quiz7 - sm value. The and so crack C is the least likely to...

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Question 1 2 out of 2 points Which of the following crack configurations is the most likely to fail under an applied tensile stress (as shown). The length dimension of each of these defects is given; Assume ρ t is equal to 10 μ m for all cracks except for C ( ρ t =100 μ m) Answer Selected Answer: Crack E Correct Answer: Crack E Response Feedback: Correct. Crack E will fail first because it has the highest magnified stress σ
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The a values for each crack are shown. Remember, a = L for external cracks and a=L/2 for internal cracks. Given ρ in all samples (except C), the largest
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Unformatted text preview: sm value. The and so crack C is the least likely to fail. Question 2 2 out of 2 points A specimen of a 4340 steel alloy having a plane strain fracture toughness of 45 MPa m. It is known that the largest surface crack in this specimen is 0.75 mm long. What is the maximum stress this specimen can tolerate without fracturing. Assume that the parameter Y has a value of 1.0. Answer Selected Answer: 927 MPa Correct Answer: 927 MPa Respon se Feedbac k: Correct You must calculate the critical stress,...
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This document was uploaded on 10/26/2011 for the course ENGL 250 at Iowa State.

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quiz7 - sm value. The and so crack C is the least likely to...

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