The forces of interaction between smooth silica surfaces in contact has been investigated in order to contribute to an understanding of soil behavior in the lunar environment. The normal cohesion between two fused silica spheres (0.1 cm diameter) was measured under ultra-high vaccum conditions (10−9 torr) and in the presence of water vapor (10−9 to 18 torr). The values obtained (5-25 dynes) are essentially independent of the environmental conditions and may be accounted for in terms of the van der Waals “body” forces.In the absence of physically adsorbed water the force required to separate two smooth fused silica spheres in tangential contact is significantly higher than the normal cohesion. The formation of chemical bonds across the unprotected contact interface as a result of micro-sliding is suggested by this observation.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Solid Surfaces in Contact under Extreme Environmental Conditions


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1965 International Automotive Engineering Congress and Exposition ; 1965



    Publication date :

    1965-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Flight testing under extreme environmental conditions

    Hendrickson, Clendon L. | TIBKAT | 1988



    Performance characteristics of lithium-ion technology under extreme environmental conditions

    Smart, M.C. / Ratnakumar, B.V. / Chin, K.B. et al. | Tema Archive | 2003


    Performance Characteristics of Lithium-Ion Technology Under Extreme Environmental Conditions

    Smart, Marshall / Bugga, Ratnakumar / Chin, Keith et al. | AIAA | 2003


    Chromium Composites for Extreme Environmental Conditions

    Masterson, James F. | SAE Technical Papers | 1962