15 Replies Latest reply on Nov 26, 2015 7:27 AM by Stephen Callegari

    Torsion in rectangular bar

    Stephen Callegari

      I am trying to calculate the torsion in a rectangular bar.

      I have found closed form calculations in Shigley, Roark, and a NZ structural code which all agree (within 10% or less).

      However, the solid works simulation of the same geometry is higher:


      b = 4"

      t = 1"

      L = 3"

      T = 10,000 in*lbf


      Tau (Shigley) = 8.63 ksi

      Tau (Roark) = 8.63 ksi

      Tau (NZS 4404) ~9 ksi

      Tau (FEA) = 11.65 ksi


      The FEA results are 35% higher.

      Has anyone every experienced this


      Results are attached below: