Composite damage tolerance is one of the key areas of concern in the aerospace industry. Damage due to both low and hypervelocity impact can result in appreciable composite strength degradation. Though damage due to hypervelocity impact is generally visible and can be repaired, low velocity impact damage may or may not be visible and is generally hard to repair. This paper evaluates damage tolerance of various graphite/epoxy composite materials for low and hypervelocity impact, For low velocity impact damage evaluation, compression after impact test method was selected. Test data was generated using both NASA (4.27 kJ/m or 960 in. lb/in impact) and Boeing (6.67 kJ/m of 1,500 in. lb/in impact) versions. Various materials (fibers and resins) were evaluated for improving damage tolerance. Graphite fiber forms evaluated include braided preform, fabric and tape. Resin forms used include wet coating, prepreg, film adhesive interleaf and resin transfer molding. Effect of stacking sequence, fiber volume, resin content and specimen thickness has been investigated. Effect of manufacturing defects including voids, debonds and delaminations was studied. NDE technique, ultrasonic C-scan, was used for inspection of damage. In hypervelocity impact damage testing, braided/RTM tube of graphite/epoxy composite Hitex 46-gA/Shell 9405-9470 was found to be more damage tolerant than Hercules IM7/8551-7 tape wrapped tube indicating that for damage tolerance improvement, choice of a tough resin by itself is not sufficient. Fabrication technique plays an equally important role. The interweaving provided by braiding limited fiber tear out to the very local area. Damage area and the weight loss in braided tube were smaller as compared to the tape wrapped tube.


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    Titel :

    Impact damage evaluation of graphite/epoxy composite materials for space applications


    Weitere Titelangaben:

    Bewertung der Stoßschädigung von Carbonfaser/Epoxid-Verbundwerkstoffen für Raumfahrtanwendungen


    Beteiligte:
    Munjal, A.K. (Autor:in) / Rahnenfuehrer, E.W. (Autor:in) / Spencer, D.F. (Autor:in) / Pickett, B.E. (Autor:in) / Maloney, P.F. (Autor:in)


    Erscheinungsdatum :

    1990


    Format / Umfang :

    8 Seiten, 3 Tabellen, 13 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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