The DYnamic Crash Analysis of STructures (DYCAST) crash analysis code was used to simulate the vertical impact response of two fuselage sections of the all-composite Lear Fan 2100 General Aviation aircraft. One fuselage section was tested in the unmodified condition, with the existing rigid subfloor in place. The second fuselage section was modified by replacing the rigid subfloor with an energy absorbing subfloor. The DYCAST analysis results for both the unmodified and modified Lear Fan fuselage sections agreed well with the experimental data. The DYCAST analyses predicted the type and location of damage to the sections using a simple ultimate strain failure model. Experimental results from the Lear Fan testing program were used in the development of DYCAST models of three fuselage design concepts. The first fuselage concept is typical of conventional design and consists of a composite frame-reinforced fuselage shell with a stiff subfloor. The second fuselage concept is a retrofit of the previous design in which the rigid subfloor is replaced with a composite energy absorbing subfloor. The third fuselage concept is an innovative design which features a stiff 'inner' fuselage intended to provide a protective shell surrounding the occupants, with a frangible 'outer' shell which encapsulates an energy absorbing subfloor. The DYCAST models of the three fuselage concepts were analyzed for the same impact and loading conditions. A comparison of the response of the simulated occupant indicates a 25 % reduction in vertical acceleration for the retrofit fuselage concept and a 50 % reduction in vertical acceleration for the innovative third fuselage concept when compared with the conventional fuselage concept.
Analytical crash simulation of three composite fuselage concepts and experimental correlation
Analytische Crash-Simulationen von drei Verbund-Flugzeugrumpfkonzepten and die experimentelle Korrelation
Journal of the American Helicopter Society ; 42 , 2 ; 116-125
1997
10 Seiten, 24 Bilder, 16 Quellen
Aufsatz (Zeitschrift)
Englisch
Analytical Crash Simulation of Three Composite Fuselage Concepts and Experimental Correlation
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