Damage tolerance analysis (DTA) was considered in the global design optimization of an aircraft wing structure. Residual strength and fatigue life requirements, based on the damage tolerance philosophy, were investigated as new design constraints. The global/local finite element approach allowed local fatigue requirements to be considered in the global design optimization. AFGROW fatigue crack growth analysis provided a new strength criterion for satisfying damage tolerance requirements within a global optimization environment. Initial research with the ASTROS program used this damage tolerance constraint to optimize cracked skin panels on the lower wing of a fighter/attack aircraft. For an aerodynamic and structural model of this type of aircraft, ASTROS simulated symmetric and asymmetric maneuvers during the optimization. Symmetric maneuvers, without underwing stores, produced the highest stresses and drove the optimization of the inboard lower wing skin. Asymmetric maneuvers, with underwing stores, affected the optimum thickness of the outboard hard points. Subsequent design optimizations included DTA and von Mises stress constraints simultaneously. In the configuration with no stores, the optimization was driven by the DTA constraint and, therefore, DTA requirements can have an active role to play in preliminary aircraft design.


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    Title :

    Optimal design of aircraft structures with damage tolerance requirements


    Additional title:

    Schadenstolerante Strukturoptimierung von Flugzeugen


    Contributors:
    Arrieta, A.J. (author) / Striz, A.G. (author)

    Published in:

    Publication date :

    2005


    Size :

    9 Seiten, 11 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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    Arrieta, A. / Striz, A. / American Institute of Aeronautics and Astronautics et al. | British Library Conference Proceedings | 2000


    An approach to the design of aircraft structures with damage tolerance requirements

    Arrieta, Albert / Striz, Alfred / Venkayya, Vipperla | AIAA | 2000


    Optimal design of large structures for damage tolerance

    ARORA, J. S. / HASKELL, D. F. / GOVIL, A. K. | AIAA | 1980