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Hi, I am trying to model Aluminium crushable foam (porosity 8%) in impact analysis problem using RADIOSS block120. I am using LAW 33 visco-elasto-plastic material model and P14_Solid property brick elements (ISOLID =12, ISMSTR = 2, ICPR=2). I am however getting severe element distortion of foam elements, leading to reduced time step and ultimately resulting in "Zero or negative volume error". How can I resolve this. Am I using the correct material model and property? Please help me. This is very very critical for my analysis. Also, I need help in the interface definition between the soft foam material and rigid aluminum solid part touching it. What parameters to use for defining such a contact? Thanks.