## Answers

Given data: - yield strength sigma_y = 276 MPa ultimate stress sigma_u = 310 MPa pressure P = 10.9 MPa d_b = 25 mm d_c = 20 mm To calculate the pretensioning stress = 0.75 times 276 = 207 MPa Total No. of Bolts = 8 Therefore Bolts are made of steel Therefore Critical stress in the Bolt sigma_c = sigma_P + Internal load sigma_c = 207 + 10 g sigma_c = 217.9 MPa For one Bolt sigma_c = 217.9/8 sigma_c = 27.23 MPa Hence casing are made of alluminium so thickness of thin casing should be sigma times 2(300 + 200)t = P_max (300 times 200 t = 10.9 times 300 times 200/276 times 1000 t = 2.369 mm For the safe design of casing thickness should be more than > 2.369

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