I use the contour integral method in ABAQUS to calculate the J-integral of CT specimen(2D). The constitutive model is Ramberg-Osgood model, which is the deformation plasticity in ABAQUS. When the Nlgoem is Off, the J-integral is correct. However, the mesh deformation in the crack tip region is very large. When the Nlgoem is On, the analysis will terminate because of too many attempts made for this increment.
I will be appreciate that if you can help me to solve this problem.
PS:
The CT model, the the mesh deformation in the crack tip region, and the results of J-integral are shown below.
I think the reason is, because you have a stress singularity at your crack tip. If you run a non-linear simulation the local element stiffness due to deformation is updated. If the stresses are infinite or very localized this update makes problems.
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