FE modelling of deformation localization in metallic foams
In this paper, we employ a modified and representative unit cell model to study the crush behaviour of closed-cell metallic foams with varying spatial density distribution. The mean through-thickness density variation was assumed to be a function of the casting process of the foam, while the in-plane variation was assumed to follow a statistical probability distribution of the Gaussian type. A multiple cell finite element model, utilizing the modified unit cell, was developed. The model exhibits deformation localization patterns similar to those observed in compression testing for both transverse and in-plane crushing. The nominal ?? curve obtained from quasistatic crushing of the foam was compared with experimental findings and was found to be in good agreement only if the appropriate density distribution is taken into account.
localization foam cellular material discrete gaussian distribution