A composite isogrid panel design for application to a rotorcraft fuselage is presented. An optimum panel design for the lower fuselage of the rotorcraft that is subjected to combined in-plane compression and shear loads was generated using a design tool that utilizes a smeared-stiffener theory in conjunction with a genetic algorithm. A design feature was introduced along the edges of the panel that facilitates introduction of loads into the isogrid panel without producing undesirable local bending gradients. A low-cost manufacturing method for the isogrid panel that incorporates these design details is also presented. Axial compression tests were conducted on the undamaged and low-speed impact damaged panels to demonstrate the damage tolerance of this isogrid panel. A combined loading test fixture was designed and utilized that allowed simultaneous application of compression and shear loads to the test specimen. Results from finite element analyses are presented for the isogrid panel designs and these results are compared with experimental results. This study illustrates the isogrid concept to be a viable candidate for application to the helicopter lower fuselage structure.


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    Title :

    Optimal design and damage tolerance verification of an isogrid structure for helicopter application


    Contributors:
    Baker, D.J. (author) / Ambur, D.R. (author) / Fudge, J. (author) / Kassapoglou, C. (author)


    Publication date :

    2003


    Size :

    19 Seiten, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Optimal Design and Damage Tolerance Verification of an Isogrid Structure for Helicopter Application

    Baker, D. / Ambur, D. / Fudge, J. et al. | British Library Conference Proceedings | 2003


    Isogrid structures

    KEY, J. / SLYSH, P. / DYER, J. et al. | AIAA | 1975


    Isogrid structures

    Slysh, P. / Dyer, J. E. / Furman, J. H. et al. | NTRS | 1975


    ISOGRID STIFFENING ELEMENTS

    DUPONT ANTHONY A | European Patent Office | 2018

    Free access