Micro-mechanical investigation of railway ballast behavior under cyclic loading in a box test using DEM: effects of elastic layers and ballast types [0.03%]
基于DEM箱梁模型的道砟循环荷载微细观力学行为研究：弹性层及道砟类型的影响分析
Nishant Kumar,Bettina Suhr,Stefan Marschnig et al.
Nishant Kumar et al.
Abstract: Ballasted tracks are the commonly used railway track systems with constant demands for reducing maintenance cost and improved performance. Elastic layers are increasingly used for improving ballasted tracks. In ...
Huiqi Li,Glenn R McDowell
Huiqi Li
It has recently been reported that under sleeper pads (USPs) could improve ballasted rail track by decreasing the sleeper settlement and reducing particle breakage. In order to find out what happens at the particle-pad interface, discrete e...
Edward Andò,Jelke Dijkstra,Emmanuel Roubin et al.
Edward Andò et al.
This paper presents the results of an experimental study of the particle scale mechanisms that underpin creep, on-going deformations under constant external load, in dry non-cemented sand under 1D oedometric compression loading at 2500 kPa....
Comparison of two different types of railway ballast in compression and direct shear tests: experimental results and DEM model validation [0.03%]
两种铁路道砟的压缩和直接剪切试验对比：试验结果及离散元模型验证
Bettina Suhr,Stefan Marschnig,Klaus Six
Bettina Suhr
Railway ballast is an angular and coarse material, which demands careful DEM modelling and validation. Particle shape is often modelled in high accuracy, thus leading to computational expensive DEM models. Whether this effort will increase ...
Parametrisation of a DEM model for railway ballast under different load cases [0.03%]
考虑不同工况的铁路道砟DEM模型参数化研究
Bettina Suhr,Klaus Six
Bettina Suhr
The prediction quality of discrete element method (DEM) models for railway ballast can be expected to depend on three points: the geometry representation of the single particles, the used contact models and the parametrisation using princip...
A Leonard,C Chong,P G Kevrekidis et al.
A Leonard et al.
This study describes the dynamic response of a two-dimensional hexagonal packing of uncompressed stainless steel spheres excited by localized impulsive loadings. The dynamics of the system are modeled using the Hertzian normal contact law. ...