Analysis of rail cooling strategies through numerical simulation with instant calculation of thermal expansion coefficient

  1. A. Pernía-Espinoza 1
  2. F.J. Martínez-de-Pisón 2
  3. E. Martínez-de-Pisón 2
  4. J. Blanco 2
  1. 1 EDMANS Group (http://www.mineriadatos.com), Department of Mechanical Engineering, Universidad de La Rioja, Spain
  2. 2 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Revista de metalurgia

ISSN: 0034-8570

Año de publicación: 2010

Volumen: 46

Número: 4

Páginas: 308-319

Tipo: Artículo

DOI: 10.3989/REVMETALM.0911 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Revista de metalurgia

Resumen

This article describes a new methodology to simulate the cooling process for an asymmetrical Ri60 grooved rail, designed for city tramways, in a more realistic manner than that conducted previously by other authors for long steel sections. The approach considers the phase transformation of the steel and the forced convection cooling. The process is modelled as an uncoupled thermo-mechanical problem. First, the rail’s temperature history is obtained from a computer fluid dynamic model and subsequently introduced in the finite element model, in order to model the stresses and displacements. This second stage involves the calculation of the thermal expansion coefficient, for each element and at each iteration. The calculation is made according to the continuous cooling transformation diagram. These results lead to the extremely reliable determination of residual stresses as proved by the comparison with experimental data obtained in the industrial plant. The methodology allows for an accurate study of two types of cooling strategies for the Ri60 and the selection of the more suitable one.

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