STP1332

    High-Speed Civil Transport Hybrid Laminate Sandwich Fuselage Panel Test

    Published: Jan 1999


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    Abstract

    Hybrid laminates consisting of interspersed titanium foils and carbon fiber-reinforced polymer-matrix composite (PMC) plies are among the leading material candidates for High-Speed Civil Transport (HSCT) primary structure. To demonstrate the feasibility of fabricating large adhesive bonded honeycomb sandwich subcomponents with hybrid laminate facesheets, a 1.9-meter radius × 3.0-meter long curved panel representative of the HSCT forward fuselage was built and tested. The subcomponent was first tested to twice the equivalent constant-load amplitude fatigue design service objective (66 000 cycles). The panel ran for another full design service objective with longitudinal notches, plus an additional 2 500 cycles with a circumferential notch. Finally, the panel was successfully tested to approximate regulatory residual strength load requirements (1.15 × max. fatigue loads). These tests demonstrated at a subcomponent level the durability of titanium/carbon fiber-reinforced PMC laminates and confirmed the hypothesis that fiber bridging can significantly retard the rate at which damage progresses from a crack-like defect in these materials.

    Keywords:

    High-Speed Civil Transport, hybrid laminates, honeycomb sandwich, composite materials, durability, damage tolerance


    Author Information:

    Miller, M
    Manager, Principal Engineer, and Senior Principal Engineer, HSCT Structures, Boeing Commercial Airplane Group, Seattle, WA

    Rufin, AC
    Manager, Principal Engineer, and Senior Principal Engineer, HSCT Structures, Boeing Commercial Airplane Group, Seattle, WA

    Westre, WN
    Manager, Principal Engineer, and Senior Principal Engineer, HSCT Structures, Boeing Commercial Airplane Group, Seattle, WA

    Samavedam, G
    Division Manager, Structures & Transportation Technology, Foster-Miller, Inc., Waltham, MA


    Paper ID: STP14979S

    Committee/Subcommittee: E08.09

    DOI: 10.1520/STP14979S


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