Constant Displacement Compression Simulation

[captainhog]

Hello for the first time everyone...this is my first post here!

I am using Cosmos 2008 sp3 and I am trying to simulate compression testing where there is a constant displacement. The first couple of simulations I completed were nonlinear because the object goes beyond its yield strength and undergoes permanent deformation. I applied restraints and force and was able to obtain a graph with reasonable results. However, I can only seem to apply a constant force so the rate of displacement varies over the simulation.

I am basically trying to simulate one of those compression testing machines that has a constant strain rate.

Any help would be greatly appreciated.

Thanks in advance,

Captainhog

 

[captainhog]

Ok, I found that I can add a new restraint with type set to use reference geometry and choose it to vary with time and set the curve so that is linear over the simulation.

This accomplishes what I want to a point, I am now trying to create a plot of Force (N) vs Displacement (mm) but I cannot figure out how to achieve this. Any suggestions?