03-01ChapGere.0004

# 03-01ChapGere.0004 - d 5 0.625 in. Also, the distance from...

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Problem 3.3-2 When drilling a hole in a table leg, a furniture maker uses a hand-operated drill (see figure) with a bit of diameter d 5 4.0 mm. (a) If the resisting torque supplied by the table leg is equal to 0.3 N ? m, what is the maximum shear stress in the drill bit? (b) If the shear modulus of elasticity of the steel is G 5 75 GPa, what is the rate of twist of the drill bit (degrees per meter)? 184 CHAPTER 3 Torsion Circular Bars and Tubes Problem 3.3-1 A prospector uses a hand-powered winch (see figure) to raise a bucket of ore in his mine shaft. The axle of the winch is a steel rod of diameter
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Unformatted text preview: d 5 0.625 in. Also, the distance from the center of the axle to the center of the lifting rope is b 5 4.0 in. If the weight of the loaded bucket is W 5 100 lb, what is the maximum shear stress in the axle due to torsion? Solution 3.3-1 Hand-powered winch b d P W W d 5 0.625 in. b 5 4.0 in. W 5 100 lb Torque T applied to the axle: T 5 Wb 5 400 lb-in. M AXIMUM SHEAR STRESS IN THE AXLE From Eq. (3-12): t max 5 8,340 psi t max 5 (16)(400 lb-in) p (0.625in.) 3 t max 5 16 T p d 3 b d W Axle d A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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## This note was uploaded on 09/20/2009 for the course COE 3001 taught by Professor Armanios during the Spring '08 term at Georgia Institute of Technology.

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