I'm trying to model the stresses on a plate used in part of a crane. It's a triangular plate with 1 hole at the top end and two at the bottom.

Attempting to make the simulation as realistic as possible I created the assembly with the pins that connect through the holes in the plate. Setting the component contactss to no penetration, since bonded would be unrealistic I'd imagine?

The only problem is, along with extremely long simulation times for simple geometry, that it seems the higher the mesh density of the mesh control I apply around the holes, the more the von mises stress seems to tend off towards infinity.

Am I doing something wrong here? Any advice for modelling this situation would be great.