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Torsional Spring

Torsional Spring

Torsional Spring

(OP)
I am trying to model a torsional spring of a defined stiffness.  My thought was to use the CBUSH element and define the stiffness in the Rz DOF (based on the way my model is setup).  When I run the model, it is as if this restraint is ignored and the deflection is huge.  Is there a better way to do this?

RE: Torsional Spring

I take it you have checked that the coincident nodes either side of the cbush are in the coordinate system that will give the stiffness in the z direction?

RE: Torsional Spring

(OP)
Yep, checked that.  I was doing some more reading and am not sure if the CBUSH element is the right way to go.  The way my model is setup the y-axis is the long axis of the spring.  Like I said before, I want the element to have a Rz stiffness so I went ahead and created CBEAMs of but for the material set the density to zero.  So far this has worked out.

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