Fatigue analysis using simplified elastic-plastic analysis
Book
·
OSTI ID:191353
- Becht Engineering Co., Inc., Liberty Corner, NJ (United States)
During the design and fatigue analysis of a high-cycle jacketed reactor, high local stresses were found that governed the fatigue life. Because the primary plus secondary stress intensity range exceeded 3S{sub m}, fatigue analysis procedures of the ASME Boiler and Pressure Vessel Code, Section VIII, Div 2, Appendix 4 would require a K{sub e} factor be applied to the calculated stress amplitude. The K{sub e} factor provides a very conservative bounding estimate of strain concentration. Using this procedure indicated that the design had an unacceptably low fatigue life. The authors then estimated the plastic strain concentration using several elastic finite element analyses in which the elastic modulus of the local, highly stressed section was reduced to simulate elastic-plastic behavior. This method, termed GLOSS or elastic compensation, revealed that the actual strain concentration was much lower than predicted by the K{sub e} factor and that the fatigue life of the component was actually better than required.
- OSTI ID:
- 191353
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1337-1
- Country of Publication:
- United States
- Language:
- English
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