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Incorrect Von Mises stress

Question asked by 1-HISDYY on Jun 2, 2009
Latest reply on Jun 3, 2009 by Robert Stupplebeen
Hi all

I have a model which is a bracket made of 8mm-thick plates and is bolted to a fixed plate by four bolts and a 1KN load on the other end .
I created four bolt connections and run the simulation. The maximum principal stresses are 96.2, 63.4 and 22.1 MPa, but the maximum resultant Von Mises stress calculated by the program is 290 MPa. I assume this should be around 90MPa. I cannot justify the jump in magnitude of stress based on Von Mises stress formula.
Could you please give me some advice in this regard?


Reza Kharrazi