Experimentální a numerický přístup v kontaktní únavě železničních kol

Abstract

The dissertation focuses on an experimental and numerical approach in the field of contact fatigue of railway wheels. The presented work is divided into three parts. The first part contains an introduction to the issue, which is focused on the presentation of machines for rolling contact fatigue research, the introduction of the acoustic emission method, the method of digital image correlation, optical profilometry, the presentation of the basics of the theory of cyclic plasticity and, last but not least, the presentation of the objectives of the dissertation. The second part is dedicated to the experimental and numerical study within the framework of the problem. In the experimental field, the author deals with the presentation and subsequent evaluation of the results of optical profilometry, respectively the acoustic emission method. The results of the numerical study, on the other hand, are focused on the evaluation of the used calculation strategy and the selected models of cyclic plasticity. The third, final part is devoted to the overall evaluation of the submitted dissertation, including a discussion of its contribution and the proposal of options for continuing research in this area.