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What determines the sign/direction of shear stress?

  1. Oct 17, 2015 #1
    What determines the sign/direction of shear stress arrows in Mohr's circle? Please see pictures below. Why are the shear stress arrows drawn the way it is and not in the opposite directions?

  2. jcsd
  3. Oct 22, 2015 #2
    I agree with you. It seems to me that they are drawn in the wrong directions.

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