When to consider pin bending in double shear applications

[jcs284]

I have a 5/16" pin connecting two shafts together via a loose press fit. The outer shaft has an outer diameter of 3" and an inner diameter of 0.875". The inner shaft is solid with a diameter of 0.8734".

The applied load is approximately 20 ft-lb of torque.

My question is how to approach this problem. Should I neglect the bending since the gaps are small or should I include the bending moment in? I think I'm over thinking it.

 

[BAretired]

With just 0.0016" (0.04mm) gap, I think you can assume the pin is in pure shear, so bending moment can be safely neglected.

 

[SWComposites]

the pin is well supported by the two shafts, so it is in pure shear. (unless the shaft materials significantly yield in bearing before the pin fails in shear, then there might be bending effects).