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Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/203

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contributor.authorRay, P K-
contributor.authorRay, P K-
contributor.authorVerma, B B-
identifier.citationFatigue & Fracture of Engineering Materials and Structures, Vol 28, Iss 7, P 579-585en
descriptionCopyright for this article belongs to Blackwell Synergy DOI: 10.1111/j.1460-2695.2005.00901.xen
description.abstractThe propagation of a growing fatigue crack can be effectively retarded heating a spot near the crack tip (under zero stress condition). Spot heating to a subcritical temperature and at a precise location modifies the crack growth behaviour in a way, more or less, similar to specimens subjected to an overload spike. It is observed that the magnitude of spot heating induced crack growth retardation increases with increase in spot temperature. It is also observed that the crack growth behaviour is influenced by the position of the heating spot and there exists an optimum position of hot spot that produces maximum retardation in fatigue crack growth rate. The plastic zone length due to spot heating has been estimated using experimental data. It is found that the plastic zone length due to spot heating increases exponentially with increase in spot temperature. The Wheeler model for crack growth retardation has been modified by introducing a plastic zone correction factor λ. The values of λ and the shaping exponent, m, in the Wheeler model have been obtained for different spot heating temperatures.en
format.extent1088061 bytes-
publisherBlackwell Synergyen
subjectFatigue crack growth retardationen
subjectPlastic zone sizeen
subjectSpot heatingen
subjectWheeler modelen
titleA study on spot heating induced fatigue crack growth retardationen
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