If you’ve modeled it, you might try Impact.
It’s might not even be updated. The interface is so engineering-ghetto ugly. It’s java, so you know it’s going slow, but it was easy for me to make some stuff and destroy it.
I’ve also used Code Aster, but it seems better suited for either single or assembled contrivances with well-fitted parts, notsomuch, for smashing things like tired child with a bad temper. Cases are often prepared in Salome Mecha. The .stp files from Rhino 3D import well. The results are accurate enough for France’s nuclear containment. Though, the messages are in French.
There’s also scan and solve, which I really wish I had a copy, but once again, it may be more for stress than a bit of the old press ultraviolence.
There is Elemer, but I think it’s going to pigeon-holed to be a university program.
OpenFoam has some FEA. I have not seen any results. There are rumors that someone might have --ehem encouraged them to support Windows fully.