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A Chemical Kinetics Model for Glass Fracture
Author(s) -
Michalske Terry A.,
Bunker Bruce C.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03989.x
Subject(s) - siloxane , silicate , materials science , kinetics , stress intensity factor , fracture (geology) , stress (linguistics) , hydrolysis , composite material , reaction rate , exponential function , volume (thermodynamics) , fracture mechanics , thermodynamics , chemistry , catalysis , organic chemistry , mathematics , physics , mathematical analysis , linguistics , philosophy , quantum mechanics , polymer
We 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. Our approach builds upon previous fracture models that treat the atomic bond rupture process at the crack tip as a stressenhanced hydrolysis reaction. We 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 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.