Abstract: Aimed at particulate-filled composites with high-volume-fraction and randomly distributed particles, based on a particular strain decomposition mode, the statistical regularities of strain distribution of representative volume element (RVE) under any macro-deformation loading are investigated by FEA method, the statistical regularities of the mean-value and fluctuation of strain in particle as well as in matrix to the macroscopical strain are obtained, and the equivalent bulk modulus and equivalent shear modulus of the composites are derived.

Key words: particulate-filled composite, statistic regularity of strain distribution, stiffness