I am using crystal plasticity umat written by Huang. but when I set the rate sensivity component n=200(or m=0.005), the ABAQUS can not solve it and give me some error like this.
SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE
PART-1-1.320 D.O.F. 2 RATIO = 1.07695E+13.
ELEMENTS ARE DISTORTING EXCESSIVELY. CONVERGENCE IS JUDGED UNLIKELY.
I think it is because we have small number with high value power and it cause singularity.
I should say that it is work fine for small n(10 or 20)
Please help me.