한국압력기기공학회 논문집 (Transactions of the Korean Society of Pressure Vessels and Piping)

한국압력기기공학회 (Korean Society of Pressure Vessels and Piping)
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원형 노치 CT 시편을 이용한 다양한 피로수명평가 절차의 보수성 평가

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

  • 강주연 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 장동주 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김준영 (세종대학교 원자력공학과) ;
  • 김상언 (조선대학교 원자력공학과) ;
  • 이종민 (고려대학교 기계공학과) ;
  • 허남수 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김종성 (세종대학교 원자력공학과) ;
  • 김진원 (조선대학교 원자력공학과) ;
  • 김윤재 (고려대학교 기계공학과) ;
  • 김대수 (한국전력기술(주))
  • 투고 : 2019.10.16
  • 심사 : 2019.11.26
  • 발행 : 2019.12.30
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초록

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.

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참고문헌

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