J-Integral and Tearing Modulus Estimates for Circumferentially Cracked Pipes in Torsion

[+] Author and Article Information
A. Zahoor

Novetech Corporation, Rockville, Md. 20850

J. Pressure Vessel Technol 108(4), 495-500 (Nov 01, 1986) (6 pages) doi:10.1115/1.3264819 History: Received August 24, 1984; Revised September 24, 1985; Online November 05, 2009


J -integral and tearing modulus analyses are developed for full circumference part-through cracks in pipes under torsion. The approach is based on the psuedo-potential energy interpretation of the J -integral. The paper develops estimation formula for the plastic component of the J -integral for the condition of net-section yielding in the cracked section of the pipe. The applied tearing modulus estimates are derived for deformation-controlled loading. Numerical results are presented for crack initiation and tearing instability that provide quantitative results for inferring safety of cracked nuclear piping.

Copyright © 1986 by ASME
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