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A. Mazzù¹, M. Faccoli¹, M. Lancini¹, C. Petrogalli¹, D. Nélias² and A. Ghidini³

¹Department of Mechanical and Industrial Engineering, University of Brescia, Italy
²Contact and Structures Mechanics Laboratory (LaMCoS), INSA-Lyon, Villeurbanne, France
³Lucchini RS S.p.A., Lovere, Italy

Keywords: wheel/rail materials, rolling contact fatigue, rolling/sliding contact, wear, ratcheting, inclusions, material characterization.

Summary

A procedure for wheels and rails material characterization is still an open task in railway industry. Common standardized procedures, both for calculations and experimental characterization of materials and components, are usually founded on empirical models, or on simple and controlled damage phenomena, such as wear, unidirectional or bidirectional strain. In this study, a procedure for characterizing wheel and rail materials, considering the complex interaction between different failure mechanisms that can occur at the loaded regions of wheels and rails, is proposed. Rolling contact tests were carried out by a bi-disk machine on couples of specimens of wheel and rail materials (ER8 EN13262 and UIC 900A, respectively), in various conditions of contact pressure and sliding ratio. In general, the main damage phenomenon was crack formation due to unidirectional plastic flow (ratcheting); a role of non-metallic inclusions (sulphides) as preferential crack nucleation site was observed; wear partially mitigated this phenomenon by removing layers of severely strained material from the surface. A calculation procedure for elaborating the experimental data is proposed: it allows considering the interaction of inclusions, ratcheting and wear, obtaining the characterization of materials for wheels and rails.

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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: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 179 A Procedure for Wheel and Rail Steels Characterization in Rolling Contact A. Mazzù¹, M. Faccoli¹, M. Lancini¹, C. Petrogalli¹, D. Nélias² and A. Ghidini³ ¹Department of Mechanical and Industrial Engineering, University of Brescia, Italy ²Contact and Structures Mechanics Laboratory (LaMCoS), INSA-Lyon, Villeurbanne, France ³Lucchini RS S.p.A., Lovere, Italy doi:10.4203/ccp.104.179 purchase the full-text of this paper Full Bibliographic Reference for this paper , "A Procedure for Wheel and Rail Steels Characterization in Rolling Contact", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 179, 2014. doi:10.4203/ccp.104.179 Keywords: wheel/rail materials, rolling contact fatigue, rolling/sliding contact, wear, ratcheting, inclusions, material characterization. Summary A procedure for wheels and rails material characterization is still an open task in railway industry. Common standardized procedures, both for calculations and experimental characterization of materials and components, are usually founded on empirical models, or on simple and controlled damage phenomena, such as wear, unidirectional or bidirectional strain. In this study, a procedure for characterizing wheel and rail materials, considering the complex interaction between different failure mechanisms that can occur at the loaded regions of wheels and rails, is proposed. Rolling contact tests were carried out by a bi-disk machine on couples of specimens of wheel and rail materials (ER8 EN13262 and UIC 900A, respectively), in various conditions of contact pressure and sliding ratio. In general, the main damage phenomenon was crack formation due to unidirectional plastic flow (ratcheting); a role of non-metallic inclusions (sulphides) as preferential crack nucleation site was observed; wear partially mitigated this phenomenon by removing layers of severely strained material from the surface. A calculation procedure for elaborating the experimental data is proposed: it allows considering the interaction of inclusions, ratcheting and wear, obtaining the characterization of materials for wheels and rails. purchase the full-text of this paper (price £20) 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 £65 +P&P)
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