For the following problem, unless noted otherwise use a modulus of rigidity G of 12,000,000 psi (83 000 MPa) for steel and 4,000,000 psi (28 000 MPa) for aluminum.
If the shaft of Problem were solid, with the same outside diameter and stressed to the same maximum shear stress, what would be the angle of twist? Compute the percentage increase in torque that the solid shaft could transmit. Compute the percentage increase in weight (use a unit weight of steel of 77 kN/m3).
Problem
A hollow steel shaft has a 50-mm outside diameter and a 40-mm inside diameter. The shaft is 2 m long. Compute the angle of twist when the maximum shear stress is 52 MPa.
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