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Guest posted a topic in Altair RADIOSSHi, I am trying a simple impact analysis like radioss example 26 ruptured plate ( I am not interested in the rupture, just want to try an impact problem). I am using a soft non linear material M36_PLAS_TAB with a stress strain curve (E=8Mpa,nu=0.42,rho=1.412e-6Mg) and fixing the whole bottom surface. I used the volume tetra mesh to mesh my disk. ( I am using solid elements instead of shells as a basis for a more complex problem I am working on) The model was working fine with linear elastic materials... I read a few posts about this problem. There it was suggested to use a really thin linear elastic surface on top. And to change the element formulation. Could you please elaborate more in detail the steps to overcome this problem? Thanks!