Pipe and elbow ratcheting strain effects on predicted fatigue failure
- GE Nuclear Energy, San Jose, CA (United States)
Pipe and elbow ratcheting strains and their effects on fatigue failures have been investigated in the Piping and Fitting Dynamic Reliability Research Program (PRDRRP). This program was sponsored by EPRI and NRC and was performed by General Electric from 1985 to 1988. Forty-one piping components have been tested, which consisted of elbows, tees, reducers, nozzles and supports. In addition, two piping systems were tested for seismic loads and two other systems were tested for seismic loads and two other systems were tested for water hammer loads. In the test program seismic time history inputs, typical of those expected to occur at nuclear plants were scaled up to 50 times in amplitude to investigate the dynamic behavior and the failure modes of the piping components and piping systems. Most of the systems were pressurized at room temperature and were tested to failure. High strain rossettes were installed at high stress locations to measure the cyclic strains and ratcheting strains. In addition, scratch marks were made on the high stress locations. The elongation of the scratch marks were recorded to evaluate the ratcheting strains for each of the seismic test runs. This paper presents the ratcheting strain data. The measured ratcheting strains were compared to the ratcheting strains prediction using the approach by both the Miller Model and Edmunds-Bear Model. The fatigue failure data were compared with fatigue analyses.
- OSTI ID:
- 170335
- Report Number(s):
- CONF-950740-; ISBN 0-7918-1343-6; TRN: 96:006296
- Resource Relation:
- Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Seismic engineering 1995. PVP-Volume 312; Ma, D.C. [ed.] [Argonne National Lab., IL (United States)]; Suzuki, K. [ed.] [Tokyo Metropolitan Univ., Hachioji, Tokyo (Japan)]; Aggrawal, M.L. [ed.] [and others]; PB: 470 p.
- Country of Publication:
- United States
- Language:
- English
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