Journal ArticleDOI
Micromechanisms of crack growth in ceramics and glasses in corrosive environments
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TLDR
In this paper, the basic rate equation from chemical reaction rate theory is modified to reflect physical and chemical processes which occur at crack tips, based on the assumption that the crack tip can be modelled as an elastic continuum, an assumption that is supported by a simple atomistic model of crack growth.Abstract:
At normal temperatures and pressures water is known to have a strong influence on the strength of ceramics and glasses. Behaving as a stress corrosion agent, water causes these materials to fail prematurely as a consequence of subcritical crack growth. A basic premise of this paper is that stress corrosion cracking of ceramics is a chemical process which involves a stress-enhanced chemical reaction between the water and the highly stressed ceramic near the crack tip. Plastic deformation is believed to play no role in this fracture process. After a brief survey of chemical reaction rate theory, the basic rate equation from this theory is modified to reflect physical and chemical processes which occur at crack tips. Modification of the rate equation is based on the assumption thatl the crack tip can be modelled as an elastic continuum, an assumption that is supported by a simple atomistic model of crack growth. When tested against experimental data collected on glass the theory was found to be consi...read more
Citations
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Journal ArticleDOI
A molecular interpretation of stress corrosion in silica
TL;DR: In this article, a detailed chemical model for the interaction of the environment with mechanically strained bonds in the solid at the tip of a crack was proposed, which has implications for the long-term strength behavior of a wide variety of brittle materials.
Journal ArticleDOI
Slow fracture model based on strained silicate structures
T. A. Michalske,B. C. Bunker +1 more
TL;DR: In this paper, a model is developed based on chemically active bond defects generated by the strain field of the crack tip of the Si-O-Si bond, and a two-dimensional fracture model involving kink site nucleation and motion is developed.
Journal ArticleDOI
Simulating stress corrosion with a bonded-particle model for rock
TL;DR: In this paper, a numerical model for rock that extends the formulation of the bonded-particle model (BPM) to include time-dependent behavior by adding a damage-rate law to the parallel-bond formulation is described.
Journal ArticleDOI
Effects of water and other dielectrics on crack growth
TL;DR: In this paper, the effects of water and a variety of organic liquids on crack-growth rates in soda-lime-silica glass was investigated when water is present in organic liquids, it is usually the principal agent that promotes subcritical crack growth in glass.
Journal ArticleDOI
Subcritical crack growth, surface energy, fracture toughness, stick-slip and embrittlement
TL;DR: In this paper, it was proposed that the difficulties encountered with the meaning of subcritical crack growth arose from a misunderstanding of the Griffith equation, and the following equation, well verified for adherence of elastomers, G−2γ=2γφT(v) where φT (v) is related to viscoelastic losses or internal friction at the crack tip, is generalized to other materials.
References
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Book
Physical chemistry of surfaces
TL;DR: In this paper, the authors discuss the nature and properties of liquid interfaces, including the formation of a new phase, nucleation and crystal growth, and the contact angle of surfaces of solids.
Book
Fracture Mechanics of Ceramics
TL;DR: In this article, a linear-elastic fracture mechanics can be applied to describe the failure behavior of small flaws in ceramic materials, which is caused by the extension of small faults.
Journal ArticleDOI
Some applications of the transition state method to the calculation of reaction velocities, especially in solution
Journal ArticleDOI
Influence of Water Vapor on Crack Propagation in Soda‐Lime Glass
TL;DR: In this article, the double-cantilever cleavage technique was used to observe crack motion and to accurately measure crack velocities in glass, where the measured crack velocity is a complicated function of stress and of water vapor concentration in the environment.