Th error message you cite is a rather typical one from ABAQUS, and to diagnose the root cause often requires the specific knowledge of your area of expertise (i.e. soil mechanics).
In any nonlinear analysis, whether it involves geometric nonlinearity (NLGEOM), contact, material nonlinearity...
I am interesting in finding published articles or other resources that pertain to use of FEA tools in the study of assemblies subject to micromotion and fretting.
My internet search has led to a few resources, primarily in aircraft applications, but I hope to find more, and with material...
