Convergence in Cohesive Modeling
In addition to tuning cohesive parameters, there are still something we can do to stabilize the simulations.
- Increase the cohesive element size
- Adjust boundary conditions to make cohesive elements on the symmetry plane if possible
- Apply pinned or fixed boundary condition to the cohesive elements under compression in simulation
- No extrapolation
*Step, name=Step-1, nlgeom=YES, extrapolation=NO, inc=100
*CONTROLS, ANALYSIS=DISCONTINUOUS
- Use line search, N = 5 to 10
*CONTROLS, PARAMETERS=LINE SEARCH
5
- Release the displacement tolerance restriction (not test yet!)
*Controls, parameter=field, field=displacement
, 1.