ME 323: Mechanics of Materials Quiz 12 Name: PUID: Q1 (10 points). The cylindrical pressure vessel has an inner radius of 1.25 m and a wall thickness of 20 mm. It is made from steel plates that are welded along the 45 o seam. If the pressure vessel is subjected to an internal pressure of 8 MPa, (a) Determine the axial and hoop stress (σ a and σ h ), and draw the stress element at point A. (b) Determine the three principal stresses and the absolute maximum shear stress at point A. (c) Sketch the in-plane Mohr’s circle for point A. Use Mohr’s circle to determine the normal stress (σ n ) and shear stress (τ nt ) along the seam.