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I made a FBD and calculated reaction forces, moment, shear, and bending. However, I am stuck with the torsion or torque. I don't know which one it is. I believe it is torque since the whole axle is one piece. How do i determine the torque given

diameter of wheel = 20in

axle is driven at a constant speed of 3 ft/s

friction coeff = 0.3

I will be using von-mises afterwards to determine the proper diameter of the axle.

Please see attached picture.

Thank you.

Can't seem to get picture to work, but here is an imjur link. http://imgur.com/a/HHmgn