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## Homework Statement

A hollow shaft has torque being applied on both sides. The angle of twist is 50 degrees, the diameter is 100 mm, the thickness t has 5 mm. We are given that the allowable stress is 120 MPa, and the allowable shear stress is 50 MPa.

We are asked to solve for the maximum torque.

I know I will have to calculate for the torque using two equations and I will have to compare the answers. I will find torque using the max stress and i will find torque using the maximum shear stress.

At first:

I used, Shear stress (max) = Tr/J

J = TT/2 * (ro^4 - ri^4)

I get the wrong answer.. I am wondering what the relation is with Torque and Angle of twist

I know, theta = TL/JG . But I'm not given L, and not told what material I have, so G is unknown.

Thank you for all the help!