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: