The postbuckling behavior of joined-wing configurations has not been fully addressed in the past. This topic is extensively discussed in this work. Starting from a baseline configuration, geometrical parameters as well as wings' load repartition are varied to assess their influence on buckling occurrence. The snap-buckling phenomenon and postcritical pattern are investigated with the adoption of the arc-length technique. The complex load transferring through the joint induces a deformation shape that can no longer carry additional load after a critical point is reached. An abrupt snap to a configuration that is not continuously adjacent to the previous one is then observed. Comparison with the instability state obtained via eigenvalue analysis demonstrates that buckling prediction through linear-buckling analysis is inadequate, and often, the actual critical load is overestimated. This study shows that, for PrandtlPlane joined-wing configurations, increasing the height-to-wingspan ratio is beneficial as far as structural response is concerned. This provides an important design guideline because it is well known from previous studies that high height-to-wingspan ratio decreases the induced drag and fuel consumption. The lift repartition and its effects on buckling show that an improvement of the structural stability of the joined-wing airplane can then be achieved by increasing the amount of aerodynamic load on the upper wing while reducing the lift on the lower wing. The strong bending-torsion coupling typical of highly swept joined wings and its influence on the postcritical response are also investigated and discussed.


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    Titel :

    Postcritical analysis of PrandtlPlane joined-wing configurations


    Weitere Titelangaben:

    Postkritische Analyse von verbundenen Flügelkonfigurationen (Prandtl-Flügel)


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 51 , 1 ; 161-177


    Erscheinungsdatum :

    2013


    Format / Umfang :

    17 Seiten, 43 Bilder, 45 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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    Demasi, Luciano / Cavallaro, Rauno / Márquez Razón, Alan | AIAA | 2012


    Nonlinear Analysis of PrandtlPlane Joined Wings: Effects of Anisotropy

    Cavallaro, Rauno / Demasi, Luciano / Passariello, Andrea | AIAA | 2014


    PrandtlPlane Joined Wing: Body Freedom Flutter, Limit Cycle Oscillation and Freeplay Studies

    Cavallaro, Rauno / Demasi, Luciano / Bombardieri, Rocco et al. | AIAA | 2015


    PrandtlPlane Joined Wing: Body Freedom Flutter, Limit Cycle Oscillation and Freeplay Studies (AIAA 2015-1184)

    Cavallaro, Rauno / Demasi, Luciano / Bombardieri, Rocco et al. | British Library Conference Proceedings | 2015