• 主题
高级搜索  >
历史搜索 清空历史
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
【24h】

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分析沿着微弱的试验镇流器晶粒形态的演变：粗糙度尺度的关键作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

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：由于持续通过火车和定期维护操作所努力的努力，铁路轨道的镇流器谷物逐步穿着。晶粒的初始锋利边缘和顶点倾向于变得更光滑，并且表面纹理被移除。这种形态的这种变化在镇流器层的适当行为上起着关键作用，因此，在轨道上所需的频率维护上起作用。本文的目的是通过跟踪使用微偏差标准试验跟踪提交给加速老化的晶样片的形态来改善磨损过程的理解。为此目的，X射线计算断层扫描用于扫描不同磨损状态的晶粒样本，并使用3D图像分析进行比较所得到的图像。使用标量参数和球面谐波分析提供了不同尺度的形态演化的描述，证明了在标准的微缺口测试期间不会显着改变一般形式。因此，执行在粗糙度水平处的详细分析，示出了在镇流器磨损上的边缘扩展和顶点平滑现象的关键作用。

著录项

  • 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：铁路镇流器;X射线CT;晶粒形态;微弱点;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号