Good morning

I need for an analysis to use the Mohr Coulomb criteria.

I tried to use it on a simple case: a torque applied to a rod

I mesh and run a static analysis. And then I visualyse the criteria value of the center area

(The material use to calculate the criteria has the following properties: ultimate tensile strenght: 20MPa , ultimate compressive strenght:690MPa)

Firsly  I visualise the Von Mises security criteria distribution:

The result is coherent as it show an high coefficient in the center of the rod which decrease when we go to the periphery of the rod.

Secondly , I visualise the Mohr coulomb criteria distribution:

I can't explain the result! according to me this doesn't have any sense?!

Is there a bug in solidworks?

Can somebody help me?