I am trying to model the strain-softening behavior of rock mass using UMAT subroutine. And, I am applying the 'static Riks method'. My model is running fine in abaqus under small loading. However, when comparatively large loading is applied the analysis is being aborted after 18% load application with an error msg, 'THE SOLUTION APPEARS TO BE DIVERGING. CONVERGENCE IS JUDGED UNLIKELY'.
I have checked the .msg file, .log file and the UMAT subroutine file, but could not find any thing helpful.
Kindly give me some suggestions for solving this problem.
Regards, Dipaloke
Dear Dr. Chunguang Li,
According to my knowledge, the 'Static Riks method' in Abaqus uses the 'arc length method' which I am already using (mentioned in the above question). However, still my program is aborting at around 19% LPF.
Regards,
Dipaloke
Chunguang Li ,
Both geometrical and material non-linearity are present in my model.
I think you turn off one of the two nonlinear types，then check which one is the main reason.
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