Nonlinear Material Analysis with different element types

[Anonymous]

I am trying to run a static stress with nonlinear material models. I am using orthotropic shell elements, isotropic shell elements and brick/tetrahedron elements. I have used orthotropic elements with isotropic shell elements successfully before but am unable to get the model to solve. I am either getting an autotm limit error where the timestep is already set quite small. A simplified model with out 3D elements has been running for 24 hours but not made any convergedon the first of 20 timesteps. 

[Andrew.Sartorelli]

Hi Zachary,

This issue may be occuring because your model is not statically stable. You may have some success if you switch over to a Mechanical Event Simulation, which is more full-feature non-linear analysis type. Do you have any surface contact in the model?
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