I am trying to check someone's work.

Can someone share how to set up an FEA study for this simple part? (Maybe it isn't as easy as I think?)

I am trying to validate the force needed for a leg to fail under these conditions.

It has 750 pounds of downforce. The top plane should be restrained. How much force would be needed to have the weld joints fail?

I have attached a file if that helps.

Any help is greatly appreciated.