The validation of some numerical predictions on squats growth

January 1, 2010 in

Conference Paper

Rolf Dollevoet

Zili Li, Maria Molodova, Xin Zhao


The 8th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2009)
Year: 2009
Location: Florence, Italy


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This paper presents the validation of some numerical predictions on squat growth by way of field monitoring, measurement and survey. The predictions concerns a postulated squat growth process, the relation between the dynamic contact force and the corrugation-like wave pattern that often follow squats, the high frequency wheel-rail interaction related to squat, and the influence of tangential force on squat growth. The validated results prove the feasibility for detection of early squats by identification of their signat ure tunes, show the necessity to include dynamic wheel-rail interaction in the analyses of squats, and provide evidence for the relation between squats imitation, growth and rolling stock performance. The validated numerical model can be employed for the identification of root causes for squat initiation, and for the determination of the loading conditions under which small defects may grow into squats, and under which crack may initiate and grow.