Problem 1 (10 points) Figure below shows a small, pressurized cylinder, attached at one end.

and loaded with a pipe wrench at the other. The internal pressure causes a tangential stress of 400

MPa and an axial stress of 200 MPa. The pipe wrench superimposes a bending stress of 100 MPa

and a torsional stress of 200 MPa at point A.

a) Determine the principal stresses of the state of stress at point A.

b) Your boss suggested that since the maximum applied stress is about 400 MPa, you should

use a high strength steel with yield stress of 450 MPa. Will you follow his/her suggestion?

Why, or why not?