A combination of static and crack growth analysis models were developed to evaluate the impact of exfoliation corrosion and grind-out repairs on remaining fatigue life and residual strength of a wing upper skin. For this purpose a total of 20 dog-bone coupons were modelled, analyzed and validated by test results. A local damage model, based on a soft inclusion concept, was used to model the corroded and grinded coupons. Results showed that the models provided a good estimation of the performance reduction due to the exfoliation or grind-out. For the considered centred circular grind-out repairs, the stress concentration and analytical crack growth life could be correlated well with the maximum thickness loss. Such a relationship was not observed as clearly with the corroded coupons. For future work a combined severity parameter, which includes the effects of corrosion pits and intergranular corrosion, maximum thickness loss, total corrosion volume and damage location, is needed to give a better estimation of the performance of the corroded coupons. The results from the local damage models were applied to a finite element model of an F-5E wing upper skin section. It was shown that for the analyzed wing section, the model could be used to define the most important structural strength criteria, which were the fastener strength, the inter-rivet and the panel buckling behaviour. This information is important when defining repair actions for corrosion damaged wing skins. It was also shown that leaving the corrosion in place gives an advantage in static residual strength, as well as in fatigue strength over grindout repairs. This is true as long as corrosion growth is not a determining factor. These results and conclusions are specific for the considered wing upper skin section under the compression-dominated loading spectrum. A similar approach may be envisaged for the analysis of a tension-dominated lower wing skin where fatigue is of greater concern. The study shows that the models can provide an engineering tool for quick assessment of the effects of exfoliation corrosion damage on wing skins and guidance on possible grind-out repair actions. Further work to develop more holistic models will focus on including short crack growth behaviour and the time-dependent aspect of corrosion pitting and corrosion exfoliation rates.


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    Titel :

    Structural integrity of a wing upper skin with exfoliation corrosion


    Beteiligte:
    Uebersax, Andreas (Autor:in) / Huber, Cyril (Autor:in) / Renaud, Guillaume (Autor:in) / Liao, Min (Autor:in)


    Erscheinungsdatum :

    2009


    Format / Umfang :

    17 Seiten, 18 Bilder, 2 Tabellen, 7 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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