The StepDisplacer seems not to depend on the time step (time step for the first
iteration is smaller but displacement increment is always the same). Why?
Because it was coded to apply prescribed displacement in one step
(regardless of dt); otherwise use TranslationEngine, or just prescribe
state.vel.
The output starts with the second iteration. Why?
See PeriodicEngine.initRun attrubute (false by default)
Can I use UniaxialStrainer as well for such tests?
Yes, also consider LawTester (does not support rotations, but you can
prescribe normal and shear paths).
By the way, are there some simple scripts for such tests available? It would
be great to have something with a simpler materials.
scripts/tests/law-tester.py for inspiration
Cheers, v.
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