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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
Edited by: J. Pombo
Paper 109

Angles and Location of a RCF Crack in Heavy Haul Railways based on the Critical Plane

S. Wang, Y. Zhou, Y. Xu and H. Li

Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai, China

Full Bibliographic Reference for this paper
S. Wang, Y. Zhou, Y. Xu, H. Li, "Angles and Location of a RCF Crack in Heavy Haul Railways based on the Critical Plane", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 109, 2014. doi:10.4203/ccp.104.109
Keywords: critical plane, fatigue parameter, wheel rail creep, RCF crack initiation, stress-strain response.

Multi-body dynamics and three-dimensional elastic bodies Non-Hertz rolling contact theory are used to obtain wheel-rail adhesion-slip motion states in different kinds of tracks, which include different rail cant, superelevation, COF (coefficients of friction) and radius. The parameters of contact patch in leading wheel and trailing wheel are then analysed separately. Pressure and tangential force distribution were loaded to the contact patch of rail finite element model. Then the fatigue parameters of all nodes in the railhead are obtained by stress/strain response analysis. The plane which has the maximum value of fatigue parameter is the initiation plane RCF crack. The location and angles of crack can be obtained. The critical plane takes an orientation; a certain degree with respect to the lateral and longitudinal direction of the rail. For outer rail, when COF is larger than 0.3, RCF crack was initiated on the surface of railhead; when COF becomes smaller than 0.3, the location of RCF crack initiation transfers to the inside rail head gradually. For inner rail, the location of RCF crack initiation is beneath the rail surface of 2-3 mm in most tracks.

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