I calculated the max shear stress in a rod and then checkedit with a simulation. It was a straight .125" diameter rodsubjected to 35 in-lb of pure torque. The torsion equation I usedwas:
Max Shear Stress = 16 * Applied Torque / (pi * rod diameter^3)
The value I got from the torsion calculation was 91 KSI but theanalysis indicated a max stress of 158 KSI. The analysis was just asimple rod fixed on one end and with the torque applied close tothe opposite end. The 158 KSI value was from the outer surface inthe middle away from either end.Clickhere for a PDF showing the basic setup.
Somehow I must have set up the analysis wrong. Any ideas on how todo it correctly? The next step is to add a flat to the shaft and Iwant to make sure the analysis is set up correctly before includingfeatures that cannot be checked with simple calculations.
Thanks,
Jeff WickhamSolidworksSimulation
Max Shear Stress = 16 * Applied Torque / (pi * rod diameter^3)
The value I got from the torsion calculation was 91 KSI but theanalysis indicated a max stress of 158 KSI. The analysis was just asimple rod fixed on one end and with the torque applied close tothe opposite end. The 158 KSI value was from the outer surface inthe middle away from either end.Clickhere for a PDF showing the basic setup.
Somehow I must have set up the analysis wrong. Any ideas on how todo it correctly? The next step is to add a flat to the shaft and Iwant to make sure the analysis is set up correctly before includingfeatures that cannot be checked with simple calculations.
Thanks,
Jeff WickhamSolidworksSimulation
