Abstract
We describe slow crack growth in ceramics within a cohesive zone methodology. Stress corrosion being thermally activated, a rate and temperature dependent formulation is considered to mimic the chemical reaction-rupture mechanism underlying failure. The effect of humidity is incorporated through a dependence of the activation energy, that facilitates the fracture process with increasing humidity. As a cohesive zone provides an intrinsic length scale, size effects due to the initial crack tip radius on the onset of crack propagation are addressed, opening the route to study the grain size effect on the slow crack growth observed in ceramics polycrystals.
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