Reply To: About convergence issue of simple 3D model applied large deflection option

[peteroznewman]

Was that force convergence plot from the run with the Minimum Substeps set to 1000?

Next you should look at the last converged substep. We can see the time is about 0.11 which is the fraction of the 4 mm total displacement or 0.44 mm that the top plate moved before elements became too highly distorted to continue the simulation.  I suggest you change the displacement of step 1 to 1 mm and add a second for 2 mm, and so on.  Keep the initial and minimum substeps at 1000 for step 1. Does the simulation get any further down? 

From the error message, you have an element number to look at. Create a Named Selection so you can isolate that element and watch how it deforms over the time steps that converged.

In the unconverged displacement plot, I see some elements along the center axis seem to have buckled. Are the nodes staying on the two symmetry planes you defined? Change the contour option to Capped Isosurface so you can see the elements that had displacement > 0.1.