Effect of surface stress on stress corrosion of silicate glass
Slow crack growth data, solution analysis and surface stress measurements are used to develop a model to explain the low crack velocity behavior of multicomponent silicate glasses. We show that the low crack velocity plateau previously observed for binary alkali silicate glasses also occurs in sodium borosilicate glasses. Our model for this behavior involves the generation of surface stress on the crack walls behind the crack tip and the effect of the stress to increase the crack tip stress intensity. We find that glasses that show preferential removal of alkali from the surface layer during aqueous corrosion can develop surface tensile stress. Surface stresses on the order of 30 MPa were measured in acidic conditions. Using a simple fracture mechanics formulation, we were able to use our data for leached layer formation rate and development of surface tensile stress to quantitatively predict the onset of a low velocity plateau in sodium borosilicate glasses. 12 refs., 10 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6416286
- Report Number(s):
- SAND-88-3183C; CONF-890310-4; ON: DE89004584
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CHEMICAL REACTIONS
CORROSION
CORROSION FATIGUE
CRACK PROPAGATION
DISSOLUTION
FATIGUE
GLASS
LEACHING
MECHANICAL PROPERTIES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
STRESS ANALYSIS
STRESS CORROSION
SURFACE PROPERTIES