The ring in Figure P9.27 has an inside diameter of 100 mm, an outside diameter of 180 mm,...

The ring in Figure P9.27 has an inside diameter of 100 mm, an outside diameter of 180 mm, and a circular cross section. The ring is made of steel having a yield stress of Y = 520 MPa. Determine the maximum allowable magnitude of P if the ring has been designed with a factor of safety SF = l.75 against initiation of yielding.

FIGURE P9.27