Topic
Crack closure
About: Crack closure is a research topic. Over the lifetime, 28157 publications have been published within this topic receiving 588158 citations.
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TL;DR: In this article, it was shown that crack closure occurs only when the stress intensity conditions were reduced to below the minimum stress intensity level (KM I N) for the previous fatigue cycles.
125 citations
TL;DR: In this paper, the thermal effects associated with the propagation of a fatigue crack in a gigacycle fatigue regime were studied. But the authors focused on the time evolution of the temperature fields in specimens and showed a good correlation with experiment and provided experimental proof that the propagation stage constitutes a small part of the lifetime of the specimen.
125 citations
TL;DR: In this article, an experimental study of the fretting crack nucleation threshold, expressed in terms of loading conditions, with a cylinder/plane contact was carried out with a damage tolerant aluminium alloy widely used in the aerospace application.
125 citations
TL;DR: In this article, a qualitative model was developed in terms of a two-step process, precursor faulting followed by crack growth to pop-in instability, and it was concluded that it is the shear across the fault and not the tension across the crack which was vital in driving the initiation.
Abstract: The initiation of radial cracks in Vickers indentation of soda-lime glass is found to be strongly rate dependent. For long contact durations the radial cracks pop in during the indentation event, at a reproducible stage of the unloading half-cycle; for short contacts the pop-in occurs after the event, with considerable scatter in delay time. The phenomenon is interpreted in terms of an incubation time to develop a critical nucleus for the ensuing fracture. Increasing either the water content of the environment or the peak contact load diminishes the incubation time. Scanning electron microscopy of the indentation patterns indicates that the sources of the crack nuclei are constrained shear faults within the deformation zone. A qualitative model is developed in terms of a two-step process, precursor faulting followed by crack growth to pop-in instability. Moisture may influence both these steps, in the first by interfacial decohesion and in the second by slow crack growth. No definitive conclusion is reached as to which of the steps is ratecontrolling, although it appears that it is the shear across the fault and not the tension across the crack which is vital in driving the initiation. The implications of these results in connection with the basic mechanical properties of brittle solids, particularly strength, are considered.
124 citations
01 Jan 1986
124 citations