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k,db2 0.282 x 10 x 10~2 x (2.5 x 10"2)2 = 0.057 x 106r

Torsion of Non-circular and Thin-walled Sections (d) Equal-leg angle section

Perimeter of angle = perimeter of tube = In x 20 x 10"3 m Length of side d — 20n x 10~3 m Therefore applying eqn. (5.12), e _ 3 T

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