A parametric study on the fatigue life of turnout crossings using the finite element approach.

April 5, 2016 in

Conference Paper


Author
Lizuo Xin

Co-authors
Valeri Markine

Theme(s)


Conference
The 3rd international conference on railway technology
Year: April 2016
Location: Cagliary, Italy

Keywords
dynamics, explicit finite element modeling, fatigue analysis, Turnout crossing, wheel–rail contact

Link or Download
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Abstract

Railway turnouts (switches and crossings) are important elements in the railway infrastructure that provide flexibility of the system and guide the railway traffic. However, due to the high impact forces, severe damage to the turnout crossing can frequently be observed. In this paper parametric studies are performed to investigate the effects of different railpads, friction coefficients and traveling directions on the dynamic behaviour of the turnout crossing. First, the dynamic behaviour is analysed using the explicit finite element method accounting for non-linear material properties (plasticity) of rails. From the numerical simulations the dynamic responses such as contact forces, stress and strain distributions in rails, sleepers and ballast are obtained. After that on the basis of the obtained responses rail fatigue analysis is performed. A critical plane and energy density based fatigue analysis approach is used to assess the crossing performance under various conditions of the parametric studies. The performance is estimated by the predicted fatigue life to crack initiation in the crossing rail. The results of these parametric studies are presented and discussed.