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首页> 外文期刊>Granular matter >X-ray CT analysis of the evolution of ballast grain morphology along a Micro-Deval test: key role of the asperity scale
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X-ray CT analysis of the evolution of ballast grain morphology along a Micro-Deval test: key role of the asperity scale

机译：X射线CT分析微定距测试中压载晶粒形态的演变：粗糙尺度的关键作用

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摘要

Ballast grains in railway tracks progressively wear due to the efforts exerted by the continuous passage of trains and the periodic maintenance operations. The initial sharp edges and vertices of the grains tend to become smoother and the surface texture is removed. This change in morphology plays a key role on the proper behaviour of the ballast layer and, consequently, on the frequency maintenance required on the track. The object of this paper is to improve the understanding of the wear process by tracking the morphology of a sample of grains submitted to an accelerated ageing using the Micro-Deval standard test. To this goal, X-ray Computed Tomography is used to scan a sample of grains at different states of wear and the resulting images are compared using 3D image analysis. A description of morphology evolution at different scales is provided using scalar parameters and spherical harmonic analysis, proving that the general form is not significantly changed during a standard Micro-Deval test. Thus a detailed analysis at the asperity level is performed, showing the key role of the edge broadening and vertex smoothing phenomena on ballast wear.
机译：由于火车的连续通过和定期维护操作所付出的努力，铁路轨道中的压载谷物逐渐磨损。晶粒的初始尖锐边缘和顶点趋于变得更平滑，并且表面纹理被去除。形态上的这种变化对于压载层的适当性能以及因此在轨道上要求的频率保持起着关键作用。本文的目的是通过使用Micro-Deval标准测试跟踪经过加速老化的晶粒样品的形态来增进对磨损过程的了解。为了达到这个目标，使用X射线计算机断层扫描技术对处于不同磨损状态的谷物样品进行扫描，并使用3D图像分析对所得图像进行比较。使用标量参数和球谐分析提供了不同尺度下形态演化的描述，证明了一般形式在标准Micro-Deval测试期间没有明显改变。因此，在粗糙程度上进行了详细的分析，显示出边缘加宽和顶点平滑现象对压载物磨损的关键作用。

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  • 来源
    《Granular matter》 |2019年第2期|30.1-30.12|共12页
  • 作者

    Quintanilla Ivan Deiros; Combe Gael; Emeriault Fabrice; Voivret Charles; Ferellec Jean-Francois;

  • 作者单位

    Univ Grenoble Alpes, 3SR, F-38000 Grenoble, France|CNRS, 3SR, F-38000 Grenoble, France;

    Univ Grenoble Alpes, 3SR, F-38000 Grenoble, France|CNRS, 3SR, F-38000 Grenoble, France;

    Univ Grenoble Alpes, 3SR, F-38000 Grenoble, France|CNRS, 3SR, F-38000 Grenoble, France;

    SNCF Reseau, Direct Ingn & Projets, F-93574 La Plaine St Denis, France;

    SNCF Reseau, Direct Ingn & Projets, F-93574 La Plaine St Denis, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Railway ballast; X-ray CT; Grain morphology; Micro-Deval;

    机译：铁路道ast;X射线CT;粒形;微化;

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