VCE Method of J Determination for a Pressurized Pipe Under Bending

[+] Author and Article Information
C. Y. Yang, S. S. Palusamy

Westinghouse Electric Corporation, Nuclear Technology Division, Forest Hills Site, Pittsburgh, Pa. 15230

J. Pressure Vessel Technol 105(1), 16-22 (Feb 01, 1983) (7 pages) doi:10.1115/1.3264232 History: Received May 18, 1982; Revised August 13, 1982; Online November 05, 2009


The J values for a circumferential through crack in a 4-in. (101.6-mm) schedule 80 pipe subjected to axial and bending loads were determined. The Virtual Crack Extension (VCE) method was used to compute J values. The VCE calculated J values are then compared with those obtained by the differential potential energy method and a simplified fracture analysis method. Good comparisons are observed between the results obtained from all of these three methods up to a load level well above the first yield. Advantages of using VCE method are discussed. Experimental results are presented for an identical pipe, made of 304 wrought stainless steel, containing a circumferential through-wall crack and subjected to internal pressure and external bending moment. The VCE method is used to obtain the load versus J relationship from which the initiation load is estimated using the J initiation value obtained from compact tension specimens. This value is then compared to the initiation load determined by acoustic emission measurements. These two results agree within the estimated experimental scatter.

Copyright © 1983 by ASME
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