I created 3 simple assemblies, each have an identical .25 x 3 x 12 plate with a 1 inch dia disk x .10 centered on it.

All plain carbon steel. The assembly is constrained the same in all three instances with a 400 pound load on each disk. The only difference is that the .25 x 3 x 12 plate was created 3 different ways:

First one was created as an extruded part

Second one as a sheet metal part

Third one was changed to "treat as solid" in the Simulation run.

I got 3 very

differant deflections in Simulation.

My question is: Should they all not be the same?