SolutiontoQuiz1

SolutiontoQuiz1 - 30,000 lb. If the modulus of the aluminum...

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1 EMA 3702 Mechanics of Materials Pop-up Quiz #1 Date: 9/2/11 Name: ________________________________ Panther ID:__________________________________ 1. The two portions of wood AB are glued together along a plane forming an angle with the horizontal. Knowing that the ultimate stress for the glued is 3.0 ksi in tension and 1.5 ksi in shear, determine the value of if both the shearing condition the normal-stress condition reach the same factor of safety. [6 pts.]
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2 2. An aluminum sample with a total area of 1 in 2 and an original length of 10 in is subjected to a load of
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Unformatted text preview: 30,000 lb. If the modulus of the aluminum is E = 10,000,000 psi, determine the true strain of the sample. [4 pts.] Solution: A = 1 in 2 and P = 30,000 lb. Hence Engineering stress s = P/A = 30,000 psi Engineering strain e = s/E = 30,000/10,000,000 = 3/1000 = 0.003 True strain = ln (1 + e) = ln ( 1+0.003) = 0.002996 Or elongation = = Pl/AE = (30,000 x 10)/(1 x 10,000,000) = 0.03 eng strain e = /L = 0.03/10 = 0.003 True strain = ln ( 1+e) = 0.002996...
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This note was uploaded on 12/03/2011 for the course EMA 3702 taught by Professor Wu during the Fall '11 term at FIU.

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SolutiontoQuiz1 - 30,000 lb. If the modulus of the aluminum...

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