A flight test was conducted and compared with ground test data. Sixteen typical spacecraft material couples were mounted on an experimental research satellite in which a motor intermittently drove the spherical moving specimens across the faces of the fixed flat specimens in an oscillating motion. Friction coefficients were measured over a period of 14-month orbital time. Surface-to-surface sliding was found to be the controlling factor of generating friction in a vacuum environment. Friction appears to be independent of passive vacuum exposure time. Prelaunch and postlaunch tests identical to the flight test were performed in an oil-diffusion-pumped ultrahigh vacuum chamber. Only 50% of the resultant data agreed with the flight data owing to pump oil contamination. Identical ground tests were run in an ultrahigh vacuum facility and a ion-pumped vacuum chamber. The agreement (90%) between data from these tests and flight data established the adequacy of these test environments and facilities. (Author)


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    Titel :

    Cold-Welding Test Environment


    Beteiligte:
    J. T. Wang (Autor:in)

    Erscheinungsdatum :

    1972


    Format / Umfang :

    17 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Cold-welding test environment

    Wang, J. T. | NTRS | 1972


    Cold welding

    Engineering Index Backfile | 1943


    Cold welding

    Engineering Index Backfile | 1948


    Cold welding

    Engineering Index Backfile | 1943