Abstract
The propagation behavior of short fatigue cracks formed at a notch root was studied by using low-carbon steel plates with center notches of various tip radii. The development of crack closure with crack growth was measured through the compliance method. Although the growth rate of short cracks was higher than that predicted from the rate-ΔK relation for long cracks, it was uniquely related to the effective stress intensity range and the relation was identical for long cracks. The increase in Kop with increasing crack length was independent of the notch root radius. The length of a non-propagating crack was affected by the notch root radius when it was a short, part-through crack. As the length of a non-propagating crack became longer, the threshold stress intensity range increased and the effective opening fraction decreased. The threshold value of the effective stress intensity range took a constant value irrespective of the crack length.
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