A chemical kinetics model for glass fracture
- Sandia National Labs., Albuquerque, NM (United States)
The authors utilize a chemical-kinetics-based model to describe the rate of crack extension in vitreous silica as a function of the applied stress and the presence of reactive species. Their approach builds upon previous fracture models that treat the atomic bond rupture process at the crack tip as a stress-enhanced hydrolysis reaction. They derive the stress dependence for siloxane hydrolysis from measurements of hydrolysis rates for strained silicate ring structures. The stress dependence determined for siloxane hydrolysis yields an activation volume of 2.0 cm[sup 3]/mol, which is in good agreement with the stress dependence determined for silicate glass fracture. This result supports previous fracture models that are based on absolute reaction rate theory and predicts an exponential dependence of crack extension rate on applied stress intensity.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5840749
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:10; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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