A pipe with oil pressure of 3000 psi is closed by a valve so that the water is not flowing. Given a pipe inside diameter of 3 inches and a wall thickness of 0.25 inches,
a). Determine the state of stresses in the walls and indicate these stresses (including arrows to denote the direction of the stresses) on the element below.
b). Then, determine the maximum in-plane shear stress on the wall of the pipe using Mohr's Circle.