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Metals 2019, 9(2), 183; https://doi.org/10.3390/met9020183

A New Empirical Life Prediction Model for 9–12%Cr Steels under Low Cycle Fatigue and Creep Fatigue Interaction Loadings

1
School of Mechanical and Power Engineering, Nanjing Tech University, No.30 Puzhu South Road, Nanjing 211800, China
2
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, No.30 Puzhu South Road, Nanjing 211800, China
3
Faculty of Engineering and Architecture, Ghent University, 9000 Ghent, Belgium
4
Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam
5
Soete Laboratory, Ghent University, Technologiepark Zwijnaarde 903, B-9052 Zwijnaarde, Belgium
*
Authors to whom correspondence should be addressed.
Received: 27 December 2018 / Revised: 24 January 2019 / Accepted: 31 January 2019 / Published: 3 February 2019
(This article belongs to the Special Issue Fatigue Design and Defects in Metals and Alloys)
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Abstract

Low cycle fatigue (LCF) and creep fatigue interaction (CFI) loadings are the main factors resulting in the failure of many critical components in the infrastructure of power plants and aeronautics. Accurate prediction of life spans under specified loading conditions is significant for the design and maintenance of components. In the present study, various LCF and CFI tests are conducted to investigate the effects of temperature, strain amplitude, hold time and hold direction on the fatigue life of P92 steel. To predict fatigue life under different experimental conditions, various conventional life prediction models are evaluated and discussed. Moreover, a new empirical life prediction model is proposed based on the conventional Manson-Coffin-Basquin (MCB) model. The newly proposed model is able to simultaneously consider the effects of temperature, strain amplitude, hold time and hold direction on predicted life. The main advantage is that only the known input experimental parameters are required to perform the prediction. In addition to the validation made through the experimental data of P92 steel conducted in the present paper, the model is also verified through numerous experimental data reported in the literature for various 9–12% Cr steels. View Full-Text
Keywords: low cycle fatigue; creep fatigue interaction; life prediction; Manson-Coffin-Basquin low cycle fatigue; creep fatigue interaction; life prediction; Manson-Coffin-Basquin
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, X.; Zhang, W.; Zhang, T.; Gong, J.; Abdel Wahab, M. A New Empirical Life Prediction Model for 9–12%Cr Steels under Low Cycle Fatigue and Creep Fatigue Interaction Loadings. Metals 2019, 9, 183.

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