A numerical solution to accurately predict deformation behaviour of metallic foam material up-to densification region for the possible use in composite structures

Abstract

Closed cell metallic foam material has immense potential to use it as core material in composite structures. In the design of such structures and to understand numerically its deformation behaviour there is a difficulty of choosing the correct constitutive behaviour of metallic foam due to its porous structure. A solution has been proposed to accurately predict the experimental behavior of a closed-cell metallic foam up-to densification region by the use of a crushable foam model under compressive loading condition. The effect of using different stress-strain material curves and other input parameters of the crushable foam model is quantified in terms of predicting experimentally determined compressive load-displacement behavior of the metallic foam. It has been found that for predicting accurate compressive behavior of metallic foam using a crushable foam model, the hardening behavior of metallic foam may be defined by engineering stress vs. true strain values.