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D.R. Welsby¹, C.L. Pun², P.J. Mutton¹ and W. Yan²

¹Institute of Railway Technology, Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria, Australia
²Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria, Australia

doi:10.4203/ccp.104.111

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D.R. Welsby, C.L. Pun, P.J. Mutton, W. Yan, "Rail Performance and Management of Rolling Contact Fatigue under Heavy Axle Load Conditions", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 111, 2014. doi:10.4203/ccp.104.111

Keywords: rolling contact fatigue, rail, wear, ratcheting.

Summary

This paper provides an overview of the maintenance challenges facing rail operators selecting the most suitable premium rail steel grades for use under high axle load conditions such as those present in the Pilbara region of Australia. The results of inservice trials which have included a range of eutectoid and hypereutectoid, heat treated grades has shown that the "harder is better" maxim is not necessarily the best approach under high traction conditions, whereas the use of these grades under more moderate, low traction conditions can allow rail grinding cycles to be extended. Laboratory testing of three of these grades, of nominally identical hardness but differing in composition (in particular in carbon levels), has been undertaken to examine the ratcheting behaviour under bi-axial compression-torsion cyclic loading conditions. From the four multi-axial stress loading paths studied, the elliptical loading path, which is more relevant to wheel/rail contact situations, gives the lowest ratcheting strain and the lowest ratcheting strain rate. Out of the three steels examined, the low alloy heat-treated rail steel grade has the best resistance to ratcheting.

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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 111 Rail Performance and Management of Rolling Contact Fatigue under Heavy Axle Load Conditions D.R. Welsby¹, C.L. Pun², P.J. Mutton¹ and W. Yan² ¹Institute of Railway Technology, Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria, Australia ²Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria, Australia doi:10.4203/ccp.104.111 purchase the full-text of this paper Full Bibliographic Reference for this paper D.R. Welsby, C.L. Pun, P.J. Mutton, W. Yan, "Rail Performance and Management of Rolling Contact Fatigue under Heavy Axle Load Conditions", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 111, 2014. doi:10.4203/ccp.104.111 Keywords: rolling contact fatigue, rail, wear, ratcheting. Summary This paper provides an overview of the maintenance challenges facing rail operators selecting the most suitable premium rail steel grades for use under high axle load conditions such as those present in the Pilbara region of Australia. The results of inservice trials which have included a range of eutectoid and hypereutectoid, heat treated grades has shown that the "harder is better" maxim is not necessarily the best approach under high traction conditions, whereas the use of these grades under more moderate, low traction conditions can allow rail grinding cycles to be extended. Laboratory testing of three of these grades, of nominally identical hardness but differing in composition (in particular in carbon levels), has been undertaken to examine the ratcheting behaviour under bi-axial compression-torsion cyclic loading conditions. From the four multi-axial stress loading paths studied, the elliptical loading path, which is more relevant to wheel/rail contact situations, gives the lowest ratcheting strain and the lowest ratcheting strain rate. Out of the three steels examined, the low alloy heat-treated rail steel grade has the best resistance to ratcheting. 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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