Abstract
| Original language | English |
|---|---|
| Title of host publication | ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives |
| Publisher | Springer Verlag |
| Pages | 753-770 |
| ISBN (Print) | 978-94-007-1663-6 |
| DOIs | |
| Publication status | Published - 2011 |
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Bibliographical note
This paper is not on the repositoryKeywords
- 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
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 proceeding › Chapter
}
TY - CHAP
T1 - Life Extension Techniques for Aircraft Structures – Extending Durability and Promoting Damage Tolerance through Bonded Crack Retarders
AU - Irving, P.E.
AU - Zhang, X.
AU - Doucet, J.
AU - Figueroa-Gordon, D.
AU - Boscolo, M.
AU - Heinimann, M.
AU - Shepherd, G.
AU - Fitzpatrick, M.E.
AU - Liljedahl, D.
N1 - This paper is not on the repository
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
KW - Aerospace Technology and Astronautics
KW - Structural Materials
KW - Engineering Design
KW - Engineering Economics
KW - Organization
KW - Logistics
KW - Marketing
KW - Quality Control
KW - Reliability
KW - Safety and Risk
KW - Operating Procedures
KW - Materials Treatment
U2 - 10.1007/978-94-007-1664-3_59
DO - 10.1007/978-94-007-1664-3_59
M3 - Chapter
SN - 978-94-007-1663-6
SP - 753
EP - 770
BT - ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives
PB - Springer Verlag
ER -