Journal article
Low-cycle fatigue crack growth considerations in pipe fracture analyses
Nuclear engineering and design, Vol.168(1-3), pp.105-118
05/1997
DOI: 10.1016/S0029-5493(96)00007-6
Abstract
This paper presents some results from an ORNL cyclic pipe experiment that demonstrated the magnitude of low-cycle fatigue crack growth from simulated seismic loading. The concern with this result is that current pipe flaw evaluation procedures do not consider the cyclic crack growth during a seismic event, i.e. the peak dynamic load is used in a static analysis. This was the main incentive for the analyses developed in this paper. Additional applications of the methodology developed in this paper would be high stress-low cycle fatigue transients that can occur in service. In this paper, we show that the low-cycle fatigue crack growth data from the ORNL pipe test agreed well with the extrapolation of high-cycle fatigue crack growth data from small specimens. The next step was to evaluate the accuracy of several different methods to predict the low-cycle fatigue crack growth. In this evaluation it was found that for low-cycle fatigue LEFM analysis would significantly underpredict the crack growth and EPFM analyses were needed. Three different EPFM analyses were used. The GE/EPRI method was found to be overly conservative, which is consistent with comparisons with past pipe fracture data. The LBB.NRC and LBB.ENG2 J-estimation schemes provided good predictions of the experimental crack growth data when the crack-closure load was taken into account.
Details
- Title: Subtitle
- Low-cycle fatigue crack growth considerations in pipe fracture analyses
- Creators
- S Rahman - Department of Mechanical Engineering, The University of Iowa, Iowa City, IA 52 242, USAG Wilkowski - Engineering Mechanics Group, Battelle Memorial Institute, Columbus, OH 43 201, USAR Mohan - Engineering Mechanics Group, Battelle Memorial Institute, Columbus, OH 43 201, USA
- Resource Type
- Journal article
- Publication Details
- Nuclear engineering and design, Vol.168(1-3), pp.105-118
- Publisher
- Elsevier B.V
- DOI
- 10.1016/S0029-5493(96)00007-6
- ISSN
- 0029-5493
- eISSN
- 1872-759X
- Language
- English
- Date published
- 05/1997
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984064586502771
Metrics
10 Record Views