35-3. A 20-mm square has been scribed on the side of a large steel pressure vessel. After pressurization, the biaxial stress condition of the square is as shown. Determine the percent change in the slope of the diagonal DB due to the pressurization of the vessel. Use 0.30 for the Poisson's ratio and the modulus of elasticity for the material is 200 GPa. Equation 10-18 may be helpful here. (ANS: -0.05196%) 20 mm D = 80 MPa B σ,160 MPa Fig. 35-3 -20 mm- 35-4. An elastomeric bearing (G = 0.9 MPa) is used to support a bridge girder as shown to provide flexibility during earthquakes. The beam must not displace more than 10 mm when a 22-kN lateral load is applied as shown. Knowing that the maximum allowable shearing stress is 420 kPa, determine (a) the smallest allowable dimension b, (b) the smallest required thickness a. (ANS: 262 mm, 19.85 mm) 2 P 200 mm Fig. 35-4