hello sir

i am doing simulation of on PU foam same as literature. I am considering PU foam block and bottom is fixed and top rigid plate striking with velocity. I am using material modal MAT_083 in LS DYNA.

this model is based on strain rate dependent. so when i applying the velocity on plate and plate is striking so block showing unrealistic very large deformation and some time not compressing as i want. and in message file showing negative volume error. please tell me what should i do. and i already done lots of changes. but problem is same.

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