The allowable load bearing capacity of undamaged thin-walled stringer stiffened carbon fibre reinforced plastic (CFRP) panels loaded in compression is currently limited by its buckling load. The extension to a novel stability design scenario - to permit postbuckling under ultimate load or even more progressive to move ultimate load close to collapse - requires validated simulation procedures for this highly nonlinear topic for fast tools in the early design phase up to numerical analysis within the certification process. Different aspects of the validation process with respect to experimental investigations, nonlinear FE analysis as well as the comparison on different levels of detail are highlighted. It has been shown that the pre-test planning and analysis is crucial for a reliable and goal oriented validation of numerical results, which finally leads to the need of real validation test rather then phenomenological expriments to obtain a principle physical understanding. The numerical approach detailed allows a sufficient accurate nonlinear calculation of the considered stiffened CFRP structures. Within the validation process it has been pointed out that different levels of detail have to be examined to obtain a broader idea of how well the numerical results represent the experimental data. The question which now arises is, to which extend the validated results for a specific test specimen allow a transfer to different configurations of stringer stiffened CFRP-panels (e.g. change in lay-up, stringer spacing, radius of curvature or dimension/level of the structural component). Or the other way around, how many predefined test specimens are necessary to validate a desired parametric design space for this aircraft fuselage type of structure.
Validation procedure for nonlinear analysis of stringer stiffened CFRP panels
Validierungsmethode für die nichtlineare Analyse von stringerversteiften CFK-Paneelen
2006
8 Seiten, 10 Bilder, 10 Quellen
Aufsatz (Konferenz)
Englisch
CFK (carbonfaserverstärkter Kunststoff) , Versteifung , Validierung , Tragfähigkeit , Druckbeanspruchung , Knickbeanspruchung , numerische Analyse , Zertifizierung , experimentelle Untersuchung , Finite-Elemente-Methode , Versuchsplanung , Prüfling , Krümmungsradius , Flugzeugrumpf , Entwurfsparameter
VALIDATION PROCEDURE FOR NONLINEAR ANALYSIS OF STRINGER STIFFENED CFRP PANELS
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