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RESEARCH PAPERS

J-Estimation Schemes for Internal Circumferential and Axial Surface Cracks in Pipe Elbows

[+] Author and Article Information
R. Mohan, A. Krishna, F. W. Brust, G. M. Wilkowski

Engineering Mechanics Department, Battelle Memorial Institute, 505 King Avenue, Columbus, OH 43201-2693

J. Pressure Vessel Technol 120(4), 418-423 (Nov 01, 1998) (6 pages) doi:10.1115/1.2842353 History: Received March 28, 1997; Revised May 15, 1998; Online February 11, 2008

Abstract

In the spirit of GE/EPRI fracture mechanics procedure, estimation schemes for the crack driving force for circumferentially and axially surface-cracked pressurized elbows subjected to bending are developed. These schemes are based on the results of line-spring/shell model. The line-spring/shell model offers an attractive and inexpensive alternative to performing a large number of analyses of surface-cracked structures. This model has been shown to provide accurate predictions in comparison with the more involved three-dimensional model by Mohan (1998). Using the results of this model and following the GE/EPRI procedure, the coefficient functions, F1 and h1 , which provide the necessary information for predicting the crack driving force in cracked elbows, for several elbow and crack geometries are tabulated.

Copyright © 1998 by The American Society of Mechanical Engineers
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