申論題

Problem 1 (25%)
A cylindrical pressure vessel with flat ends is subjected to a torque T and tensile forces P. The tank has a radius r = 125 mm and the wall thickness t = 6.5 mm. The loads are T = 850 N·m, P = 400 kN, and the internal pressure p = 7.25 MPa.
Determine the maximum shear stress τ_max in the wall of the cylinder.