User Defined Force with time and displacement domain variables..
I'm attempting to model a stack of PZT elements undergoing compression.
Stage 1: Compression Linearly bases on material Modulus of Elasticity open circuit Eo, (could use a spring... BUT)
Stage 2: Circuit closes, ~ 40% to 50% of the load is suddenly released, Modulus is now lower Ec
Stage 3: Compression is mechanically released back to pre-load
Cycle starts again..
I know my timing, to have switch a sudden change in load for a User Defined Force Motor
I can add a measure my displacement to use a User Defined Force Motor to act like a spring and only provide force if no separation between components.
But, how can I do both at the same time?
User defined force motor seems to only be able to use one Domain variable to control the force equation.
Is there a way to use time domain on a spring function or other work around?
I could turn on an opposing force of a constant magnitude equal to the drop in load, but, I would have to assume a displacement instead of letting the analysis find the displacement / load from the dynamic run and use it to calculate the load drop.
Can I assign U and K values for my springs using a parameter in the model, so I can modify multiple simular springs all at once?