SYMPOSIA PAPER Published: 01 January 1969
STP32014S

Effect of External Hydrostatic Pressure on Damaged Glass Hydrospheres

Source

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.

Author Information

Outwater, JO
The University of Vermont, Burlington, Vt.
Austin, LE
The University of Vermont, Burlington, Vt.
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Details
Developed by Committee: G01
Pages: 41–54
DOI: 10.1520/STP32014S
ISBN-EB: 978-0-8031-4578-8
ISBN-13: 978-0-8031-0706-9