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Hello, I work on the implementation of an implicit capmodell via UMAT. I read in the handbook, that ABAQUS uses the engineering shear strain (gam = 2 eps). Up to now I am not sure, if I have to incorporate this condition for the plastic part of the material jacobian. So far I uses sigma/eps...

Thank you XERF, indeed I work with an elastplastic model. So can you explain, why non-convergence occurs? Are there any solutions?

Thank you XREF, indeed I work with an elastplastic model. So can you explain, why non-convergence occurs? Are there any solutions?

I try to implement en elasoplastic material equation in ABAQUS by using an UMAT. After the warning "NEGATIVE EIGENVALUE" ABAQUS gives an incredible large strain increment (dstran) to my UMAT. Due to the large strain increment my UMAT diverges. I think the UMAT works correctly, so there must be...