Life Extension Techniques for Aircraft Structures – Extending Durability and Promoting Damage Tolerance through Bonded Crack Retarders

P.E. Irving, X. Zhang, J. Doucet, D. Figueroa-Gordon, M. Boscolo, M. Heinimann, G. Shepherd, M.E. Fitzpatrick, D. Liljedahl

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Citations (Scopus)

Abstract

This paper explores the viability of the bonded crack retarder concept as a device for life extension of damage tolerant aircraft structures. Fatigue crack growth behaviour in metallic substrates with bonded straps has been determined. SENT and M(T) test coupons and large scale skin-stringer panels were tested at constant and variable amplitude loads. The strap materials were glass fibre polymer composites, GLARE, AA7085 and Ti-6Al-4V. Comprehensive measurements were made of residual stress fields in coupons and panels. A finite element model to predict retardation effects was developed. Compared to the test result, predicted crack growth life had an error range of -29% to 61%. Mechanisms and failure modes in the bonded strap reinforced structures have been identified. The strap locally reduces substrate stresses and bridges the crack faces, inhibiting crack opening and reducing crack growth rates. In the absence of residual stress, global stiffness ratio accounts for effects of both strap modulus and strap cross section area. In elevated temperature cure adhesives, retardation performance was best in aluminium and GLARE strap materials, which have the closest thermal expansion coefficient to the substrate. Strap materials of high stiffness and dissimilar thermal expansion coefficient such as titanium had poor retardation characteristics.
Original languageEnglish
Title of host publicationICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives
PublisherSpringer Verlag
Pages753-770
ISBN (Print)978-94-007-1663-6
DOIs
Publication statusPublished - 2011

Fingerprint

Damage tolerance
Durability
Aircraft
Cracks
Thermal expansion
Crack propagation
Residual stresses
Substrates
Stiffness
Stringers
Fatigue crack propagation
Glass fibers
Failure modes
Adhesives
Skin
Titanium
Aluminum
Composite materials
Polymers
Temperature

Bibliographical note

This paper is not on the repository

Keywords

  • Aerospace Technology and Astronautics
  • Structural Materials
  • Engineering Design
  • Engineering Economics
  • Organization
  • Logistics
  • Marketing
  • Quality Control
  • Reliability
  • Safety and Risk
  • Operating Procedures
  • Materials Treatment

Cite this

Irving, P. E., Zhang, X., Doucet, J., Figueroa-Gordon, D., Boscolo, M., Heinimann, M., ... Liljedahl, D. (2011). Life Extension Techniques for Aircraft Structures – Extending Durability and Promoting Damage Tolerance through Bonded Crack Retarders. In ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives (pp. 753-770). Springer Verlag. https://doi.org/10.1007/978-94-007-1664-3_59

Life Extension Techniques for Aircraft Structures – Extending Durability and Promoting Damage Tolerance through Bonded Crack Retarders. / Irving, P.E.; Zhang, X.; Doucet, J.; Figueroa-Gordon, D.; Boscolo, M.; Heinimann, M.; Shepherd, G.; Fitzpatrick, M.E.; Liljedahl, D.

ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives. Springer Verlag, 2011. p. 753-770.

Research output: Chapter in Book/Report/Conference proceedingChapter

Irving, PE, Zhang, X, Doucet, J, Figueroa-Gordon, D, Boscolo, M, Heinimann, M, Shepherd, G, Fitzpatrick, ME & Liljedahl, D 2011, Life Extension Techniques for Aircraft Structures – Extending Durability and Promoting Damage Tolerance through Bonded Crack Retarders. in ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives. Springer Verlag, pp. 753-770. https://doi.org/10.1007/978-94-007-1664-3_59
Irving PE, Zhang X, Doucet J, Figueroa-Gordon D, Boscolo M, Heinimann M et al. Life Extension Techniques for Aircraft Structures – Extending Durability and Promoting Damage Tolerance through Bonded Crack Retarders. In ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives. Springer Verlag. 2011. p. 753-770 https://doi.org/10.1007/978-94-007-1664-3_59
Irving, P.E. ; Zhang, X. ; Doucet, J. ; Figueroa-Gordon, D. ; Boscolo, M. ; Heinimann, M. ; Shepherd, G. ; Fitzpatrick, M.E. ; Liljedahl, D. / Life Extension Techniques for Aircraft Structures – Extending Durability and Promoting Damage Tolerance through Bonded Crack Retarders. ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives. Springer Verlag, 2011. pp. 753-770
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