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I. Deiros, C. Voivret, G. Combe, F. Emeriault, "Ballast Wear: Insight from the Discrete Element Simulation of Tracks and Micro-Deval Tests", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 20, 2016. doi:10.4203/ccp.110.20

Keywords: ballast grains, discrete element method, wear, micro-deval, multi-scale study, microscopic loading.

Summary

Throughout the life of a track, ballast grains wear as a result of both the trains passing over the track and the maintenance operations (tamping). The morphology of the grains is changed: they lose angularity and fine particles are produced, causing a gradual loss of track performance. Eventually ballast substitution becomes necessary. In order to predict the evolution of this degradation, a multi-scale study is proposed. A comparison between the discrete element method simulations of the micro-deval attrition test and of the passage of trains over a sleeper is performed in order to link the microscopic loading to the production of fine particles experimentally observed. The same numerical approach is also used with the simulations of the track to detect families of contacts in order to determine characteristic loading paths at the micro-scale. Loads and displacements of both systems are then compared in order to discuss the relevance of the micro-deval test.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 20 Ballast Wear: Insight from the Discrete Element Simulation of Tracks and Micro-Deval Tests I. Deiros^1,2, C. Voivret¹, G. Combe² and F. Emeriault² ¹Innovation & Research, SNCF, Paris, France ²3SR Laboratory, Grenoble Alpes University, France doi:10.4203/ccp.110.20 purchase the full-text of this paper Full Bibliographic Reference for this paper I. Deiros, C. Voivret, G. Combe, F. Emeriault, "Ballast Wear: Insight from the Discrete Element Simulation of Tracks and Micro-Deval Tests", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 20, 2016. doi:10.4203/ccp.110.20 Keywords: ballast grains, discrete element method, wear, micro-deval, multi-scale study, microscopic loading. Summary Throughout the life of a track, ballast grains wear as a result of both the trains passing over the track and the maintenance operations (tamping). The morphology of the grains is changed: they lose angularity and fine particles are produced, causing a gradual loss of track performance. Eventually ballast substitution becomes necessary. In order to predict the evolution of this degradation, a multi-scale study is proposed. A comparison between the discrete element method simulations of the micro-deval attrition test and of the passage of trains over a sleeper is performed in order to link the microscopic loading to the production of fine particles experimentally observed. The same numerical approach is also used with the simulations of the track to detect families of contacts in order to determine characteristic loading paths at the micro-scale. Loads and displacements of both systems are then compared in order to discuss the relevance of the micro-deval test. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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