Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지

Characterization of Fracture Behavior in Repaired Skin/Stiffener Structure with an Inclined Central Crack

  • Chung, Ki-Hyun (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Yang, Won-Ho (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Heo, Sung-Pil (Department of Mechanical Engineering, Sungkyunkwan University)
  • Published : 2002.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

Finite element analysis for the stress intensity factor (SIF) at the skin/stiffener structure with inclined central crack repaired by composite stiffened panels is developed. A numerical investigation was conducted to characterize the fracture behavior and crack growth behavior at the inclined crack. In order to investigate the crack growth direction, maximum tangential stress (MTS) criterion are used. Also, this paper is to study the performance of the effective bonded composite patch repair of a plate containing an inclined central through-crack. The main objective of this research is the validation of the inclined crack patching design. In this paper, the reduction of stress intensity factors at the crack-tip and prediction of crack growth direction are determined to evaluate the effects of various non-dimensional design parameter including; composite patch thickness and stiffener distance. We report the results of finite element analysis on the stiffener locations and crack slant angles and discuss them in this paper. The research on cracked structure subjected to mixed mode loading is accomplished and concludes that more work using a different approaches is necessary. The authors hope the present study will aid those who are responsible for the repair of damaged aircraft structures and also provide general repair guidelines.

Keywords

References

  1. Baker A. A. and Jones R., 1988, 'Bonded Repair of Aircraft Structures,' Kluwer, Academic, Dordrecht
  2. Jones R. and Callinan R. J., 1979, 'Finite Element Analysis of Patched Cracks,' Journal of Struct. Mech., Vol. 7, pp. 107-130 https://doi.org/10.1080/03601217908905315
  3. Jones R., Callinan R. J. and Aggarwal K. C., 1983, 'Analysis of Bonded Repair to Damaged Fibre Composite Structures,' Engineering Fracture Mechanics, Vol. 17, pp.37-46 https://doi.org/10.1016/0013-7944(83)90021-8
  4. Chu R. C. and Ko T. C., 1989, 'Isoparametric Shear Spring Element Applied to Crack Patching and Instability,' Theor. Appl Frac. Mech., 17, pp.93-102 https://doi.org/10.1016/0167-8442(92)90034-U
  5. Park, J. H., Ogiso, T. and Atluri, S. N., 1992, 'Analysis of Cracks inAging Aircraft Structures, With and Without Composite-Patch Repairs,' Computational Mechanics, Vol. 10, pp. 169-201 https://doi.org/10.1007/BF00370088
  6. Chung K. H., Yang W. H. and Cho M. R., 2000, 'Fracture Mechanics Analysis of Cracked Plate Repaired by Patch (II)-The Analysis of Debonding Effect,' Transactions of the Korean Society of Mechanical Engineers, Vol. 24, No.9 September, pp.2246-2251
  7. Chue C. H., Chang L. C. and Tasi J. S., 1994, 'Bonded Repair of a Plate with Inclined Central Crack Under Biaxial Loading,' Composite Structures, Vol. 28, pp. 39-45 https://doi.org/10.1016/0263-8223(94)90004-3
  8. Chung K. H., Yang W. H. and Cho M. R., 2000, 'Fracture Mechanics Analysis of Cracked Plate Repaired by Composite Patch.' Key Engineering Materials, Vol. 183-187, pp.43-48 https://doi.org/10.4028/www.scientific.net/KEM.183-187.43
  9. Smith R. N. L., 1988, 'The Solution of Mixed-mode Fracture Problems Using the Boundary Element Method,' duddlEngng. Anal., Vol. 5, pp.75-80 https://doi.org/10.1016/0264-682X(88)90041-X
  10. Cook R. D., Malkus D. S. and Plesha M. E., 1989, 'Concepts and Applications of Finite Element Analysis,' John Wiley & Sonsm Inc., Third Edition, pp. 247-250
  11. Ingraffea A. R., 1980, 'Stress Intensity Factor Computation in Three Dimensions with Quarter Point Element,' International Journal of Numerical Meth. Eng., pp. 1427-1445 https://doi.org/10.1002/nme.1620151002
  12. Erdogan F. and Sih G. C., 1963, 'On the Crack Extension in Plates Under Plane Loading and Transverse Shear,' Journal of Basic Engineering, Trans. ASME 85D, pp. 519-527
  13. Sih, G. C., 1974, 'Strain-Energy-Density Factor Applied to Mixed Crack Problems,' Int. J. Frac .. Vol. 10, No.3. pp. 305-321 https://doi.org/10.1007/BF00035493