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Numerical and analytical modeling of particle degredation

Conference Paper


Abstract


  • Large cyclic loads are nowinevitable due to an increased demand for freight and public transport.

    The ballast layer subjected to these repeated traffic loads in a real track environment undergoes excessive

    deformation and degradation. Ballast degradation is influenced by various factors including the amplitude and

    number of load cycles, confining pressure, frequency, the angularity as well as fracture strength of individual

    grains. Given the complexities of the behaviour of the rail track, the current track analysis techniques are overly

    simplified. Considering this, an elasto-plastic constitutive model of a composite track is proposed. The largescale

    laboratory tests are simulated in a numerical model and the results are then analyzed to better understand

    the distribution of displacements and stresses inside the ballast layer. The advantages of the elasto-plastic finite

    element simulations when compared to conventional analytical methods used by practitioners that are primarily

    based on a linear elastic approach are demonstrated.

Publication Date


  • 2015

Citation


  • Nimbalkar, S. & Indraratna, B. (2015). Numerical and analytical modeling of particle degredation. Computer Methods and Recent Advances in Geomechanics (pp. 261-266). United Kingdom: Taylor & Francis.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2928

Start Page


  • 261

End Page


  • 266

Place Of Publication


  • United Kingdom

Abstract


  • Large cyclic loads are nowinevitable due to an increased demand for freight and public transport.

    The ballast layer subjected to these repeated traffic loads in a real track environment undergoes excessive

    deformation and degradation. Ballast degradation is influenced by various factors including the amplitude and

    number of load cycles, confining pressure, frequency, the angularity as well as fracture strength of individual

    grains. Given the complexities of the behaviour of the rail track, the current track analysis techniques are overly

    simplified. Considering this, an elasto-plastic constitutive model of a composite track is proposed. The largescale

    laboratory tests are simulated in a numerical model and the results are then analyzed to better understand

    the distribution of displacements and stresses inside the ballast layer. The advantages of the elasto-plastic finite

    element simulations when compared to conventional analytical methods used by practitioners that are primarily

    based on a linear elastic approach are demonstrated.

Publication Date


  • 2015

Citation


  • Nimbalkar, S. & Indraratna, B. (2015). Numerical and analytical modeling of particle degredation. Computer Methods and Recent Advances in Geomechanics (pp. 261-266). United Kingdom: Taylor & Francis.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2928

Start Page


  • 261

End Page


  • 266

Place Of Publication


  • United Kingdom