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비행하중하에서 2124-T851 알루미늄합금의 피로균열진전 예측
Prediction of Crack Growth in 2124-7851 Al-Alloy Under Flight-Simulation Loading

심동석   (한양대학교 산업과학연구소UU0001519  ); 황돈영   (대한항공 한공기술연구원CC0125343  ); 김정규   (한양대학교 기계공학부UU0001519  );
  • 초록

    In this study, to propose the prediction method of the crack growth under flight-simulation loading, crack growth tests are conducted on 2124-7851 aluminum alloy specimens. The prediction of crack growth under flight-simulation loading is performed by the stochastic crack growth model which was developed in previous study. First of all, to reduce the complex load history into a number of constant amplitude events, rainflow counting is applied to the flight-simulation loading wave. The crack growth, then, is predicted by the stochastic crack growth model that can describe the load interaction effect as well as the variability in crack growth process. The material constants required in this model are obtained from crack growth tests under constant amplitude loading and single tensile overload. The curves predicted by the proposed model well describe the crack growth behavior under flight-simulation loading and agree with experimental data. In addition, this model well predicts the variability of fatigue lives.


  • 주제어

    피로균열진전 .   비행하중 .   변동성 .   돌발하중 .   하중간섭효과 .   균열진전지연 .   지연계수.  

  • 참고문헌 (15)

    1. Kim, J. K. and Shim, D. S., 1998, 'A Stochastic Analysis on Variation of Fatigue Crack Propagation due to Thickness Effect,' Transaction of KSME(A), Vol. 22, No.8, pp. 1523-1532 
    2. Shim, D. S. and Kim, J. K., 1999, 'A Stochastic Analysis for Crack Growth Retardation Behavior and Prediction of Retardation Cycle Under Single Overload,' Transaction of KSME(A), Vol. 23, No.7, pp. 1164-1172 
    3. Dominguez, J., Zapatero, J. and Pascual, J., 1997, 'Effect of Load Histories on Scatter of Fatigue Crack Growth in Aluminum Alloy 2024- T351 ,' Engineering Fracture Mechanics, Vol. 56 No. 1, pp. 65-76 
    4. Standard Test Method for Measurement of Fatigue Crack Growth Rates,' ASTM E647-95 
    5. 'Standard Practices for Cycle Counting In Fatigue Analysis,' ASTM E1049-85 
    6. Ralph I. Stephens, Ali Fatemi, Robert R. Stephens, and Henry O. Fuchs, 2001, Metal Fatigue in Engineering, Willey-Interscience, 2nd edition, pp. 155-157 
    7. Kim, C. Y. and Song, J. H., 1994, 'Fatigue Crack Closure and Growth Behavior under Random Loading,' Engineering Fracture Mechanics, Vol. 49, No. I, pp. 105-120 
    8. Newman, Jr., J. C., 1981, 'A Crack-Closure Model for Predicting Fatigue Crack Growth under Aircraft Spectrum Loading,' ASTM STP 748, pp. 54-84 
    9. Kang, J. Y., Song, J. H. and Kim, C. Y., 2000, 'Automatic Determination of Crack Opening Loading under Random Loading by the Use of Neural Network,' Transaction of KSME(A), Vol. 24, No.9, pp. 2283-2291 
    10. Johnson, W. S., 1981, 'Multi-Parameter Yield Zone Model for Predicting Spectrum Crack Growth,' ASTM STP 748, pp. 85-102 
    11. Shim, D. S., Kim, K. B. and Kim, J. K., 2000, 'Fatigue Life Prediction for High Strength Al-alloy under Variable Amplitude Loading,' Transaction of KSME(A), Vol. 24, No.8, pp. 2074-2082 
    12. Elber, W., 1976, 'Equivalent Conatant-Amplitude Concept for Crack Growth under Spectrum Loading,' ASTM STP 595, pp. 236-250 
    13. Hudson, C. M., 1981,'A Root-Mean-Square Approach for Predicting Fatigue Crack Growth under Random Loading,' ASTM STP 748, pp. 4152 
    14. Elber, W., 1971, 'The Significance of Fatigue Crack Closure,' ASTM STP 486, pp. 230-242 
    15. Schijve, Jaap, 1980, 'Prediction Methods for Fatigue Crack Growth in Aircraft Material,' ASTM STP 700, pp. 3 - 34 
  • 이 논문을 인용한 문헌 (4)

    1. 2003. "Effect of Stringers in Stiffened Panel under Varying Fatigue Load" 한국정밀공학회지 = Journal of the Korean Society of Precision Engineering, 20(2): 136~145     
    2. Lee, Ouk-Sub ; Kim, Seung-Gwon 2007. "Prediction and Application of Fatigue Life on Characteristics of Fatigue Crack Propagation of Thin Sheet Alloy" 한국정밀공학회지 = Journal of the Korean Society of Precision Engineering, 24(2): 103~109     
    3. Kang, Ki-Weon ; Koh, Seung-Ki ; Choi, Dong-Soo ; Kim, Tae-Sung 2010. "Fatigue Life and Stress Spectrum of Wing Structure of Aircraft" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 34(9): 1185~1191     
    4. Kim, Seung-Gwon ; Lee, Ouk-Sub 2011. "A Quantitative Analysis of ΔK Conversion Method for the Retardation Behavior of Fatigue Crack Growth in Varying Thickness of Al 2024-T3 Sheet Alloy" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 35(11): 1415~1422     

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