Hi,
The Normal Contact Stiffness is the most important parameter affecting both accuracy and convergence behavior. A large value of stiffness gives better accuracy, but the problem may become more difficult to converge. If the contact stiffness is too large, the model may oscillate, with contacting surfaces bouncing off each other. We need find a balance between accuracy and allowable penetration. When any model is facing the convergence issue, and if it is because of high residuals at contact location, so we reduce the contact stiffness to reduce the contact force(penetration will be increased) and achieve the convergence.
Linear Tet elements are stiffer, so may because of that you might be getting high contact pressure. You can try with higher order tet elements with fine mesh and see if you can get similar results as hex elements.
Thank you,
Akshay Maniyar
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