Dimensional stability is an important performance parameter for many space structures. The concept of 'antidistortion appliques' was developed for minimizing thermally induced dimensional instability. The concept involves adding material to offset and eliminate measured instabilities. A computational framework was developed that uses experimental data characterizing the adverse thermal distortions. The computations include a finite element model that embodies the idealized thermoelastic properties of the structure in conjunction with optimization software that drives iterations of the characteristics ofthe antidistortion appliques within the finite element model. In a modeling only study, it was predicted that distortions could be reduced in some cases by more than 90%. In the combined experimental/computational study, the models predicted a 62% reduction in the objective function that characterized the adverse distortions, whereas the experiment that used the applique design generated by the analysis recorded a 78% reduction- The difference can be attributed to several factors. Adjustment of material properties due to manufacturing variations are routinely needed to correlate analytical predictions to match experiment results. Inherently thermal elastic distortion measurements require some level of data adjustment due to the problem of maintaining a reference, which, in itself, does not change shape due to thermal changes.


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    Title :

    Approach for increasing the static dimensional stability of composite space structures


    Additional title:

    Verfahren zur Erhöhung der statischen dimensionalen Stabilität von Raumfahrt-Verbundstrukturen


    Contributors:

    Published in:

    AIAA Journal ; 47 , 4 ; 1005-1013


    Publication date :

    2009


    Size :

    9 Seiten, 15 Bilder, 3 Tabellen, 15 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Approach for Increasing the Static Dimensional Stability of Composite Space Structures

    Garnich, Mark R. / Liu, P. / Akula, V. M. K. et al. | AIAA | 2009



    Theoretical limits of dimensional stability for space structures

    Dolgin, B.P. / Moacanin, J. / O'Donnell, T. | Tema Archive | 1991


    The thermal and mechanical stability of composite materials for space structures

    Tompkins, S. S. / Sykes, G. F. / Bowles, D. E. | NTRS | 1985