A thin-walled, closed-ended metal tube with ultimate strengths in tension and compressi...

A thin-walled, closed-ended metal tube with ultimate strengths in tension and compression , outer and inner diameters D and d, respectively, is under an internal pressure of p and a torque of T. Calculate the factor of safety n according to the maximum principal stress theory. Given: = 250 MPa, = 520 MPa,D= 210 mm, d = 200 mm, p = 5 MPa, and T = 50 kN m.