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The Method of Elastotonometry for Cornea Weakening in the Peripheral Annular Zone Read chapter Read first chapter

2020 | OriginalPaper | Chapter

6. Experimental and Theoretical Solution of the Problem on the Generating of Fatigue Wear in Heterogeneous Materials and Coatings

Authors : Oleg V. Kudryakov, Valery N. Varavka, Igor Yu. Zabiyaka, Natalia I. Bronnikova

Published in: Modeling, Synthesis and Fracture of Advanced Materials for Industrial and Medical Applications

Publisher: Springer International Publishing

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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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Metadata
Title
Experimental and Theoretical Solution of the Problem on the Generating of Fatigue Wear in Heterogeneous Materials and Coatings
Authors
Oleg V. Kudryakov
Valery N. Varavka
Igor Yu. Zabiyaka
Natalia I. Bronnikova
Copyright Year
2020
Book
Modeling, Synthesis and Fracture of Advanced Materials for Industrial and Medical Applications

Print ISBN: 978-3-030-48160-5

Electronic ISBN: 978-3-030-48161-2

Copyright Year: 2020

DOI
https://doi.org/10.1007/978-3-030-48161-2_6

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