I am trying to model a normal spring and a rotational spring to find Pcr of the system. I have attached a figure for a better understanding of my problem. (The actual problem is different than this one. This problem is just to know how to model a rotational spring in Abaqus). I am able to model a normal spring because the measurement of delta(deformation) is pretty simple in this case which is the change in the distance between two nodes. I am having trouble modeling a rotational spring at a node because I am not able to understand the proper measure of rotation. Please let me know if somebody knows anything in this regard.
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