Bonded composite reinforcements, such as boron/epoxy or carbon/epoxy, are becoming widely used to repair fatigue or stress corrosion cracks in aluminium alloy aircraft components. They also have considerable potential as repairs for corrosion damage, although the non-discrete nature of corrosion damage is a considerable complication. This paper describes studies on bonded repairs of two types of typical corrosion damage, both of which cause a dramatic reduction in fatigue life: a) relatively severe exfoliation and b) relatively minor pitting. Both studies are based on earlier Australian experimental studies on the structural significance of corrosion. In the studies described in this paper, other than the standard surface treatment used to attach the reinforcement no attempt was made to remove the corrosion damage. It is concluded that bonded repairs can provide useful fatigue life recovery even with serious exfoliation damage; however, such repairs should be regarded only as a temporary measure. For permanent and far more effective repairs most of the damage should be removed (ground-out) prior to reinforcement. In contrast, with minor pitting, greater than full life recovery is feasible. This observation also leads to the conclusion that bonded repairs will be tolerant of minor pitting inadvertently left after grind-out. Strain reduction by the reinforcement, as expected, is the major contributor to life extension. However, in the case of minor pitting environmental isolation by the adhesive is probably highly beneficial. Residual stresses in the metal resulting from the composite reinforcement causes some loss in patching efficiency.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Fatigue life recovery in corroded aluminium alloys using bonded composite reinforcements


    Beteiligte:
    Baker, Alan A. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2006


    Format / Umfang :

    20 Seiten, 8 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Crack Growth in Aluminium Plates Repaired with Composite Reinforcements

    Aakkula, J. J. / Saarela, O. / International Committee on Aeronautical Fatigue | British Library Conference Proceedings | 1995


    Fatigue Evaluation of Thick Monolithic Aluminium Structures Repaired Using Composite Bonded Doublers

    Roberge, J. F. / Zgela, M. B. / Neale, K. W. et al. | British Library Conference Proceedings | 2002


    Fatigue life recovery in aluminium alloy aircraft structure

    Sharp, P.K. / Liu, Q. / Barter, S.A. et al. | Tema Archiv | 2002


    ColdShield Qualification: Waterproof Bonded Composite Reinforcements for FPSO HULL Repair - Seal Selection

    Court, J.-P. / Geffroy, R.-L. / Lewandowski, A. et al. | British Library Conference Proceedings | 2013


    Static and Fatigue Behaviour of Aluminium Bonded Joints

    Teixeira, L. M. / Camanho, P. P. / Fernandes, A. A. et al. | British Library Conference Proceedings | 2001