Fracture analysis of cracked elbows. Part 1: J-estimation schemes for internal circumferential and axial surface-cracks
- Battelle Memorial Inst., Columbus, OH (United States). Engineering Mechanics Dept.
In order to assure the structural integrity of nuclear piping system several approaches have been developed as part of the ASME Boiler and Pressure Vessel Code. All of these approaches are strictly applicable to flawed straight pipe sections. However, service failure do occur in pipe bend or elbow sections of the piping systems. Simple modifications or extensions of approaches applicable to flawed straight pipe sections appear quite inadequate for pressurized elbows containing flaws. Based on the spirit of GE/EPRI 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 large number of analyses of surface-cracked structures. This model has been shown to provide fairly accurate predictions in comparison with the more involved three-dimensional model by Mohan (1996). Using the results of this model and following the GE/EPRI procedure, the coefficient functions, F{sub 1} and h{sub 1}, which provide the necessary information for predicting the crack driving force in cracked elbows, for several elbow and crack geometries are tabulated.
- OSTI ID:
- 403211
- Report Number(s):
- CONF-960706-; ISBN 0-7918-1770-9; TRN: 97:000166
- Resource Relation:
- Conference: American Society of Mechanical Engineers (ASME) pressure vessels and piping conference, Montreal (Canada), 21-26 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of Fatigue and fracture -- 1996: Volume 1. PVP-Volume 323; Mehta, H.S. [ed.] [GE Nuclear Energy, San Jose, CA (United States)]; Bhandari, S. [ed.] [Framatome, Paris (France)]; Jones, D. [ed.] [Westinghouse Bettis, Pittsburgh, PA (United States)]; Rahman, S. [ed.] [Univ. of Iowa, Iowa City, IA (United States)]; Wilkowski, G. [ed.] [Battelle, Columbus, OH (United States)]; Yoon, K.K. [ed.] [Framatome Technologies, Lynchburg, VA (United States)]; PB: 412 p.
- Country of Publication:
- United States
- Language:
- English
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