Impact Testing and Simulation of a Crashworthy Composite Fuselage Section.pdfVIP

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Impact Testing and Simulation of a Crashworthy Composite Fuselage Section.pdf

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Impact Testing and Simulation of a Crashworthy Composite Fuselage Section

1Impact Testing and Simulation of a Crashworthy Composite Fuselage Section with Energy-Absorbing Seats and Dummies Edwin L. Fasanella and Karen E. Jackson e.l.fasanella@larc.nasa.gov, k.e.jackson@larc.nasa.gov US Army Research Laboratory, Vehicle Technology Directorate Hampton, Virginia Abstract A 25-ft/s vertical drop test of a composite fuselage section was conducted with two energy-absorbing seats occupied by an- thropomorphic dummies to evaluate the crashworthy features of the fuselage section and to determine its interaction with the seats and dummies. The 5-ft. diameter fuselage section consists of a stiff structural floor and an energy-absorbing subfloor constructed of Rohacel foam blocks. The experimental data from this test were analyzed and correlated with predictions from a crash simulation developed using the nonlinear, explicit transient dynamic computer code, MSC.Dytran. The anthropo- morphic dummies were simulated using the Articulated Total Body (ATB) code, which is integrated into MSC.Dytran. Introduction A research program was conducted at NASA Langley Re- search Center to develop an innovative and cost-effective crashworthy fuselage concept for light aircraft and rotor- craft [1-3]. The composite fuselage concept was designed to meet structural and flight-load requirements and to provide improved crash protection. The two primary de- sign goals for crashworthiness are to limit the impact forces transmitted to the occupants, and to maintain the structural integrity of the fuselage to ensure a minimum safe occupant volume. To meet these objectives, an air- craft or rotorcraft fuselage must be designed for high stiff- ness and strength to prevent structural collapse during a crash. Yet, the fuselage design must not be so stiff that it transmits or amplifies high impact loads to the occupants. Ideally, the design should contain some crushable ele- ments to help limit the loads transmitted to the occupant to survivable or non-injurious levels.