A Study on the Fatigue Crack Propagation Analysis Using Equivalent Stress Distribution

등가분포응력을 이용한 피로균열전파해석에 관한 연구

  • 김창욱 (한국선급 선체기술부 화물선팀) ;
  • 노인식 (충남대학교 선박해양공학과) ;
  • 도관수 (한국선급선체기술부 탱커팀)
  • Published : 2002.05.01


From the viewpoint of linear fracture mechanics, the crack propagation behavior of two different structures having the same K-a relationship could be considered identical. In this study the stress distribution in an infinitely wide cracked plate with the same K-a relationship as in a real structure is defined as the equivalent stress distribution. Fatigue life of a real structural element can be predicted by applying the equivalent stress distribution to a simple structural element, and performing a fatigue crack propagation analysis. The K-a relationship for a structural member can be estimated by a finite element method or a simplified prediction method. The validity to obtain effective crack driving stresses by using the equivalent stress-distribution is examined.


fatigue;fracture mechanics;equivalent stress distribution;effective crack driving stress


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