Abstract
The process of nucleation of fatigue wear in industrial alloys and ion-plasma coatings under the influence of high-speed discrete droplet flow is investigated. The results obtained relate to the stage of microstructural mechanics of fatigue fracture. This stage precedes the stage of the steady growth of fatigue cracks, which is described by the continuum mechanics of fatigue failure (for example, by the Paris–Erdogan concept). Processes of formation of fatigue defects in materials and coatings with a heterogeneous structure are considered on the base of the dislocations theory. A computational–analytical model for determining the moment of formation of a defect (cracks, pores, microcrater) of critical size depending on the parameters of droplet impacts is proposed and theoretically substantiated. The model is universal in its application to various materials and coatings, in which the mechanisms for the nucleation of defects are of a dislocation nature. The correspondence of the results of numerical experiments in the framework of the developed model to the results of bench tests is shown. The data testifying to the high compliance of the results of the application of the proposed model and the well-known fatigue model of Murakami–Endo for steels and alloys in conditions of droplet impacts are given. At the same time, the results obtained using both models for thin high-strength ion-plasma coatings contradict each other.
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The work was carried out with financial support from Russian Foundation for Basic Research (project code 18-08-00546).
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Kudryakov, O.V., Varavka, V.N., Zabiyaka, I.Y., Bronnikova, N.I. (2020). Experimental and Theoretical Solution of the Problem on the Generating of Fatigue Wear in Heterogeneous Materials and Coatings. In: Aizikovich, S., Altenbach, H., Eremeyev, V., Swain, M., Galybin, A. (eds) Modeling, Synthesis and Fracture of Advanced Materials for Industrial and Medical Applications. Advanced Structured Materials, vol 136. Springer, Cham. https://doi.org/10.1007/978-3-030-48161-2_6
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