Notch-related weakening and strengthening behavior under creep–fatigue conditions was studied in terms of the elastic–viscoplasticity finite-element method (FEM). A coupled damage analysis, i.e., the skeletal point method for creep damage evaluation coupled with the equivalent strain range method for fatigue damage, was employed in the notch effect evaluation. The results revealed that, under the short holding time condition, a weakening behavior was observed for the notch, while a strengthening effect was detected with the increase of holding time. The difference could be ascribed to the creep damage contribution in the holding stage. The influence of stress concentration factor (SCF), stress ratio, and the maximum stress was strongly dependent on the competition of creep and fatigue mechanism.
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February 2017
Research-Article
Notch Behavior of Components Under the Stress-Controlled Creep–Fatigue Condition: Weakening or Strengthening?
Jian-Guo Gong,
Jian-Guo Gong
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
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:
Fu-Zhen Xuan
Fu-Zhen Xuan
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
East China University of Science and
Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn
Search for other works by this author on:
Jian-Guo Gong
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
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: jggong@ecust.edu.cn
Fu-Zhen Xuan
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
East China University of Science and
Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 9, 2016; final manuscript received May 26, 2016; published online August 5, 2016. Assoc. Editor: Haofeng Chen.
J. Pressure Vessel Technol. Feb 2017, 139(1): 011407 (9 pages)
Published Online: August 5, 2016
Article history
Received:
April 9, 2016
Revised:
May 26, 2016
Citation
Gong, J., and Xuan, F. (August 5, 2016). "Notch Behavior of Components Under the Stress-Controlled Creep–Fatigue Condition: Weakening or Strengthening?." ASME. J. Pressure Vessel Technol. February 2017; 139(1): 011407. https://doi.org/10.1115/1.4033731
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