The aim of this study was to investigate the cyclic creep–fatigue interaction behavior in a steam turbine inlet valve under cyclic thermomechanical loading conditions. Three years and nine iterations of idealized startup–steady-state operation–shutdown process were chosen. The Ramberg–Osgood model, the Norton–Bailey law, and continuum damage mechanics were applied to describe the stress–strain behavior and calculate the damage. The strength of the steam valve revealed that significant stress variation mainly occurred at the joint parts between the valve diffuser and the adjust valve body, due to the combination of the enhanced turbulent flow and assembly force at these areas. The contact stress at the region of component assembly was sensitive to the cyclic loading at the initial iterations. The maximum decrease amplitude in the normalized contact stress between the second and the fourth iterations reached 0.12. The damage analysis disclosed that the notch of the deflector in the adjust valve had the maximum damage due to the stress concentration.
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November 2017
Research-Article
Numerical Investigation of Creep–Fatigue Behavior in a Steam Turbine Inlet Valve Under Cyclic Thermomechanical Loading
Weizhe Wang,
Weizhe Wang
Key Lab of Education Ministry
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: wangwz0214@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: wangwz0214@sjtu.edu.cn
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Sihua Xu,
Sihua Xu
Shanghai Electric Power Generation
Equipment Co., Ltd.,
Shanghai 200240, China
e-mail: xush@shanghai-electric.com
Equipment Co., Ltd.,
Shanghai 200240, China
e-mail: xush@shanghai-electric.com
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Yingzheng Liu
Yingzheng Liu
Key Lab of Education Ministry
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yzliu@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yzliu@sjtu.edu.cn
Search for other works by this author on:
Weizhe Wang
Key Lab of Education Ministry
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: wangwz0214@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: wangwz0214@sjtu.edu.cn
Sihua Xu
Shanghai Electric Power Generation
Equipment Co., Ltd.,
Shanghai 200240, China
e-mail: xush@shanghai-electric.com
Equipment Co., Ltd.,
Shanghai 200240, China
e-mail: xush@shanghai-electric.com
Yingzheng Liu
Key Lab of Education Ministry
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
for Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yzliu@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yzliu@sjtu.edu.cn
1Corresponding author.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 29, 2016; final manuscript received May 1, 2017; published online June 21, 2017. Assoc. Editor: David Sanchez.
J. Eng. Gas Turbines Power. Nov 2017, 139(11): 112502 (15 pages)
Published Online: June 21, 2017
Article history
Received:
November 29, 2016
Revised:
May 1, 2017
Citation
Wang, W., Xu, S., and Liu, Y. (June 21, 2017). "Numerical Investigation of Creep–Fatigue Behavior in a Steam Turbine Inlet Valve Under Cyclic Thermomechanical Loading." ASME. J. Eng. Gas Turbines Power. November 2017; 139(11): 112502. https://doi.org/10.1115/1.4036953
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