Structural discontinuities (e.g., nozzle, hole, and groove) widely occur in many high temperature components of nuclear and fossil power plants. In general, the notched component is used for simplified tests and analyses due to the complexity of the introduction of a practical component. In the previous work, the effects of the notch on failure life of the components have been reported experimentally, including the strengthening and weakening effects; however, the internal mechanisms have not been clearly demonstrated. This work reviews the notch effects on the structural strength of the notched components at elevated temperatures under creep, fatigue, and creep-fatigue loading conditions. Experimental phenomena (i.e., strengthening or weakening effects) for typical notched specimens subjected to the above three loading conditions are summarized, and the related factors for notch effects on creep rupture life or cycle to failure of the components are discussed. The mechanisms for the strengthening or weakening effects induced by a notch are described. Evaluation procedures for notch effect analysis under complex loading conditions are also included, and the primary challenges concerning the notch effect are provided for further investigations.
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October 2019
Review Articles
Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism
Jian-Guo Gong,
Jian-Guo Gong
Key Laboratory of Pressure Systems and
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: jggong@ecust.edu.cn
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: jggong@ecust.edu.cn
Search for other works by this author on:
Cheng Gong,
Cheng Gong
Key Laboratory of Pressure Systems and
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
Shanghai 200237, China
e-mail: y10160068@mail.ecust.edu.cn
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road
,Shanghai 200237, China
e-mail: y10160068@mail.ecust.edu.cn
Search for other works by this author on:
Fu-Zhen Xuan,
Fu-Zhen Xuan
Key Laboratory of Pressure Systems
and Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn
and Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road
,Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn
1Correspondence author.
Search for other works by this author on:
Haofeng Chen
Haofeng Chen
Department of Mechanical and
Aerospace Engineering,
University of Strathclyde,
Glasgow G1 1XJ, UK
e-mail: haofeng.chen@strath.ac.uk
Aerospace Engineering,
University of Strathclyde,
Glasgow G1 1XJ, UK
e-mail: haofeng.chen@strath.ac.uk
Search for other works by this author on:
Jian-Guo Gong
Key Laboratory of Pressure Systems and
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: jggong@ecust.edu.cn
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: jggong@ecust.edu.cn
Cheng Gong
Key Laboratory of Pressure Systems and
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
Shanghai 200237, China
e-mail: y10160068@mail.ecust.edu.cn
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road
,Shanghai 200237, China
e-mail: y10160068@mail.ecust.edu.cn
Fu-Zhen Xuan
Key Laboratory of Pressure Systems
and Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn
and Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road
,Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn
Haofeng Chen
Department of Mechanical and
Aerospace Engineering,
University of Strathclyde,
Glasgow G1 1XJ, UK
e-mail: haofeng.chen@strath.ac.uk
Aerospace Engineering,
University of Strathclyde,
Glasgow G1 1XJ, UK
e-mail: haofeng.chen@strath.ac.uk
1Correspondence author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 18, 2018; final manuscript received May 18, 2019; published online July 17, 2019. Assoc. Editor: Steve J. Hensel.
J. Pressure Vessel Technol. Oct 2019, 141(5): 050801 (14 pages)
Published Online: July 17, 2019
Article history
Received:
November 18, 2018
Revised:
May 18, 2019
Citation
Gong, J., Gong, C., Xuan, F., and Chen, H. (July 17, 2019). "Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism." ASME. J. Pressure Vessel Technol. October 2019; 141(5): 050801. https://doi.org/10.1115/1.4043843
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