Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Local Shape Optimization of Notches in Airframe for Fatigue-Life Extension

피로수명 연장을 위한 항공기 프레임 노치부위 국부형상 최적설계

  • 원준호 (한국항공대학교 항공우주 및 기계공학과) ;
  • 최주호 (한국항공대학교 항공우주 및 기계공학부) ;
  • 강진혁 (한국항공대학교 항공우주 및 기계공학과) ;
  • 안다운 (한국항공대학교 항공우주 및 기계공학과) ;
  • 윤기준 (한국항공대학교 항공우주 및 기계공학과)
  • Published : 2008.12.01
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Abstract

The aim of this study is to apply shape optimization technique for the repair of aging airframe components, which may extend fatigue life substantially. Free-form optimum shapes of a cracked part to be reworked or replaced are investigated with the objective to minimize the peak local stress concentration or fatigue-damage. Iterative non-gradient method, which is based on an analogy with biological growth, is employed by incorporating the robust optimization method to take account of the stochastic nature of the loading conditions. Numerical examples of optimal hole shape in a flat plate are presented to validate the proposed method. The method is then applied to determine the reworked or replacement shape for the repair of a cracked rib in the rear assembly wing body of aircraft.

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References

  1. Lincoln, J. W., 1997, Aging Aircraft-USAF Experience and Actions, Proc. The First Joint DoD/FAA/NASA Conf. on Aging Aircraft, Ogden, UT.
  2. McDonald, M. and Heller, M., 2004, “Robust Shape Optimization of Notches for Fatigue-Life Extension,” Struct and Multidisc Optim, Vol. 28, No. 1, pp. 55-68 https://doi.org/10.1007/s00158-004-0437-5
  3. Wu, Z., 2007, “On the Optimization Problem of Fillets and Holes in Plates with Curvature Constraints,” Struct and Multidisc Optim, Published Online
  4. Kristensen, E. S. and Madsen, N. F., 1976, “On the Optimum Shape of Fillets in Plates Subjected to Multiple in-Plane Loading Cases,” Int J Numer Methods Eng, Vol. 10, pp. 1007-1019 https://doi.org/10.1002/nme.1620100504
  5. Xie, Y. M. and Steven, G. P., 1992, “Optimal Design of Multiple Load Case Structures Using an Evolutionary Procedure,” Finite Element Analysis Research Centre, University of Sydney, Australia
  6. Herskovit, J., Dias, G. P. and MotaSoares, C. M., 1996, “A Full Stress Technique for Structural Optimization,” Appl Math Comp Sci J Shape Optim Sci Comp, Vol. 6, No. 2, pp. 303-319
  7. Fanni, M., Schnack, E. and Grunwald, J., 1994, “Shape Optimization of Dynamically Loaded Parts,” Int J Press Ves Pip, Vol. 59, pp. 281-297 https://doi.org/10.1016/0308-0161(94)90162-7
  8. Grunwald, J. and Schnack, E., 1997, “A Fatigue Model for Shape Optimization,” Struct and Multidisc Optim, Vol. 14, No. 1, pp. 36-44 https://doi.org/10.1007/BF01197556
  9. Chaperin, P., Jones, R., Heller, M., Pitt, S. and Rose, F., 2000, “A Methodology for Structural Optimization with Damage Tolerance Constraints,” Engineering Failure Analysis, Vol. 7, pp. 281-300 https://doi.org/10.1016/S1350-6307(99)00014-X
  10. Yu, Y. and Kwak, B. M., 2003, “Development of a CAD-Based General Purpose Optimal Design and Its Application to Structural Shape for Fatigue Life,” The 2003 Autumn Conference of KSME, pp. 1340-1345
  11. Park, J. K., Lee, C. J. and Lee, S. S., 2002, “Weight Reduction and Fatigue Life Estimation of Aircraft Structure Through Optimization Design,” The 2002 Association Symposium of KSME, pp. 42-47
  12. Mattheck, C. and Burkhardt, S., 1990, “A New Method of Structural Shape Optimisation Based on Biological Growth,” International Journal of Fatigue, Vol. 12, Issue 3, pp. 185-190 https://doi.org/10.1016/0142-1123(90)90094-U
  13. Norman, E. D., 1999, Mechanical Behavior of Materials, Pearson Prentice Hall, pp.443-454
  14. Haugen, E. B., 1980, Probabilistic Mechanical Design, Wiley, New York, Appendix 10-B
  15. Baker, A. A., Rose, L. R. F. and Jones, R., 2002, Advances in the Bonded Composite Repair of Metallic Aircraft Structure, Elsevier, Boston