomposed composites. J Mech Sci Technol 27, 3139–3147 (2013). https://doi.org/10.1007/s12206-013-0834-z

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  • DOI: https://doi.org/10.1007/s12206-013-0834-z

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