147_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

147_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Problem 2.4-12 A rigid bar of weight W ± 800 N hangs from three equally spaced vertical wires (length L ± 150 mm, spacing a ± 50 mm): two of steel and one of aluminum. The wires also support a load P acting on the bar. The diameter of the steel wires is d s ± 2 mm, and the diameter of the aluminum wire is d a ± 4 mm. Assume E s ± 210 GPa and E a ± 70 GPa. (a) What load P allow can be supported at the midpoint of the bar ( x ± a ) if the allowable stress in the steel wires is 220 MPa and in the aluminum wire is 80 MPa? (See figure part a.) (b) What is P allow if the load is positioned at x ± a /2? (See figure part a.) (c) Repeat (b) above if the second and third wires are switched as shown in figure part b. (a) x a a P Rigid bar of weight W
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