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Dieter_HW_ Set_ 6_key

# Dieter_HW_ Set_ 6_key - σ = Pd/2t where P = internal...

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Dieter Exercise 8.18 Compare steels A and B for the construction of a pressure vessel 30 inch inside diameter and 12 feet long. The pressure vessel must withstand an internal pressure of 5000 psi. Design against a radial internal flaw of length 2a. Use a safety factor of 2. For each steel, determine [a] critical flaw size (yield before break) and [b] flaw size for a leak-before-break condition. Pressure vessel circumferential [hoop] stress,

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Unformatted text preview: σ = Pd/2t where P = internal pressure, d = vessel diameter, t = wall thickness σ (allowed) = σ y /2; t = 5000*30/ σ y a cr related to plane strain fracture toughness, K 1c = ασ [ π a cr ] 1/2 α not provided; assuming same for A and B [equals 1, a terrible assumption]. .. [a] a cr = [K 1c / σ a ] 2 / π [b] for leak before break, 2a cr = t Steel A cannot be used in a “leak before break” application, steel B can. ......
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Dieter_HW_ Set_ 6_key - σ = Pd/2t where P = internal...

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