The Vineyard transition-rate theory is applied to a simple, atomistic model of environmentally assisted fracture. The model itself consists of a linear four-atom chain, with nearest-neighbor atoms interacting via Morse-function potentials. Transition rates for crack extension and healing (that is, for opening and closing, respectively, of the central interatomic bond) are calculated as a function of both lattice strain and the extent of assumed environment-induced decohesion of the inner bond, for a fixed value of temperature. © 1984.
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