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

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
권호 표지
DOI QR코드

DOI QR Code

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

원형 노치 CT 시편을 이용한 다양한 피로수명평가 절차의 보수성 평가

  • 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))
  • Received : 2019.10.16
  • Accepted : 2019.11.26
  • Published : 2019.12.30
Download PDF
⟨ Previous Next ⟩

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

References

  1. Bannantine, J. A., Corner, J. J. and Handrock, J. L., 1990, Fundamentals of Metal Fatigue Analysis, Prentice-Hall, Englewood Cliffs, New Jersey.
  2. ASME B&PV Code, Sec. III, Division 1 - Subsection NB, 2011, "Rules for Construction of Nuclear Facility Components," American Society of Mechanical Engineers, New York.
  3. ASME B&PV Code, Sec. VIII, Division 2, 2017, "Rules for Construction of Pressure Vessels," American Society of Mechanical Engineers, New York.
  4. Chopra, O. K. and Shack W. J., 2003, "Review of the Margins for ASME Code Fatigue Design Curve - Effects of Surface Roughness and Material Variability," U.S. Nuclear Regulatory Commission, Washington, DC, NUREG/CR-6815.
  5. ASME B&PV Code, Sec. III, Division 1 - Appendices, 2017, "Rules for Construction of Nuclear Facility Components," American Society of Mechanical Engineers, New York.
  6. ASTM E1820-15, 2015, "Standard Test Method for Measurement of Fracture Toughness," ASTM International, West Conshohocken, PA.
  7. Paul, S. K., Sivaprasad, S., Dhar, S. and Tarafder, S., 2011, "Key Issues in Cyclic Plastic Deformation: Experimentation," Mech. of Mater., Vol. 41, pp. 705-720. doi:https://doi.org/10.1016/j.mechmat.2011.07.011
  8. ASME B&PV Code, Sec. II, Part D, 2017, "Materials," American Society of Mechanical Engineers, New York.
  9. Hong, J. K., 2012, "Development and Application of the Battelle Structural Stress Method for Fatigue Evaluation of Welded Automotive Structures," J. Weld. Join., Vol. 30, No. 2, pp. 22-30. doi:https://doi.org/10.5781/KWJS.2012.30.2.126
  10. Kim, S. M., Kim, Y. N., Lee, S. H. and Kim, M. H., 2012, "Fatigue Assessment of Load-carrying Asymmetric Double Bevel Cruciform Welded Joints using Structural Stress Approach," J. Weld. Join., Vol. 30, No. 6, pp. 86-91. doi:https://doi.org/10.5781/KWJS.2012.30.6.572