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Technical Briefs

Assessment of Low Cycle Fatigue Life of Steam Turbine Rotor Based on a Thermodynamic Approach

[+] Author and Article Information
Yong-Jian Sun

Department of Automation, Shanghai Jiao Tong University,  Key Laboratory of System Control and Information Processing, Ministry of Education of China, 200240, Shanghai, Chinasunyongjian2006@163.com

Li-Sheng Hu1

Department of Automation, Shanghai Jiao Tong University,  Key Laboratory of System Control and Information Processing, Ministry of Education of China, 200240, Shanghai, Chinalshu@sjtu.edu.cn

1

Corresponding author.

J. Eng. Gas Turbines Power 134(6), 064504 (Apr 12, 2012) (4 pages) doi:10.1115/1.4006004 History: Received November 01, 2011; Revised November 18, 2011; Published April 10, 2012; Online April 12, 2012

A new nonlinear model is proposed to assess the low cycle fatigue life of a 300 MW steam turbine rotor. Manson-Coffin equation and cyclic stress-strain relationship are employed to eliminate the unmeasured parameters, so all the parameters in model are measurable. Through comparison with that from the linear accumulation theory and continuum damage mechanics theory the results show this new nonlinear model describes the damage accumulation well and precisely in accordance with the practical test data. This approach supplies a new way to assess the damage of steam turbine rotor with satisfactory precision in engineering.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

The contrast between the FEA curve and the fitting curve under the cold start

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Figure 2

Damage evolution for low cycle fatigue life

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Figure 3

Contrast between present work and the CDM model

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