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Constitutive prediction on the variability of tensile properties due to microporosity variation

The dependence of tensile properties on microporosity variation was investigated through a constitutive prediction based on previous experimental results of A356 aluminum alloy; the microporosity on a fractured surface was measured by means of quantitative fractography. The constitutive model, which takes into account the strain rate sensitivity, accurately predicts the tensile strength and elongation of the A356 alloy. In contrast, the results of a simple constitutive prediction that ignores the strain rate sensitivity diverge considerably from the overall trend of the experimental results. The significance of strain rate sensitivity on the constitutive prediction is more remarkably increased as the strain hardening exponent decreases or as the microporosity decreases.