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Negative Eigenvalues due to Mesh Refinement

I will keep my post brief to begin with.


The model consists of 7 rectangular interference fits (with 2 of the surfaces in direct interference).  The model appears to be working perfectly fine at simulating the stresses induced due to the fits for a variety of mesh sizes.  Once the mesh sizing of the slave components is reduced to below 0.4 the job fails due to experiencing negative eigenvalues.


To summarize - how can mesh refinement cause cause failure in a working model?

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