Abstract
Fatigue cracks in FCC single crystals often propagate along planar slip bands which form on {111} planes ahead of the propagating crack. Such crystallographic crack propagation behavior, which develops even in sharp notched fatigue specimens subjected to mode I loading, is not predicted by any of the currently available criteria for determining crack plane orientation under mixed mode loading conditions. In this paper the following hypothesis is investigated: Crack propagation occurs such that a cracked body's global dissipation rate is maximized. This maximal dissipation rate criterion is developed via consideration of a simple energy balance. The criterion is shown to be equivalent under certain conditions to a form of the maximum energy release rate criterion. A special case of the criterion applicable to planar slip band cracks in FCC single crystals is also developed.
Published Version
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