Torsional Spring

[creighbm]

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?

 

[40818]

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?

 

[creighbm]

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.