As Peter mentioned, the direction of loading can get messy at large interference which poses convergence issues unlike in displacement loading case where the direction of loading is consistent.nTwo additional suggestions that I have:nUse Normal Lagrange formulation (this does not use contact stiffness so that option disappears)nChange contact detection to Nodal Normal to Target since the target surface remains relatively flat.nRegarding the interface treatment, Ramped Effects increments the total interference over the time steps so the load is applied gradually as recommended in any nonlinear FE simulation. If you set it to No Ramping, the solver tries to resolve the full interference in the very first sub-step which causes convergence issues.nWith Adjust to touch, the contact detection points (which are not the same as nodes) are offset such that the interference between the two surfaces is zero. The nodes are not physically moved so you may still see some geometry penetration but the contact forces will be calculated assuming there's no interference. It's a crude explanation but I hope it helps paint the picture.nCheck out this video from the time I indicated, it explains the difference between these options.n
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