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http://dx.doi.org/10.20466/KPVP.2019.15.2.019

Investigation into Conservatism of Various Fatigue Life Evaluation Procedures Using Round-Notched CT Specimens  

Kang, Ju-Yeon (서울과학기술대학교 기계시스템디자인공학과)
Chang, Dong-Joo (서울과학기술대학교 기계시스템디자인공학과)
Kim, Jun-Young (세종대학교 원자력공학과)
Kim, Sang-Eun (조선대학교 원자력공학과)
Lee, Jong-Min (고려대학교 기계공학과)
Huh, Nam-Su (서울과학기술대학교 기계시스템디자인공학과)
Kim, Jong-Sung (세종대학교 원자력공학과)
Kim, Jin-Weon (조선대학교 원자력공학과)
Kim, Yun-Jae (고려대학교 기계공학과)
Kim, Dae-Soo (한국전력기술(주))
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.15, no.2, 2019 , pp. 19-30 More about this Journal
Abstract
In this study, to evaluate conservatism of various fatigue life evaluation procedures, fatigue tests were conducted using compact tension (CT) specimens with a round notch, made of A516 Gr.70 carbon steel and A240 TP304 stainless steel, under load-controlled cyclic condition. Experimental fatigue failure cycles were measured and compared with predicted fatigue lives using two different life evaluation methods; (1) Design-By-Analysis (DBA) procedure given in ASME B&PV Code, Sec. III, Div. 1, Subsec. NB-3200 and (2) structural stress-based approach provided in ASME B&PV Code, Sec. VIII, Div. 2, Part 5. To predict fatigue failure cycles, three-dimensional elastic finite element analysis was conducted. Fatigue lives were predicted by both design fatigue curve given in ASME B&PV Code, Sec. III, Div. 1, Appendices and best-fit fatigue curve suggested in NUREG/CR-6815 for the DBA procedure. Finally, fatigue lives evaluated by various methods were compared with test results, and then conservatism between each evaluation procedure was discussed.
Keywords
Finite element analysis; Fatigue failure test; Fatigue life evaluation; Notch specimen; Structural stress;
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  • Reference
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