181Torsional DeformationsProblem 3.2-1A copper rod of length L518.0 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 3.2-1Copper rod in torsion3TorsionL518.0 in.gallow50.0006 radFind dmax50.05236radf53.085(3.0)¢p180≤radFrom Eq. (3-3):dmax50.413in.dmax52Lgallowf5(2)(18.0in.)(0.0006rad)0.05236radgmax5rfL5df2LLdTTLdProblem 3.2-2A plastic bar of diameter d550 mm is to be twisted bytorques T(see figure) until the angle of rotation between the ends of the
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