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mohr coulomb criteria?

Question asked by Pascal Bigot on Jul 2, 2012
Latest reply on Jul 2, 2012 by Pascal Bigot

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

essai mohr-coulomb1.JPG

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:

essai mohr-coulomb2.JPG

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:

essai mohr-coulomb3.JPG

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?