03-01ChapGere.0001

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181 Torsional Deformations Problem 3.2-1 A copper rod of length L 5 18.0 in. is to be twisted by torques T (see figure) until the angle of rotation between the ends of the rod is 3.0°. If the allowable shear strain in the copper is 0.0006 rad, what is the maximum permissible diameter of the rod? Solution 3.2-1 Copper rod in torsion 3 Torsion L 5 18.0 in. g allow 5 0.0006 rad Find d max 5 0.05236 rad f 5 3.0 85 (3.0) ¢ p 180 rad From Eq. (3-3): d max 5 0.413 in. d max 5 2 L g allow f 5 (2)(18.0 in.)(0.0006 rad) 0.05236 rad g max 5 r f L 5 d f 2 L L d TT L d Problem 3.2-2 A plastic bar of diameter d 5 50 mm is to be twisted by torques T (see figure) until the angle of rotation between the ends of the
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