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[1617836513]

I'm doing a torsion test on a screw and noticed that the maximum value of the stress is in a cell at the intersection of the round hole and the threads, which seems to be a stress singularity? And zooming in on that cell, there is a single straight line from the node, just a straight line, not an edge of the tetrahedral mesh, why does this line exist? Does it make sense?

 

[1617836513]

The diagram above shows me cutting the threads and studs into two entities and sharing the topology. In the mesh model without the separation, there are no shorts in the mesh in the geometric past zone. That's why？