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Found 2 results

  1. 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.
  2. Hi, I am trying to model a problem involving crushable foam modeled using LAW33 and coarse brick elements with property as ISOLID=14, ISMSTR=1, ICPRE=2. I have defined a relative velocity between foam and a metal part, so that the metal part comes in contact with the foam. As soon as the metal part comes in contact with the foam, the foam elements encounter negative internal energy leading to "zero or negative volume" error. Please help me resolve the instability. I have attached the model for reference. Model2_Foam_Leg_Guide_0000.rad Model2_Foam_Leg_Guide_0001.rad
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