Leak-Before-Break: What Does It Really Mean?

[+] Author and Article Information
Gery Wilkowski

Engineering Mechanics Corporation of Columbus, 3518 Riverside Drive, Suite 202, Columbus, OH 43221e-mail: gwilkows@columbus.rr.com

J. Pressure Vessel Technol 122(3), 267-272 (Mar 05, 2000) (6 pages) doi:10.1115/1.556183 History: Received February 01, 2000; Revised March 05, 2000
Copyright © 2000 by ASME
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LEFM LBB approach by Irwin 1
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LEFM LBB model with Kobayashi surface flaw improvement
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Pellini failure analysis diagram
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Examples of failure modes at Pellini reference temperatures—(a) Service failure at NDT; (b) arrested hydrostatic burst (FTE+20F); (c) pneumatic burst at FTP
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LBB analysis from Battelle relationships using limit-load equations
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Experiment with 70-percent deep circumferential groove in a pipe under bending which exhibited load-controlled LBB behavior
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Circumferential blunt flaw LBB criterion 13
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J/T stability analysis procedure
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Circumferential through-wall-cracked TP304 pipe experiment under compliant displacement-controlled loading to validate J/T analysis 15
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Experimental records of limited instability and total instability of circumferential surface flaws in TP304 pipe
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Energy balance analysis 15 showing how surface to through-wall crack transition is predicted, as well as stability under combined load-controlled and displacement-controlled stresses
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Schematic of how to create a cracked pipe element for dynamic LBB analysis
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Illustration of pipe system used in IPIRG program to assess crack stability under seismic loading at LWR temperatures
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Comparison of cracked-pipe element analysis and pipe system experimental data from the IPIRG program 21




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