STP445

    Effect of External Hydrostatic Pressure on Damaged Glass Hydrospheres

    Published: Jan 1969


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    Abstract

    As the external hydrostatic pressure around a hollow glass vessel is increased, the damage to the vessel that may result from point-impact loads is reduced. The effect of hydrostatic pressure on conical cracks in the shell of hollow glass spheres is dependent on the magnitude of the pressure, the time under load, and the depth of the initial flaw. It is relatively independent of the pressurizing medium. Bare conical cracks may initially spall under compressive stresses in the glass of 45,000 psi, whereas sealing the surface of the cracks by adhesive cellulose tape prevents spalling at stresses as high as 148,000 psi. The compressive stress needed to initiate flaking in a damaged glass hydrosphere is approximately the same as that needed to cause flaking in a glass rod under compressive end load.

    Keywords:

    deep submergence, glass, hydrosphere, crack propagation, damage, stresses, evaluation, tests


    Author Information:

    Outwater, JO
    Professor and research assistant, The University of Vermont, Burlington, Vt.

    Austin, LE
    Professor and research assistant, The University of Vermont, Burlington, Vt.


    Paper ID: STP32014S

    Committee/Subcommittee: G01.09

    DOI: 10.1520/STP32014S


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