Abstract
This paper considers fatigue cracks after the stage of initiation and refers mainly to conditions under which continuous propagation does not occur. Examples of non-propagating cracks in notched round bars, plates and thin sheets are given; the role of such cracks in accounting for much of the difference between theoretical and experimental fatigue stress-concentration values is emphasized. The discontinuous nature of growth of slowly growing cracks is shown. The maximum length of non-propagating cracks varies with the material; mild steel gives longer ones than aluminium alloy L65, whereas so far they have not been found at all in copper (although very slow rates of growth are recorded). Attention is drawn to the way in which strain-ageing can influence the course of a fatigue crack. A satisfactory explanation of fatigue-crack growth must also account for the behaviour of non-propagating cracks.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
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