Solution 3.3-2Torsion of a drill bitProblem 3.3-3While removing a wheel to change a tire, adriver applies forces P525 lb at the ends of two of the arms of a lug wrench (see figure). The wrench is made of steel withshear modulus of elasticity G511.43106psi. Each arm of thewrench is 9.0 in. long and has a solid circular cross section ofdiameter d50.5 in. (a) Determine the maximum shear stress in the arm that isturning the lug nut (arm A). (b) Determine the angle of twist (in degrees) of this samearm.Solution 3.3-3Lug wrenchSECTION 3.3Circular Bars and Tubes185d54.0 mmT50.3 N?mG575 GPa(a) MAXIMUM SHEAR STRESSFrom Eq. (3-12):tmax523.8MPatmax516(0.3N ?m)p(4.0mm)3tmax516Tpd3(b) RATEOF TWIST
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