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    • CALLISTO project – Mechanical architecture and structural design challenges in the frame of a reusable first stage demonstration vehicle

    Paper number

    IAC-18,D2,6,4,x47124

    Author

    Ms. Olga Diaz Lopez, France, Centre National d'Etudes Spatiales (CNES)

    Coauthor

    Mr. Sergio Lopez Moreno, France, Centre National d'Etudes Spatiales (CNES)

    Coauthor

    Mr. Jean Desmariaux, France, Centre National d'Etudes Spatiales (CNES)

    Year

    2018

    Abstract
    In the frame of future launchers preparation, CNES, JAXA and DLR are working all together to develop a reduced-scale vehicle named CALLISTO (Cooperative Action Leading to Launcher Innovation in Stage Toss-back Operations). The aim of the project is to demonstrate first stage recovery, revalidation and reuse capabilities. The vehicle uses a reusable LH2/LOX engine and it has a diameter of around 1 meter, a total length of around 13 meter and a total mass of around 4 tons. 
Launcher structures are designed and sized in order to optimize mass while respecting a system reliability requirement. In order to do so, safety factors and margin policy are used in structural sizing. Since CALLISTO vehicle is a demonstrator, reliability requirement is not the same that for operational launchers. However, this vehicle is faced to an additional challenge: reusability. A compromise is needed between structural design for mass optimization, damage tolerance and demonstrator reliability requirement, assuring in any case that structures do not jeopardize the demonstration. Additionally, for most of the structures, since a single specimen will be manufactured, we could take benefit of material real characteristics instead of material statistical allowable used for the design for consolidating the margin of safety budget in order to bring growth potential for further demonstration purposes. 
On this paper, a focus of the main design challenges for the LH2 tank and the equipment bay is done. Since the vehicle has a reduced size, different issues regarding thin structures are faced such as manufacturing capabilities or crack propagation and NDI means for space applications.
    Abstract document

    IAC-18,D2,6,4,x47124.brief.pdf

    Manuscript document

    IAC-18,D2,6,4,x47124.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.