• Title/Summary/Keyword: 피로균열정지설계

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

  • Rhee, Eui-Jong;Rhee, Hwan-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.2
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    • pp.50-56
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    • 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.

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

  • Rhee, Eui-Jong;Rhee, Hwan-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.2
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    • pp.43-49
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    • 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.

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

  • Moon-Sik Han
    • Journal of the Society of Naval Architects of Korea
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    • v.30 no.4
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    • pp.102-111
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    • 1993
  • One of the most important design procedures for large sized structures is the evaluation of fracture strength against fatigue and brittle fractures threatening to occur in their steel members. In this paper, the safety assessment based upon the knowledge about the fracturing characteristics of such ship structures was discussed, which can be estimated from such phenomena as fatigue crack propagation and brittle fractures, as obtained by employing fracture mechanics at the basic design stage. Model tests with a partial structure specimen of full size was carried out to authenticate a question as to whether or not the fracturing characteristics of such sophisticated structures could be estimated with precision from ordinary scale specimen tests, It was shown that the behviour of fatigue crack growth of large sized structures in this study could be predicted from the results of ordinary scale specimen test.

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

  • Rhee, Eui-Jong;Rhee, Hwan-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.5 no.2
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    • pp.42-48
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    • 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.

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