Torsion spring

i want to model a torsion spring, which create torsion in only cloclwise and freed in other direction, how to c

reate

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HyperMesh

Assuming that you're using OptiStruct you can create a spring CBUSH and associate a PBUSH property.

Imsode the PBUSH you are able to add a nonlinear curve (TABLED1) in the PBUSHT field for the rotational DOF.

The TABLED1 you can create a force x displacement curve and add a stopper in CCW.

Please take a look at OptiStruct documentation and look after PBUSH/PBUSHT

By the way, this is a nonlinear model, so you need to run a nonlinear static loadcase.

Here an example, using PBUSH1D. It is considering translational DOF, but the isea is the same.

thank you sir