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QUANTITATIVE NDE OF THE YOUNG ' S MODULUS OF FCC POROUS METALS

The present work manifests the results of the dynamic Young's modulus, E, after cold compaction and after sintering of partially dense copper and silver compacts. For both metals, the results show that E in the porous compacts depends not only on the attained density, but also on the samples' consolidation route. For porous metals, it is demonstrated that the normalized longitudinal sound wave velocity, VL*, is more appropriate than porosity, for quantitative nondestructive evaluation (NDE) of the normalized Young's modulus, E*. The proposed model uses, VL*, to evaluate: E* ≅ [αVL*+(1−α)VL*]C(ν), where α is a constant defined from the compaction behavior, and C(ν), is a function of the Poisson’s ratio, ν. This model was further verified for the normalized Young's modulus of porous nickel compacts.