jj77, I expect the solver may fail to converge before reaching 2000 rad/sec due to a plastic hinge. The model I ran above ramps the rotational velocity from 0 to 200 rad/sec in 100 seconds in step 1, so at 17 seconds when the solver fails to converge, the rotational velocity is only 34 radians/sec (I edited the post above when I realized I didn't use 100 rad/sec at 100 seconds as I had assumed). At that time, the material is still in the elastic range according to the stress result so there is zero plastic strain. That's the same as having no material nl.
I changed the mesh to have six elements across the belt and rib where before I had only four elements. The solver is running now, but has already gone further than it did before. That is what I mean about convergence in that model needing smaller elements.
The motivation to get a uniform mesh along the length was because the tet mesh was too coarse to compute an accurate creep strain because the large elements did not capture the variation in stress over the cross section and since the creep rate is a function of stress, a significant error in creep strain could occur.
Regards,
Peter
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