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Title: A study on spot heating induced fatigue crack growth retardation
Authors: Ray, P K
Ray, P K
Verma, B B
Keywords: Fatigue crack growth retardation
Plastic zone size
Spot heating
Wheeler model
Issue Date: 2005
Publisher: Blackwell Synergy
Citation: Fatigue & Fracture of Engineering Materials and Structures, Vol 28, Iss 7, P 579-585
Abstract: The 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.
Description: Copyright for this article belongs to Blackwell Synergy DOI: 10.1111/j.1460-2695.2005.00901.x
Appears in Collections:Journal Articles

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