Propagation Of A Fatigue Crack Through A Protective Layer.
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L. Nahlik, Z. Knesl & J. Vrbka
Propagation of a fatigue crack through a protective layer L.Nahlik Z.Knesl^ & J. "Institute of Solid Mechanics, Faculty of Mechanical Engineering, Brno University of Technology, Czech Republic Abstract The contribution describes a study of the beliavior of a fatigue crack growing in a protective layer and penetrating through the interface and into the substrate. The study aims especially to quantify the influence of the interface on the rate and threshold value of a fatigue crack propagating perpendicularly to the interface. Special attention is devoted to the case of a crack touching the interface. It is shown that the fatigue crack propagation rate and the corresponding threshold value are strongly influenced by the existence of an interface between two materials. A tentative procedure suggested in the paper makes it possible to quantify the effect and determine the dependence of a rate of propagation of a fatigue crack growing through the interface on the bi-material