Influence of particle shape and angularity on the behaviour of granular materials: a numerical analysis
Influence of particle shape and angularity on the behaviour of granular materials: a numerical analysis
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DOI：
10.1002/nag.314
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发表时间：
2003-12-10
影响因子：
4
通讯作者：
Vincens, E
中科院分区：
文献类型：
--
作者：
Nouguier-Lehon, C;Cambou, B;Vincens, E
本文用离散元法（接触动力学）从二维分析中分析了颗粒形状和棱角性对颗粒材料性能的影响。不同形状的颗粒进行了研究（圆形，各向同性的多边形和细长的多边形形状），以及不同的初始状态（密度）和加载方向相对于初始织物。双轴试验的模拟清楚地表明，具有各向同性颗粒的样品的行为可以从具有各向异性颗粒的样品中分离出来。事实上，对于各向同性颗粒，棱角性往往会加强样品的行为，并减缓局部或全局现象。其中一个主要结果涉及的各向同性颗粒的特征在于在临界状态下的摩擦角，临界孔隙比和临界各向异性的临界状态的存在。这种临界状态似乎是无意义的细长晶粒和行为的样品产生这样的颗粒是高度依赖于加载相对于初始织物的方向。与组构和颗粒取向相关的局部变量的研究提供了更多的信息。特别是，一致的主轴组构张量与应力张量是突然的各向同性颗粒。相反，对于细长颗粒，该过程逐渐开始。版权所有（C）2003约翰威利父子有限公司。
This paper analyses the influence of grain shape and angularity on the behaviour of granular materials from a two-dimensional analysis by means of a discrete element method (Contact Dynamics). Different shapes of grains have been studied (circular, isotropic polygonal and elongated polygonal shapes) as well as different initial states (density) and directions of loading with respect to the-initial fabric. Simulations of biaxial tests clearly show that the behaviour of samples with isotropic particles can be dissociated from that of samples with anisotropic particles. Indeed, for isotropic particles, angularity just tends to strengthen the behaviour of samples and slow down either local or global phenomena. One of the main results concerns the existence of a critical state for isotropic grains characterized by an angle of friction at the critical state, a critical void ratio and also a critical anisotropy. This critical state seems meaningless for elongated grains and the behaviour of samples generated with such particles is highly dependent on the direction of loading with respect to the initial fabric. The study of local variables related to fabric and particle orientation gives more information. In particular, the coincidence of the principal axes of the fabric tensor with those of the stress tensor is sudden for isotropic particles. On the contrary, this process is gradually initiated for elongated particles. Copyright (C) 2003 John Wiley Sons, Ltd.