Net shape investment castings are being specified for an increased number of small and medium size airframe structures. Dramatic cost reductions have been realized without weight increase or impact on safety margins, when replacing traditional machined from solid components (hogouts) or fabricated sheet metal components with high integrity D357 aluminum alloy castings. Aircraft structures have designs based upon either safe life or damage tolerant criteria, specifying critical material requirements for either ultimate load, yield strength, fatigue, fracture toughness or crack propagation. Design of efficient cast structures will capitalize upon the predictable isotropic properties of monolithic structures without the allowance for fastener flexibility or joint failure. Critical success factors for implementation include teaming with qualified suppliers, concurrent engineering with the supplier, and product as well as process qualification for critical material properties. Cercast Group has developed and demonstrated the technology required to meet and exceed existing specifications, and is dedicated to expanding the public data base for static and dynamic mechanical properties. As the quest for performance and best value improvements continue, new technologies such as consistent quality isotropic investment castings will find growing acceptance and place among demanding structures. The ability to combine numerous assemblies into a single structure serves also to reduce logistics problems for the airframer and free up valuable and expensive manufacturing space for assembly of the aircraft.


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    Title :

    Design and specification of aluminum airframe structural castings


    Additional title:

    Entwurf und Spezifizierung von Aluminiumgußstücken für die Flugzeugzelle


    Contributors:


    Publication date :

    1996


    Size :

    20 Seiten, 23 Bilder, 13 Tabellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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