-
Re: Increase in shaft diameter in pure torsion?
Bill McEachern Nov 24, 2010 6:41 PM (in response to Bryce Engle)Poisson's ratio- it gets shorter and fattter when you torque it.
-
Re: Increase in shaft diameter in pure torsion?
Anthony Botting Nov 25, 2010 12:19 AM (in response to Bryce Engle)It is due to linear extrapolation of the graphing algorithm. Here is a diagram showing why (from SW tech support manual).
-
expansion.png 43.4 KB
-
-
Re: Increase in shaft diameter in pure torsion?
Bryce Engle Nov 29, 2010 10:24 AM (in response to Bryce Engle)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).
Also if
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.
-
stress.jpg 69.3 KB
-
X Axis.jpg 61.2 KB
-
Y axis.jpg 59.5 KB
-