John Doyle
Ansys Employee

Additional tips:

1. Compare the two solve.out files CPT215 vs SOLID18x to assertain what the differences are in terms of convergence success/failure.

2. Run semi implicit solver.  See 'SEMIIMPLICIT' APDL command for details.  This technology is exposed in Mechanical GUI under Analysis settings.

3. Run Arc Length Method.  See 'ARCLEN' APDL command for details.  This technology would require a command object under Static Environment, to be executed jsut prior to solve.