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is this a mathematic singularity?

Question asked by 1-9ERK6S on Jul 1, 2009
Latest reply on Jul 7, 2009 by Roland Schwarz
Dear Simulation experts:

I am modeling two pieces screwed together using "bolt". At the edge of the bolt head, I got high stress and the stress increases when I refine the elements in that area. Is this due to numerical singularity and can be ignored? If this is real, how can it be designed out? Thanks!