DOI QR코드

DOI QR Code

과대하중이 피로수명에 미치는 영향에 관한 연구

A Study on the Effect of Overloading on Fatigue Life

  • 발행 : 2003.06.01

초록

Ships and ocean structures are subjected to random loads caused by irregular waves. The irregularity of amplitude from random loading affects on fatigue crack growth and fatigue life. However the effects of irregularity of loading on fatigue including random loading have not been explained exactly. Therefore in this paper crack growth tests on DENT specimens under constant-amplitude loading including a single tensile overload are conducted to investigate the effect of overload on crack growth rate. The size of plastic zone and crack growth rate before and after a single tensile overloading are measured using ESPI system. Crack growth retardation model that is characterized by crack growth length and the size of plastic zone was proposed and compared with test result. From the research, the validity of proposed model is examined on crack growth retardation, and consequently fatigue life.

키워드

참고문헌

  1. 김경수, 심천식, 2002, “전자스패클패턴 간섭시스템을 이용한 피로하중을 받는 균열선단에서 탄소성 영역 측정에 관한 연구,” 한국해양공학회지, 제 16권, 제 4호, pp. 3-18.
  2. 김경수, 심천식, 2002, “3D-ESPI 시스템을 이용하여 결정된 응력집중계수가 피로수명에 미치는 영향에 관한 연구,” 한국해양공학회지, 제 16권, 제 1호, pp. 46-51.
  3. 김경수, 신병천, 심천식, 박진영, 조형민, 2002, “과대하중이 피로수명에 미치는 영향에 관한 연구,” 대한조선학회 추계학술대회 논문집, pp. 345-348.
  4. 김창욱, 노인식, 도관수, 신병천, 2001, “균열개폐구 거동을 고려한 피로균열전파 해석 모델의 개발: 수치계산,” 대한조선학회논문집, 제 38권 제 3호, pp. 84-92.
  5. ASTM E647-99 1999, "Standard Test Method for Measurement of Fatigue Crack Growth RAtes," In: Annual Book of ASTM Standards, Am. Soc. for Testing and Materials, Philadelphia, pp. 591-630.
  6. Anderson T. L., 1995, "Fracture Mechanics-Fundamentals and Applications," CRC Press
  7. Dowling N. E., 1993, "Mechanical Behavior of Materials," Prentice Hall
  8. Elber W., 1971, "The significance of crack closure," ASTM STP 486, pp. 230-242.
  9. Toyosada M., Niwa T. and Sakai. J.. 1997, "Physical meaning of ${\Delta}K_{RP}$ and fatigue crack propagation in the residual stress distribution field," Int. J. Fatigue Vol. 19, No. 1, pp. 161-166.
  10. Wheeler O. E., 1972, "Spectrum loading and crack growth," J. Bas, Engng, Trans ASME 94, pp. 181-186.
  11. Willenborg J., Engle R. and Wood H. A. 1971 "A crack retardation model using an effective stress concept," Technical Memorandum 71-1FBR, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Ohio

피인용 문헌

  1. An Experimental Study on Fatigue Life Evaluation of Welded Joints under Storm Loading vol.49, pp.1, 2012, https://doi.org/10.3744/SNAK.2012.49.1.99