A Plastic Fracture Mechanics Prediction of Fracture Instability in a Circumferentially Cracked Pipe in Bending—Part I: J-Integral Analysis

[+] Author and Article Information
A. Zahoor

Fracture Proof Design Corporation, St. Louis, Mo. 63108; Battelle Columbus Laboratories, Columbus, Ohio 43201

M. F. Kanninen

Battelle Columbus Laboratories, Columbus, Ohio 43201

J. Pressure Vessel Technol 103(4), 352-358 (Nov 01, 1981) (7 pages) doi:10.1115/1.3263413 History: Received July 17, 1980; Revised June 08, 1981; Online November 05, 2009


A method of evaluating the J-integral for a circumferentially cracked pipe in bending is proposed. The method allows a J-resistance curve to be evaluated directly from the load-displacement record obtained in a pipe fracture experiment. This method also permits an analysis for fracture instability in a circumferential crack growth using a J-resistance curve and the tearing modulus parameter. The influence of the system compliance on fracture instability is discussed in conjunction with the latter application. The results suggest that a compliant piping system containing a crack can exhibit ductile fracture instability after some stable crack growth. The importance of using a J-resistance curve that is consistent with the type of constraint for a given application is emphasized.

Copyright © 1981 by ASME
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