Improved energy-absorbing seats are desired for use in fixed and rotary-wing aircraft seats. Energy-absorbing seats have been developed to reduce occupant loads during a crash, where high g-levels are encountered. While the implementation of these seats have greatly improved crash survivability, further improvements are possible, not only in the energy absorbing capability of the seats, but also in the in the interface between the seat and the airframe. If the seat tears away from the airframe, even an ideal energy-absorbing seat would not be effective. This paper presents results from research on the unique deformation properties of Nickel Titanium (NiTi) alloys as they apply to crashworthy seats. The alloy is known for two unique properties: 1) superelasticity, and 2) shape memory, but the NiTi was found to exhibit very large plastic strains under certain secondary annealed and cold worked conditions. This plastic deformation allows for the absorption of many times more strain energy than the superelastic behavior alone, with maximum elongation as high as 90% observed. The material characterization findings showed that Nitinol does have an optimal processing that allows for a maximum amount of energy absorption. The optimal heat treatment, amount of cold work, and form factor were identified. Horizontal sled impact tests of seat concepts integrating NiTi-based energy absorbers for large transport aircraft were tested. The results showed that Nitinol reduced the maximum level of acceleration acting on a passenger during a crash. NiTi also was suggested for use in highly loaded and highly deformable interface fittings.


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    Titel :

    Energy absorbing technology for crashworthy seats


    Beteiligte:


    Erscheinungsdatum :

    2005


    Format / Umfang :

    11 Seiten, 15 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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