Gere & Goodno — Applications of Plane Stress: Problem 8.2-12

8.2-12 Solve the preceding problem if the diameter is 480 mm, the pressure is 20 MPa, the yield stress in tension is 975 MPa, the yield stress in shear is 460 MPa, the factor of safety is 2.75, the modulus of elasticity is 210 GPa, Poisson’s ratio is 0.28, and the normal strain must not exceed \(1190 \times 10^{-6}\). For part (b), assume that the tank thickness is 8 mm and the measured normal strain is \(990 \times 10^{-6}\). Reference from preceding problem (8.2-11): (a) Determine the minimum permissible thickness \(t_{min}\) of the tank. (b) If the tank thickness is 8 mm and normal strain is measured at \(990 \times 10^{-6}\), what is the internal pressure in the tank at that point?