Design parameters for the containment vessels are as

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Reference no: EM13621404

Select a steel for use in high-pressure cylindrical containment vessels for the next generation of nuclear submarines. Two steels are being considered for this application, HY-130 and HY-180, which are both martensitic steels. The material properties for these two steels are shown in the table below.

PROPERTIES HY-130 HY-180

Yield strength, ksi. 130 180

Tensile strength, ksi 150 190

K~c, ksiX/~n. 280 300

K~c in seawater, ksiX/~n. 260 180

Hypothetical cost $/lb 0.50 1.00

Design parameters for the containment vessels are as follows:

(a) Internal pressure = 5000 psi

(b) Internal diameter of cylindrical portion -- 30 in.

(d) Welded fabrication will be used. Assume that weld metal properties are the same as base metal properties.

(e) The vessel must have a factor of safety of at least 2.0 against both yielding and fracture of a 0.5-in-deep surface flaw. Assume that a/2c is 0.4.

(f) The vessels will be cycled from 0 to full design pressure (5000 psi).

(g) Inspection is such that all flaws greater than 0.05 in. can be found during fabrication. In service, the vessels will be in the forward-flooding zone of the submarine and cannot be Inspected, although they can be protected by painting.

Reference no: EM13621404

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