Learning Forum

[Ben]

I'm using CZM model to simulate the contact debonding between Silicon and a metal contact (Ag, Cu, etc).

I'm using mode 2 separation-distance based debonding as the forces are mostly tangential. The simulation is made to match an experimental process where a stylus bumps against the metal contact and debonds it of the surface.

This is the geometry of the model, very simple as it only has 3 components.

[1shan]

Hello @Ben You might want to try a couple more things. Firstly, try increasing the artificial damping coefficient value under the CZM material property(10^-3). Debonding is generally accompanied by convergence difficulties in the Newton-Raphson solution. Artificial damping is used to stabilize the numerical solution. Secondly, you may also want to see if switching to Mode 1 debonding gets the solution to converge. Also, it looks like the metal contact will pivot against one edge of the indentation and would rotate about it. You way want to include a remote displacement at this edge with all dofs fixed except rotation about 1 axis (parallel to edge).
Regards Ishan.