SEDL / STP / STP536-EB / STP49656S

Fracture Mechanics Technology for Optimum Pressure Vessel Design

Bjeletich, J. G.
Research scientist, Division of Lockheed Aircraft Corp., Palo Alto, Calif.

Morton, T. M.
Senior scientist, Division of Lockheed Aircraft Corp., Palo Alto, Calif.

Pages: 22    Published: Jan 1973

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Abstract

A technique has been developed to design a maximum efficiency reliable pressure vessel of given geometry and service life. The technique for ensuring reliability of the minimum weight vessel relies on the application of linear elastic fracture mechanics and fracture mechanics concepts. The resultant design incorporates potential fatigue and stress corrosion crack extension during service of a worst case initial flaw. Maximum stress for safe life is specified by the design technique, thereby minimizing weight. Ratios of pressure and toughness parameters are employed to avoid arbitrary specification of design stress level which would lead to a suboptimum design.