This paper quantifies the improved resistance to the consequences of multisite damage (MSD) that can develop in older aircraft provided by new Alcoa aluminium fuselage skin sheet alloy 2524-T3. Results from three types of tests are presented for 2524-T3 and the incumbent fuselage skin sheet alloy 2024-T3: 1. residual strength tests to assess the effect of multisite damage on residual strength of unstiffened and stiffened flat panels; 2. fatigue tests on unstiffened flat panels to assess the effects of multisite damage on fatigue life; and 3. fatigue tests on multihole coupons with and without prior corrosion to evaluate the resistance of each alloy to naturally occuring MSD. The results indicate that alloy 2524 offers improved structural damage tolerance in the presence of MSD due to its superior fatigue crack growth resistance and fracture toughness and is more resistant to MSD from corrosion in bare sheet form. The residual strength of 2524 panels containing a lead crack with MSD at adjacent holes was 8.8 to 10.4 % higher than 2024 panels and the average fatigue life 27 to 45 % longer depending on MSD flaw size. The two alloys had equivalent resistance to MSD from fatigue alone but the mean flaw areas following corrosion and fatigue were 18 % smaller in bare 2524 than in bare 2024 and the corroded area alone 32 % smaller. Potential advantages of the improved damage tolerance of 2524-T3 to aircraft manufacturer/operators are weight savings, lower operating costs, easier inspectability and increased safety.


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    Title :

    Benefits of improved fuselage skin sheet alloy 2524-T3 in multisite damage scenarios


    Additional title:

    Erhöhte Beständigkeit der Legierung 2524-T3 gegen MSD beim Einsatz für Flugzeugrümpfe


    Contributors:
    Bray, G.H. (author) / Bucci, R.J. (author) / Kulak, M. (author) / Warren, C.J. (author) / Grandt, A.F. jun. (author) / Golden, P.J. (author) / Sexton, D.G. (author)

    Published in:

    Light Metal Age ; 56 , 11/12 ; 20-28


    Publication date :

    1998


    Size :

    5 Seiten, 6 Bilder, 6 Tabellen, 11 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Benefits of Improved Fuselage Skin Sheet Alloy 2524-T3 in Multi-Site Damage Scenarios

    Bray, G. H. / Bucci, R. J. / Kulak, M. et al. | British Library Conference Proceedings | 1999



    Structural integrity of fuselage panels with multisite damage

    Park, Jai H. / Singh, Ripudaman / Pyo, Chang R. et al. | AIAA | 1995