Hi,
I set up an elasto-plastic study of a strut that is gradually squashed using an enforced displacement.
I did not know when things would get interesting and so applied a very long time history and monitored graph of reaction forces as Pass 1 iterations developed.
After 250 steps (of 500) the load levelled off (buckling).
Rather than allowing the study to run to the full 500 steps it is always quicker to stop the study and restart with fewer time steps.
I restarted as a new study (so I can keep the earlier results) with the same time history truncated to only 250 time steps. No other changes.
My expectation would be that the number of iterations and the residual norms would be the same as the previous study.
The 0th (no load) Pass 1 iteration is identical to the study I stopped.
Every subsequent Pass 1 time step has different residual norms and sometimes different numbers of iterations.
Why?
Thanks
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