I have a FE model in which a pin is constrained. In reality, the pin goes thru a soft bushing which let the pin translate 0.5" in xy plane (pin free to move in Z dir). Currently, to take the bushing into account, i'm using zero length cbush with stiffness values. Now, i would like to try a different method where i want to let the node on the pin translate 0.5" in xy plane before it starts to take any load. To acheive this, i tried gap elements (only in xy plane) with an initial gap. I have "use gaps as contact " checked in. As the reactions on the pin is not inplane, the gaps are not really working. Picture attached. Is there a easier way to acheive what i'm trying to do. Thank you very much.
I've done this in the past my making the CBUSH's stiffness nonlinear, where I define a Stiffness vs. Displacement Function.
Create the function first, I use Displacement vs. Force
On the CBUSH Property, I entered a DOF 1 Stiffness as 1.0, and then press the "Nonlinear/Freq Resp.." button, and hook the same DOF to the stiffness funtion -
When a NASTRAN nonlinear job is run, there's no stiffness until the two nodes are 2.0 apart in the CBUSH's x-direction -
Attached is the FEMAP v11.3 .modfem -
I took a similar approach to your example model, but i still have the CBUSH translating lot more than what the function defines. I have the screenshot of function and property attached. I also tried to run with finite length. Am i missing overlooking something? Thank you.