Failure under creep-fatigue interaction is receiving increasing interest due to an increased number of start-up and shut-down in fossil power generation plants as well as development of newer nuclear power plants employing low-pressure coolant. These situations have promoted the development of various approaches for evaluating its significance. However, most of them are fragment and rather limited in terms of materials and test conditions they covered. Therefore applicability of the proposed approaches to different materials or even different temperatures is uncertain in many cases. The present work was conducted in order to evaluate and compare the representative approaches used in the prediction of failure life under creep-fatigue conditions as well as their modifications, by systematically applying them to available test data on a wide range of materials which have been used or are planned to be used in various types of power generation plants. The following observations have been made from this exercise. (i) Time fraction model has a tendency to be unconservative in general, especially at low temperature and small strain range. Because of the large scatter of the total damage, this shortcoming would be difficult to cover by the consideration of creep-fatigue interaction in a fixed manner. (ii) Classical ductility exhaustion model showed a common tendency to be overly conservative in many situations, especially at small strain ranges. (iii) The modified ductility exhaustion model based on the re-definition of creep damage showed improved predictability with a slightly unconservative tendency. (iv) Energy-based ductility exhaustion model developed in this study seems to show the best predictability among the four procedures in an overall sense although some dependency on strain range and materials was observed.
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ASME 2009 Pressure Vessels and Piping Conference
July 26–30, 2009
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping
ISBN:
978-0-7918-4369-7
PROCEEDINGS PAPER
Systematic Evaluation of Creep-Fatigue Life Prediction Methods for Various Alloys
Yukio Takahashi,
Yukio Takahashi
Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa, Japan
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Bilal Dogan,
Bilal Dogan
Electric Power Research Institute, Charlotte, NC
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David Gandy
David Gandy
Electric Power Research Institute, Charlotte, NC
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Yukio Takahashi
Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa, Japan
Bilal Dogan
Electric Power Research Institute, Charlotte, NC
David Gandy
Electric Power Research Institute, Charlotte, NC
Paper No:
PVP2009-77990, pp. 1461-1470; 10 pages
Published Online:
July 9, 2010
Citation
Takahashi, Y, Dogan, B, & Gandy, D. "Systematic Evaluation of Creep-Fatigue Life Prediction Methods for Various Alloys." Proceedings of the ASME 2009 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Prague, Czech Republic. July 26–30, 2009. pp. 1461-1470. ASME. https://doi.org/10.1115/PVP2009-77990
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