Experimental Verification of Fracture Toughness Requirement for Leak-Before-Break Performance for 155–175 ksi Strength Level Gas Cylinders

[+] Author and Article Information
M. D. Rana

Research and Development Department, Linde Division, Union Carbide Corporation, Tonawanda, N.Y. 14150

J. Pressure Vessel Technol 109(4), 435-439 (Nov 01, 1987) (5 pages) doi:10.1115/1.3264927 History: Received July 14, 1987; Online November 05, 2009


This paper deals with a determination of the fracture toughness requirement to obtain leak-before-break performance for a 155–175 ksi strength level high-pressure gas cylinder. Analytical LEFM methods along with Irwin’s K Ic -K c equation related by the parameter βIc were used to predict the fracture toughness requirement for the plane-stress fracture state problem. Experimental work was conducted on flawed cylinders to quantify the fracture toughness requirement for leak-before-break performance. The results indicated that the analytically predicted toughness requirement is 4 to 25 percent higher than that established experimentally. The results also indicated that the minimum specified K Ic (J) value of 85 ksi in. (93.5 MPam) for the gas cylinder is sufficiently higher than the analytically and experimentally established toughness values to provide the desired leak-before-break performance.

Copyright © 1987 by ASME
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