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What is the objective of your analysis?
Are you using a simplified version of a solid fastener?
A bolt connector?
I would suggest you use a blot connectro and it will provide the loads in the fastener. Then just ensure you have the proper spacing to any edges from bolt hole center.
You high stress sound like it might be a modeling error but it depends on what the objective is.
I am modeling a flange and cover. I then appliy pressure to see if the flange can wthstand the applied pressure. I am using the bolt connector in Cosmos works. With varying answers I am nto sure which way is correct. The sample lessons from the class shows using holes fromhte hole wizard. This really increased the stress on the threaded hole edge.
What are you trying to figure out?
You need to understand what a bolt connector is. It is a beam element run down hte center of hte bolt hole and connected to the adherents with rigid bar lements. If you are trying to resolve the stresses in the adherents in close proximity to the hole your modeling approach may not be valid. If hte faster load is with in the faterener allowables and the edge distances from hole center to edge are in the right range I would bet that the stresses are not real as all the load will get taken by the inital rigid elements if they are attached to the bore which it sounds like they are. In real life and depending on the thread type (fine or coarse) the load will be distributed in the first 3 or more threads.
If this was useful can you do me a favor and add some support for my post on engineering notation to implemented in COSMOSWorks.