Abstract
The constitutive relation of porous materials with consideration of internal pressure is theoretically studied by means of Eshelby's equivalent inclusion method and Mori–Tanaka's scheme. The effects of the internal pressure in microvoids, loading rate, relaxation time and initial modulus of matrix, porosity of the material on the constitutive relation are analysed numerically. The analytic results indicate that the effect of internal pressure in the voids on constitutive relation is significant for porous materials under the action of tensile load at low loading rate.
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