I'm at a total loss! Attempting to run a simulation of a simplified engine block. Basically two parts bolted together on which to put a bolt preload and a bearing force. The parts are glued together.
In this simulation I only have the bolt preload (40Kn) applied. The bolt is made using the standard CBAR and RBE3 elements. Mesh around the "affected" area has been sized down to 0,5mm using mesh control. For some reason I keep getting extremely high stress peaks around the head of the bolt.
What could I change to prevent these peaks?
It looks like your RBE3 only connect to the edge of the hole. If so, the stress will keep increasing as the mesh size decreases.
You should split the face around the head to define a washer contact patch, then connect the RBE3 from the CBAR to all of the nodes on the patch face.
So I split the face to create 17mm wahser contact patch. However with the bolt spider connected to that I still got similair results. Tried it with both a CTETRA mesh and using a CQUAD8 shell (with several different materials assigned) on the washer patch.
Any other suggestions that might fix this?