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

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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 ρ 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, σ...
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quiz7 - sm value The ρ and so crack C is the least likely...

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