Learning Forum

[agambhir_be20]

I'm doing a fiber push-out simulation to match the simulation result with the experimental one. When I run the simulation, the solution is not converging.  The fiber and the matrix are of SiC material bonded by czm contact debonding. I have made the model in micrometers.

The material properties are as follows

I'm trying to plot the load vs displacement graph and want to compare it with the experimental one that I have posted above. In the exp, the load at which the fiber breaks is around 56-57mN. In the simulation, I gave separation distance-based debonding in CZM and max tangential slip after debonding according to the experiment graph (the bond breaks at 57mN, so I took displacement of that point, which is 0.7um).

The result I'm getting now is that the force at which the fiber breaks is 7-8 times higher than the experiment one.

 

What could be the reason for the solution not converging? 

 

[dlooman]

Since the force is 7-8 times higher than experiment, convergence doesn't seem to be the main issue.  You've fallen into some sort of inescapable loop in which the force convergence values  are the same every third iteration.  The only way to possibly escape such a loop is to allow a smaller time step than what you have specified.  You are using displacement loading which is good for such an analysis.  Last resort is to turn on stabilization.