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Question 11.12: The closed section thin-walled beam shown in Fig. P.11.12 is...

he closed section thin-walled beam shown in Fig. P.11.12 is subjected to a torque of 4.5 kNm. For the curved wall 12 the thickness is 2 mm and the shear modulus is 22000 N/mm². For the walls 23, 34 and 41 the corresponding figures are 1.6 mm and 27500 N/mm². (Note: Gt = constant). Calculate the rate of twist of the beam section.

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