Hostname: page-component-cc8bf7c57-j4qg9 Total loading time: 0 Render date: 2024-12-11T23:10:19.239Z Has data issue: false hasContentIssue false

Numerical study of balanced patch repairs to cracked sheets

Published online by Cambridge University Press:  04 July 2016

A. Young
Affiliation:
Materials and Structures Department, Royal Aerospace Establishment, Farnborough
D. P. Rooke
Affiliation:
Materials and Structures Department, Royal Aerospace Establishment, Farnborough
D. J. Cartwright
Affiliation:
Department of Mechanical Engineering, Bucknell University, Lewisburg Pa 17837, USA

Summary

The effects on the stress intensity factor of bonding repair patches over a crack in a large sheet under uniaxial loading are studied using two simple numerical models. The variation of the stress intensity factor with increasing crack length is investigated and results for repairs involving large elliptical patches are found to agree with a closed-form approximation. Further cases are considered where the patch is either rectangular in shape or less than a certain critical size. For such repairs the closed-form approximation for the stress intensity factor is shown to be unsuitable.

Type
Research Article
Copyright
Copyright © Royal Aeronautical Society 1989 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Formerly University of Southampton

References

1. Baker, A. A. and Jones, R. (Eds). Bonded Repair of Aircraft Structures, Martinus Nijhoff, Dordrecht, 1988.Google Scholar
2. Sutton, G. R., Stone, M. H., Poole, P. and Wilson, R. N. The repair of fatigue cracked components by adhesively bonded patches.. In: Repair and Reclamation (edited by Dolby, R. E. and Kent, K. G.), 1984, pp 153158, The Welding Institute.Google Scholar
3. Poole, P., Stone, M. H., Sutton, G. R. and Wilson, R. N. Effect of Adhesive bonding variables on the performance of bonded CFRP patch repairs of metallic structures. The Repair of Aircraft Structures Involving Composite Materials, 62nd S&M Panel Meeting, 1986, AGARD, Oslo.Google Scholar
4. Baker, A. A. Fibre composite repair of cracked metallic aircraft components — practical and basic aspects. The Repair of Aircraft Structures Involving Composite Materials, 62nd S&M Panel Meeting, 1986, AGARD, Oslo.Google Scholar
5. Rose, L. R. F. A cracked plate repaired by bonded reinforcements, Int J Fract, 1982, 18, pp 135144.Google Scholar
6. Rose, L. R. F. An application of the inclusion analogy for bonded reinforcements. Int J Solids Struct, 1981, 17, pp 827 838.Google Scholar
7. Dowrick, G. Stress Intensity Factors for Cracks in Patched and Orthogonally Stiffened Sheets. PhD Thesis, 1987, University of Southampton.Google Scholar
8. Dowrick, G., Cartwright, D. J. and Rooke, D. P. The effects of repair patches on the stress distribution in a cracked sheet. Proceedings of the 2nd International Conference on Numerical Methods in Fracture Mechanics, edited by Owen, D. R. J. and Luxmore, A. R., 1980, pp 763-775, Swansea.Google Scholar
9. Young, A., Cartwright, D. J. and Rooke, D. P. Influence of tapering on the stresses in repair patches. Proceedings 3rd International Conference on Numerical Methods in Fracture Mechanics, edited by A. R. Luxmore and D. R. J. Owen, 1984, pp 721-737, Swansea.Google Scholar
10. Young, A., Cartwright, D. J. and Rooke, D. P. Model studies of repair patches. Proceedings of the ASM International Conference on Fatigue, Corrosion, Cracking, Fracture Mechanics and Failure Analysis. 1985, pp 339-346, Salt Lake City, Utah, USA.Google Scholar
11. Young, A. Analysis of Bonded Repair Patches on Cracked Thin Sheets. PhD Thesis, 1988. University of Southampton.Google Scholar
12. Jones, R. and Callinan, R. J. Finite element analysis of patched cracks. J Struct Mech, 1979, 7, pp 107130.Google Scholar
13. Jones, R. and Callinan, R. J. A design study in crack patching. J Fibre Sci Technol, 1981, 14, pp 99111.Google Scholar