Abstract
The following hypothesis has recently been offered for consideration; Crack propagation occurs such that a cracked body 's global dissipation rate is maximized. The present work summarizes results of two recent experimental investigations into the fatigue crack propagation behavior of SRR-99 nickel base superalloy single crystals. Several observations made during the course of these studies are rationalized using a special case of the maximal dissipation rate criterion. It is recalled that the thermodynamic energy balance used to define the dissipation rate also yields a general fatigue crack propagation rate equation. Implications of this equation for the modeling of fatigue crack propagation are briefly discussed.
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