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Help needed on adding torsional loading

Question asked by 1-J3IYAW on Feb 1, 2010
Latest reply on Feb 2, 2010 by 1-J3IYAW


I am trying to use solidworks to validate torsional stress of a solid bar with fillet (pleases see the attached snapshot).  I fixed the end of bigger diameter.


I applied a torque to the end of smaller shaft.  Now here is what I am not sure of as to how to apply the torque.  The way I did is to select the end-section of the small shaft as the "faces for torque".  and I selected the cylindrical surface of the bigger shaft for the "direction".


After running the study, the graph of the stress looks funny.  Somehow, the smaller shaft bended.  I was expecting to have twisted shaft because of the pure torsion.


Please give me the right direction.  How exactly can I get the pure torsion?


Thank you very much.