Hex Mesh

Dear all,

Recently I have been running a simulation in ABAQUS, which is the compression of two hemispheres. The two hemispheres are identical, and I think the simulation results of the contact sufaces of the two hemispheres should be identical too. However, I found when I apply only elastic material property, the result is alright, when I change the material property to elastic-plastic (bi-linear), the result is very wierd (the contact sufaces are not symmetric). All of the model is with HEX mesh, when TET mesh is applied there is no such issues.

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