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Question: problem 2 a rocket case 260in diameter and 073in wall...

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Problem 2: A rocket case, 260-in diameter and 0.73-in wall thickness was manufactured from steel with Sv- 240 ksi and fracture toughness Kc- 79.6 kpsi-ins. Even though it was designed to withstand 960 psi, the rocket case catastrophically failed at 542 psi. This implies that the failure was due to a small crack (smaller than the wall thickness) as shown exaggeratedly in the figure. Estimate the size of the crack that caused it to explode.

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