3-D Image-based Discrete Element Modeling for Irregularly-Shaped Grains
3-D Image-based Discrete Element Modeling for Irregularly-Shaped Grains
复制标题
基于 3D 图像的不规则形状颗粒离散元建模
DOI：
10.1201/b17007-61
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
T. Matsushima
中科院分区：
文献类型：
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作者：
T. Matsushima
在各种工程领域中使用的颗粒通常具有非常不规则的形状，并且这种颗粒形状极大地影响其组装的力学行为。为了定量地模拟这种粒状材料的剪切行为，已经提出了基于图像的离散元建模（Matsushima和Saomoto 2002）。本文重点研究了三维模型的建立及其有效性检验。模型材料是丰浦砂（日本的标准砂），其三维颗粒形状数据是在SPring-8用微型X射线CT获得的（Matsushima等，2004 a）。将它们直接转化为离散元模型，并以两个误差指标讨论了模型的精度。然后制备了不同孔隙比的“虚拟”试件，进行了定围压和定体积条件下的单剪试验。计算结果与实验数据基本吻合，证明了本文提出的晶粒形状模型的有效性。
Grains used in various engineering fields often have very irregular shape, and this grain shape greatly affects the mechanical behavior of their assembly. In order to simulate shear behavior of such granular materials quantitatively an image-based Discrete Element modeling has been proposed (Matsushima and Saomoto 2002). This paper focuses on the 3-D version of the modeling and its effectivity check. The material modeled is Toyoura sand (a standard sand in Japan) whose 3-D grain shape data were obtained with a micro X-ray CT at SPring-8 (Matsushima et al. 2004a). They are directly converted into Discrete Element models, and the accuracy of the model is discussed with two error indices. Then various "virtual" specimens with dif- ferent void ratios are prepared and a series of simple shear tests are performed under (1) constant confining pressure and (2) constant volume. The results are basically in good agreement with experimental data, which proves the effectivity of the present grain shape modeling.