Abstract
The hydrostatic compaction of composites comprising a closely-packed particle-bed filled by a dense matrix is measured experimentally using a fluid-pressurization apparatus. A highly compliant polymer or pure aluminium are infiltrated into preforms of packed alumina particles containing between ≈ 56 and ≈ 63 vol pct reinforcement. With the compliant matrix data show a non-linear response. This is rationalized using a simple model of compressive granular media elasticity based on the Hertz-Mindlin model. Bulk moduli for the aluminium matrix composites are found to be relatively constant; comparison with theory shows that, unlike what is observed for deformation involving shear, in hydrostatic elastic compression the classical self-consistent model describes best measured modulus values for this class of composite.
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