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An aluminium alloy member having the cross-section shown in the figure below is 3 m in length. If the shear stress is not to exceed

An aluminium alloy member having the cross-section shown in the figure below is 3 m in length. If the shear stress is not to exceed 30 MN/m 2 and the applied torque is 134 N-m, determine the required thickness, t, of metal. What is the angle of twist?

G = 28 GN/m 2 .

20mm 2t 80 mm

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