Numerical Characterization of Porous Solids and Performance Evaluation of Theoretical Models via the Precorrected-FFT Accelerated BEM

An 3-D precorrected-FFT accelerated BEM approach for the linear elastic analysis of porous solids with randomly distributed pores of arbitrary shape and size is described in this paper. Both the upper bound and the lower bound of elastic properties of solids with spherical pores are obtained using the developed fast BEM code. Effects of porosity and pore shape on the elastic properties are investigated. The performance of several theoretical models is evaluated by comparing the theoretical predictions with the numerical results. It is found that for porous solids with spherical pores, the performances of the generalized selfconsistent method and Mori-Tanaka method are comparable and are much better than that of the self-consistent method and the differential scheme. In particular, the generalized self-consistent method gives the best approximations to three elastic moduli while Mori-Tanaka method agrees particularly well with the numerical value of Poisson’s ratio.

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