Hello,
I am performing a monotonic pushover simulation on a steel shear wall configuration. The instances (columns, sheet, and beams) are modeled using S4R elements with a relatively fine quad mesh.Surface-to-surface contact and cartesian connectors are used to model the contact. The default value of automatic stabilization is used. The configuration is pinned at the base and the loading is defined using a monotonic displacement controlled protocol (1 mm/sec for 200 seconds). Initial time increment is set as 0.001 with a max of 0.1. When the material is modeled as perfectly plastic, the analysis runs fine and the results, as far as deformed shape and stress fields go, make perfect sense. However when plastic strain/stress values are introduced (true stress and true strain, based from experiments) the analysis reaches a point (about 50%) where the time step size cuts back to a very small value (1.9e-6). No warnings are reported and the analysis has been running for about 12 hours now without aborting.
Am I missing something? I was under the impression that adding a slope to perfectly plastic material in ABAQUS actually helps with convergence issues. I have attached the input file, any help is greatly appreciated.
Thanks!
Had a similar problem. Created a model that worked pretty well when applying force to an elastic material. When I added plasticity, the model did not converged. Weird because not even the elastic domain was beeing simulated.
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