Abstract
Recent studies have evaluated mechanical contact phenomena through numerical simulations. Commonly, in the wheel-rail context for railway engineering applications, the wheel-rail contact and related phenomena have been addressed by the twin-disc test. It offers reliable information and insights for the study of phenomena such as wear and rolling contact fatigue—RCF. A numerical evaluation, in this context, may offer a complementary approach to understand these phenomena. In this context, stress and strain fields may be obtained and provide a basis for discussion and better interpretation of physical tests. The present work seeks to evaluate and understand the contact interaction in the twin-disc test with the aid of computational simulations using mainly the finite element method. The numerical reproduction of all inherent characteristics of the test is a challenging task. More specifically, the relative slip rate of the discs, a key kinematic parameter of the physical test, represents a crucial feature of the modelling process. There is specific software, such as CONTACT, where the inherent characteristics of the rolling contact are easily manipulated and can be used as a reference for the sake of comparison of results on the contact interface. The main contribution of the herein proposed approach is the reproduction of the so-called creep curves, while the stress–strain fields of the discs are fully assessed. The numerical results represent a conceptual base for better interpretation of the experiments. This leads to a discussion on predicting crack initiation candidate points and wear-prone regions, thus providing a numerical–theoretical source for explanation of some results observed in the literature.
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Acknowledgements
The authors acknowledge Vale S.A. for the support through Wheel-Rail Chair project. The second author acknowledges CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for the Grant 304680/2018-4.
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Nunhez, R.d., Gay Neto, A. Numerical investigation for creep curve evaluation on a twin-disc test scenario using finite elements. J Braz. Soc. Mech. Sci. Eng. 43, 339 (2021). https://doi.org/10.1007/s40430-021-03042-0
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DOI: https://doi.org/10.1007/s40430-021-03042-0