Poisson's ratio- it gets shorter and fattter when you torque it.
So this increase in diameter is largley artificial based on how solidworks solves the simulation?
As far as Poisson's--in my model it shows no change in length along the X axis despite a 0.020 increase in diameter (X & Y axis displacement graphs attached).
Stress = E x Strain & Poisson's Ratio = Strain / Strain, then shouldn't the largest increase in diameter come where stress is the highest--the fixed end of the shaft; not at the free end of the shaft where the torque is applied? Von Mises graph attached
Thank in advance for any additional insight.