I have a 3D DCB specimen and am modeling the delamination using the Bi-linear CZM Law. I am trying to match the load-displacement graph obtained from ANSYS with that from experiment. In trying to do so, I am trying to find the correct cohesive zone parameters. When I use a high value of the "normal displacement jump at the completion of debonding" (C2), which is anything greater than or equal to .1 mm, the solution converges, but the load-displacement curve is all wrong. However, when I lower the value to something like .095 mm or lower, the solution doesn't converge. I do, however, get partial results that looks much better. Here are the errors I receive:
I have tried the following things to make my solution converge:
-increased the sub-steps, here are my settings:
-Refined the mesh at contact regions using contact sizing (I'm not really sure how much I should refine my mesh, it's possible I just haven't done it enough)
- lowered the stiffness of the contacts
- reduced the penetration tolerance
-used the normal lagrange formulation
What else can I do?
Note: I've tried to find the "contact destabilization factor" option under the Advanced contact settings, but haven't been able to find it. Is this option no longer available in ANSYS 19.2?