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Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/755

Title: Prediction of fatigue crack growth and residual life using an exponential model: Part II (mode-I overload induced retardation)
Authors: Mohanty, J R
Verma, B B
Ray, P K
Keywords: Crack driving forces
Exponential model
Fatigue crack growth retardation
Overload ratio
Variable amplitude loading
Issue Date: 2009
Publisher: Elsevier
Citation: International Journal of Fatigue, Vol 31, Iss 3, P 425-432
Abstract: Almost all load bearing components usually experience variable amplitude loading (VAL) rather than constant amplitude loading (CAL) during their service lives. A single overload cycle introduced in a constant amplitude fatigue loading retards fatigue crack growth and increases residual fatigue life. Although many models have been proposed on this subject, but life prediction under these complex situations is still under constant improvement. The present study aims at evaluating retardation in fatigue life due to application of a single tensile overload spike by adopting an exponential model. The proposed model calculates not only parameters related with overload induced retardation in fatigue crack growth, but also residual life in case of 7020-T7 and 2024-T3 aluminum alloys with reasonable accuracy without integration of rate equation. The model also covers stage-II and stage-III of post-overload period.
Description: Copyright for the paper belongs to Elsevier
URI: http://dx.doi.org/10.1016/j.ijfatigue.2008.07.018
http://hdl.handle.net/2080/755
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