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Response of fibre reinforced aluminium–lithium laminates to different fatigue conditions

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Abstract

Under fatigue conditions fibre reinforced aluminium–lithium laminates do not respond in the same manner as monolithic aluminium alloys. The variation of fatigue crack growth rates with initial loading condition has been examined for both carbon and glass fibre reinforced laminates, and compared with the behaviour of unreinforced 8090 aluminium–lithium alloy for a range of conditions (different initial nominal stress intensity factor range, load range and reversed loading). During fatigue, cracks grow in the metal layers of these laminates whilst the fibres in the crack wake remain intact, bridging the crack faces. The fibre bridging mechanism, inherent in this laminate system, reduces the fatigue crack growth rate. The magnitude of the bridging effect appears to be inversely related to the applied load range. This relationship can account for the behaviour observed in the performed experiments.

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References

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Authors and Affiliations

  1. Department of Engineering Materials, University of Southampton, Southampton, UK

    S. B. Davenport

  2. Structural Materials Centre, DRA, Farnborough, UK

    P. J. Gregson

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  1. S. B. Davenport
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  2. P. J. Gregson
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  3. R. Moreton
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  4. C. J. Peel
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Davenport, S.B., Gregson, P.J., Moreton, R. et al. Response of fibre reinforced aluminium–lithium laminates to different fatigue conditions. Journal of Materials Science 32, 6555–6560 (1997). https://doi.org/10.1023/A:1018619512832

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  • DOI: https://doi.org/10.1023/A:1018619512832

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