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랜덤하중에서의 균열전파속도 추정법에 관한 연구
A Prediction of Crack Propagation Rate under Random Loading

표동근    (홍익대학교, 공과대학   ); 안태환    (충주산업대학교  );
  • 초록

    Under variable amplitude loading conditions, retardation or accelerated condition of fatigue crack growth occurs with every cycle, Because fatigue crack growth behavior varied depend on load time history. The modeling of stress amplitude with storm loading acted to ships and offshore structures applied this paper. The crack closure behavior examine by recording the variation in load-strain relationship. By taking process mentioned above, fatigue crack growth rate, crack length, stress intensity factor, and crack closure stress intensity factor were obtained from the stress cycles of each type of storm ; A(6m), B(7m), C(8m), D(9m), E(11m) and F(15m) which was wave height. It showed that the good agreement with between the experiment results and simulation of storm loads. So this estimated method of crack propagtion rate gives a good criterion for the safe design of vessels and marine structure.


  • 주제어

    랜덤하중 .   파도하중 .   균열전파속도 .   유효응력확대계수 .   균열닫힘 .   Random Loading .   Storm Loading .   Crack propagation Rate .   Effective Stress Intensity Factor .   Crack Closure.  

  • 참고문헌 (10)

    1. A Critical Analysis of Crack Propagation Laws , P.Paris;F.Erdogan , Transactions of the ASME / v.,pp.528-534,
    2. Yielding of Steels Containing Slits , D.S.Dugdale , J. Mech. Phys. Solids / v.8,pp.100-104,
    3. p分布 블럭荷重에 依한 人工海水中의 腐蝕疲勞强度特性에 關한 硏究 , 表東根;高柱石 , 韓國海洋工學會誌 / v.3,pp.415-425,
    4. The Society of Material Science , Stress Intensity Factors Handbook / v.1,pp.297,
    5. Statistical Characteristics of Wave-Induced Load and Simulation Method of Wave Loading Pattern for Fatigue design , Yasumitsu Tomita;H.K.;T.F. , ISOPE / v.4,pp.216-221,
    6. Crack Propagation in Thin Metal Sheet under Repeated Loading , H.W.Liu , Journal of Basic Engineering / v.,pp.23-30,
    7. Design Aspects of High-Temperature Fatigue With Particular Reference to Thermal Stress , L.F.Coffin,J.R.;Schenectady,N.Y. , Transactions of the ASME / v.,pp.527-532,
    8. Studies on the Fatigue Crack Growth under Random Loading(2nd Report) , Yasumitsu Tomita;Kiyoshi Hashimoto;Hajime Sakata , J. of Soc. of the Nav. Arch. of Japan / v.163,pp.381-389,
    9. Cumulative Fatigue Damage under Random Loads , H.Okamura;S.Sakai;I.Susuki , Fatigue of Engineering Materials and Structures / v.1,pp.409-419,
    10. A Study of Cumulative Damage in Fatigue by Block Loading with P-Distribution , Iida,K.;Kaneko,A. , J. of Soc. of the Nav. Arch. of Japan / v.144,pp.381-389,

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