• 제목/요약/키워드: 피로균열정지설계

검색결과 4건 처리시간 0.025초

보강판의 균열거동해석과 Crack Arrest 설계(II) - Crack Arrest 거동의 시뮬레이션 (Crack Growth Analysis and Crack Arrest Design of Stiffened Panels(II) - Numerical Simulation of Crack Arrest Behavior)

  • 이의종;이환우
    • 한국기계가공학회지
    • /
    • 제4권2호
    • /
    • pp.50-56
    • /
    • 2005
  • To demonstrate the feasibility of utilizing FCAD chart proposed in our previous work, series of crack growth/arrest behavior in the integrally stiffened panels were simulated by numerical method using upper mentioned FCAD charts and a new crack growth rate equation. It is concluded that proposed family of FCAD curves, in the form of non-dimensional arrest load ranges, are reliable indicators of fatigue crack growth/arrest behavior of integrally stiffened panels considered here.

  • PDF

보강판의 균열거동해석과 Crack Arrest 설계(I) - Crack Arrest 설계기준의 수치해석 (Crack Growth Analysis and Crack Arrest Design of Stiffened Panels(I) - Numerical Approaches to Crack Arrest Design Chart)

  • 이의종;이환우
    • 한국기계가공학회지
    • /
    • 제4권2호
    • /
    • pp.43-49
    • /
    • 2005
  • The purpose of a fatigue crack arrest design is to prevent a fatigue fracture of machine and structure resulted from unstable crack growth. In all cases of load transfer to second elements such as stringers, doublers or flanges, crack arrest is possible; arrest occurring when the fatigue crack reaches the second element. In the present work, a numerical analysis was carried out to estimate the effect of shape parameters on fatigue crack growth and arrest behavior of integrally stiffened panels. Based on these results, a set of fatigue crack arrest design chart is presented as "non-dimensional arrest load - thickness ratio" relationship.

  • PDF

대형구조물의 파괴강도 특성 평가기술에 관한 연구 (A Study on The Evaluation of Fracture Strength for Large Sized Structures Based upon Their Fracturing Characteristics)

  • 한문식
    • 대한조선학회논문집
    • /
    • 제30권4호
    • /
    • pp.102-111
    • /
    • 1993
  • 대형구조물에서 발생되는 피로 및 취성파괴에 대한 강도의 특성 평가는 대형구조물의 설계에서 중요한 검토 사항중에 하나이다. 본 논문에서는 대형선체 및 해양구조물과 같은 대형구조물의 기본 설계단계에서 파괴역학을 이용하여 피로균열 진전과 취성파괴 발생 및 정지등에 대한 구조물의 파괴 강도 특성을 파악하고 이것을 기초로 이에 대한 안전성평가를 검토하였다. 소형시험 결과에서 선체구조의 상갑판 전단부와 같은 복잡한 구조물의 피로파괴 강도특성을 정도가 높고 또한 간편하게 추정할 수 있는가에 대하여, 실물크기 부분구조 모델시험을 실시하여 이를 비교 검토하였다. 본 연구대상에서는 소형시험결과를 기초로해서 대형구조물의 피로균열전파거동을 예측할 수 있음을 보였다.

  • PDF

보강판의 균열거동해석과 Crack Arrest 설계(III) - Crack Arrest Design 차트의 실험평가 (Crack Growth Analysis and Crack Arrest Design of Stiffened Panels(III) - Experimental Evaluation of Crack Arrest Design Chart)

  • 이의종;이환우
    • 한국기계가공학회지
    • /
    • 제5권2호
    • /
    • pp.42-48
    • /
    • 2006
  • In order to assess the validity of fatigue crack arrest design charts obtained from our previous numerical approach to fatigue crack arrest condition, an extensive fatigue crack growth/arrest test was performed using CT-type integrally stiffened panels. The results are presented as fatigue crack growth rate and non-dimensional crack length relationship, and these are compared with numerically simulated crack growth rates. The measured values of da/dN at the moment of fatigue crack arrest occurred in stiffened panels are good agreement with those numerically simulated crack growth rates.

  • PDF