I am not clear about what the objective is. You are deforming the body in step 1 and then at the start of step 2 removing all constraints? If that happens the body should come back to its original undeformed position unless there is plastic deformation. You can activate and deactivate constraints at each load step (
https://www.youtube.com/watch?v=lrmxV-zWqtQ) but you need some supports to prevent rigid body motion. For example you could proceed in step one as you want and in the second step deactivate the rotational end 1 (but not all), while applying z displacement to end 2
Regards
Ishan.
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