Creep-fatigue endurance of a superheater tube plate under non-isothermal loading and multi-dwell condition

Nak-Kyun Cho, Run-Zi Wang, Zhiyuan Ma, Haofeng Chen, Fu-Zhen Xuan

Research output: Contribution to journalArticle

Abstract

Raising the operating temperature to increase electricity production in the nuclear power industry is a practical solution in the aspect of efficiency and emissions reduction. However, regarding structural integrity, such high temperature has a significant impact on the life of nuclear power plant components. The superheater tube plate is one of the most critical parts under exposures of very high temperature in the boiler system of the power plant. This study investigates creep-cyclic plasticity behaviour of a superheater outlet tube plate under extremely sophisticated thermo-mechanical loading and evaluates creep-fatigue damage endurance, using the modified LMM eDSCA. Temperature-dependent material properties are employed to calculate more practicable structural behaviour and lifetime prediction. The results clearly present the criticality of the effects of non-isothermal loading and multiple dwells on the structural integrity of the tube plate. Also, this study clarifies critical factors that cause dominant damage to the tube plate by providing total damages using various damage assessment models, of which results show the trend of the conservativeness of each damage assessment model, compared to experiment result.
LanguageEnglish
Article number105048
Number of pages30
JournalInternational Journal of Mechanical Science
Volume161-162
Early online date28 Jul 2019
DOIs
Publication statusE-pub ahead of print - 28 Jul 2019

Fingerprint

Superheater tubes
dwell
endurance
Creep
Durability
Fatigue of materials
damage assessment
tubes
Structural integrity
damage
integrity
Temperature
nuclear power plants
boilers
Fatigue damage
power plants
outlets
electricity
operating temperature
plastic properties

Keywords

  • superheater
  • non-isothermal
  • multi-dwell
  • creep-cyclic plasticity
  • creep-fatigue damage

Cite this

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title = "Creep-fatigue endurance of a superheater tube plate under non-isothermal loading and multi-dwell condition",
abstract = "Raising the operating temperature to increase electricity production in the nuclear power industry is a practical solution in the aspect of efficiency and emissions reduction. However, regarding structural integrity, such high temperature has a significant impact on the life of nuclear power plant components. The superheater tube plate is one of the most critical parts under exposures of very high temperature in the boiler system of the power plant. This study investigates creep-cyclic plasticity behaviour of a superheater outlet tube plate under extremely sophisticated thermo-mechanical loading and evaluates creep-fatigue damage endurance, using the modified LMM eDSCA. Temperature-dependent material properties are employed to calculate more practicable structural behaviour and lifetime prediction. The results clearly present the criticality of the effects of non-isothermal loading and multiple dwells on the structural integrity of the tube plate. Also, this study clarifies critical factors that cause dominant damage to the tube plate by providing total damages using various damage assessment models, of which results show the trend of the conservativeness of each damage assessment model, compared to experiment result.",
keywords = "superheater, non-isothermal, multi-dwell, creep-cyclic plasticity, creep-fatigue damage",
author = "Nak-Kyun Cho and Run-Zi Wang and Zhiyuan Ma and Haofeng Chen and Fu-Zhen Xuan",
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AU - Cho, Nak-Kyun

AU - Wang, Run-Zi

AU - Ma, Zhiyuan

AU - Chen, Haofeng

AU - Xuan, Fu-Zhen

PY - 2019/7/28

Y1 - 2019/7/28

N2 - Raising the operating temperature to increase electricity production in the nuclear power industry is a practical solution in the aspect of efficiency and emissions reduction. However, regarding structural integrity, such high temperature has a significant impact on the life of nuclear power plant components. The superheater tube plate is one of the most critical parts under exposures of very high temperature in the boiler system of the power plant. This study investigates creep-cyclic plasticity behaviour of a superheater outlet tube plate under extremely sophisticated thermo-mechanical loading and evaluates creep-fatigue damage endurance, using the modified LMM eDSCA. Temperature-dependent material properties are employed to calculate more practicable structural behaviour and lifetime prediction. The results clearly present the criticality of the effects of non-isothermal loading and multiple dwells on the structural integrity of the tube plate. Also, this study clarifies critical factors that cause dominant damage to the tube plate by providing total damages using various damage assessment models, of which results show the trend of the conservativeness of each damage assessment model, compared to experiment result.

AB - Raising the operating temperature to increase electricity production in the nuclear power industry is a practical solution in the aspect of efficiency and emissions reduction. However, regarding structural integrity, such high temperature has a significant impact on the life of nuclear power plant components. The superheater tube plate is one of the most critical parts under exposures of very high temperature in the boiler system of the power plant. This study investigates creep-cyclic plasticity behaviour of a superheater outlet tube plate under extremely sophisticated thermo-mechanical loading and evaluates creep-fatigue damage endurance, using the modified LMM eDSCA. Temperature-dependent material properties are employed to calculate more practicable structural behaviour and lifetime prediction. The results clearly present the criticality of the effects of non-isothermal loading and multiple dwells on the structural integrity of the tube plate. Also, this study clarifies critical factors that cause dominant damage to the tube plate by providing total damages using various damage assessment models, of which results show the trend of the conservativeness of each damage assessment model, compared to experiment result.

KW - superheater

KW - non-isothermal

KW - multi-dwell

KW - creep-cyclic plasticity

KW - creep-fatigue damage

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