DOI: https://doi.org/10.15802/stp2019/194472

DISCRETE ELEMENT MODELLING OF PARTICLE DEGARDATION OF RAILWAY BALLAST MATERIAL WITH PFC3D SOFTWARE

E. Juhasz, R. M. Movahedi, I. Fekete, S. Fischer

Abstract


Purpose. It is a very important issue to be able to determine the accurate particle degradation of railway ballast material. There are three different – but connecting – methodology for that: 1) full scale field tests, 2) full scale or reduced scale laboratory tests, 3) computer modelling, mainly with discrete element method (DEM). Options no. 1 and no. 2 need a lot of time and money, but for option no. 3 sophisticated software is needed that can consider the accurate micromechanical characteristics of ballast bed material. Methodology. In this paper the authors summarize their results related to modelling, having applied a software that uses DEM for calculation, as well as laboratory tests, namely uniaxial compression tests with reduced scale and computer tomography. Findings. The authors obtained the results that the uniaxial compression test in laboratory was able to be modelled by DEM software with an initial precision but in the future should be specified. The results are certified by measurements performed by computer tomography method. Originality. It is a very complicated issue to model the particle breakage of railway ballast not only particle movements in DEM software. There are many available software packages at the ‘market’, e.g. PFC, EDEM, YADE. Some of them are quite expensive, the others can be controlled by significantly difficult manner (special programming technique is needed, command line, etc.) The authors applied not only laboratory loading tests, but sophisticated computer tomography for their research. Practical value The results can be useful for railway engineering area. This article is a part of a PhD research at Szechenyi Istvan University, the PhD student is Erika Juhász. Her aim is to develop a method to be able to determine the more accurate ballast breakage, as well as develop assessment methodology related to special measurement techniques (e.g. GOM techniques, computer tomography, etc.). The publishing of this paper was supported by ÚNKP–19-3–I–SZE–13 project.


Keywords


discrete element modelling; particle degradation; breakage; laboratory test; static pressing test; CT-equipment

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References


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Gálos, M., & Orosz, Á. (2019). Ágyazati kőanyagok viselkedésének vizsgálata ismételt terhelés hatására. Sínek Világa, 65(1), 10-15. (in Hungarian)

GOM Metrology Systems. Retrieved from: https://www.gom.com/metrology-systems.html. (in English)

Juhász, E., & Fischer, Sz. (2019). A vasúti ágyazati szemcsék degradációjának mérése laboratóriumi körülmények között. Sínek Világa, 65(5), 2-12. (in Hungarian)

Juhász, E., Movahedi, R. M., Fischer, Sz. (2019). A vasúti zúzottkő ágyazati kőanyagok aprózódásának diszkrét elemes modellezése. Sínek Világa, 65(6), 2-10. (in Hungarian)

Juhász, E., & Fischer, Sz. (2019). Individual laboratory test method for railroad ballast particle breakage, Conference on Transport Sciences. Győr. Retrieved from https://u.to/H49pFQ (in English)

Juhász, E., & Fischer, Sz. (2019). Investigation of railroad ballast particle breakage. Pollack Periodica, 14(2), 3-14. doi: 10.1556/606.2019.14.2.1 (in English)

Juhász, E., & Fischer, Sz. (2018). Investigation of railway ballast materials’ particle degradation with special laboratory test method, 14th Miklós Iványi PhD & DLA Symposium. Pécs. Retrieved from https://clck.ru/G4KnU (in English)

Juhász, E., & Fischer, Sz. (2019). Railroad Ballast Particle Breakage with Unique Laboratory Test Method. Acta Technica Jaurinensis, 12(1), 26-54. doi: 10.14513/actatechjaur.v12.n1.489 (in English)

Juhász, E., & Fischer, Sz. (2019). Specific Evaluation Methodology of Railway Ballast Particles’ Degradation. Science and Transport Progress, 3(81), 96-109. doi: 10.15802/stp2019/171778 (in English)

Kozma, I., Fekete, I., Zsoldos, I. (2017). Failure Analysis of Aluminum – Ceramic Composites. Materials Science Forum, 885, 286-291. doi: 10.4028/www.scientific.net/MSF.885.286 (in English)

Kurhan, D. M. (2016). Determination of Load for Quasi-static Calculations of Railway Track Stress-strain State. Acta Technica Jaurinensis, 9(1), 83-96. doi: 10.14513/actatechjaur.v9.n1.400 (in English)

Sysyn, M., Kovalchuk, V., Gerber, U., Nabochenko, O., & Parneta, B. (2019). Laboratory evaluation of railway ballast consolidation by the non-destructive testing. Communications, 21(2), 81-88. (in English)

New Contact Models in PFC. Retrieved from: https://www.itascacg.com/software/new-contact-models-in-pfc (in English)

PFC Contact Models. Retrived from: https://www.itascacg.com/software/pfc-contact-models (in English)

Gerber, U., Sysyn, M., Zarour, J., & Nabochencko, O. (2019). Stiffness and strength of structural layers from cohesionless material. Archives of Transport, 49(1), 59-68. doi: 10.5604/01.3001.0013.2776 (in English)


GOST Style Citations


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