The influence of crack tip plasticity in the growth of small fatigue cracks
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I.
INTRODUCTION
O V E R the last few years, it has become apparent ~'2'3 that the growth of "small" fatigue cracks is anomalous with respect to "large" ones. Specifically, it has been found that microcracks* tend to grow faster than, and below the threshold stress intensity for, large* cracks driven by nominally *Within the context of this paper, "small crack" and "microcrack" will be considered synonymous; "large crack" will refer to a through crack whose length is on the order of the specimen width.
equivalent stress intensities. In addition to the rapid average growth rates of small cracks, they also are subject to transient decelerations, and sometimes, virtual arrest. "Small" in this context generally means ~that the crack is of the same scale as some relevant microstructural element or local plastic zone, or is simply physically small, i.e., ~
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