I have been modeling a simple contact simulation with coefficient of friction and with surface to surface interaction.
I have tried to solve the problem with NLGEOM ON and OFF, as well as reducing the step increments and allowing more than INC 100 (I have tried with 1000).
In the CVG file, one can read the first step goes after several increments the force residual % and displacement correction % decreases to a low value. When this happens (and when I thought that the step will be finished) I receive the following message:
***The increment size exceeds the remainder of the step and is decreased to 0.00000e+00*** ***pressure ratio (smallest/largest pressure over all contact areas) = -7.204105e-04.***
then it says job done… but not results are stored on the .frd…
I have seen a similar thread here: Contact Pair doesn't work · Issue #54 · calculix/CalculiX-Examples · GitHub
I wonder what is the real problem, since for a contact convergence issues I would expect several cut backs or rigid body motions if contact has not been established, etc… but I have even tried to add some extra constraints to get a better posed problem…not success…It is worth mentioned that I am very used to contact simulations using Abaqus but I am just starting with contacts in calculix.
Any good advise you could give here @dhondt would be highly appreciated.