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arXiv 1607.01415cond-mat.soft
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任意形状颗粒材料的断裂:一种新的内聚相互作用模型

Fracture of granular materials composed of arbitrary grain shapes: A new cohesive interaction model

A Neveu, R Artoni, P Richard, Y Descantes

摘要:

离散元方法(DEM)是模拟粘性颗粒材料断裂的有用工具。对于这种应用,通常采用简单的颗粒形状(2D中的圆盘,3D中的球体)。然而,处理更一般的颗粒形状允许考虑真实材料中颗粒的自然异质性。我们提出了一个离散的模型,允许模仿接触或非接触颗粒之间的凝聚力,无论它们在2D和3D中的形状。内聚相互作用由放置在相互作用颗粒上的内聚点组成,目的是表示位于颗粒之间的内聚相。接触的情况下,解决根据单边接触和库仑摩擦定律。为了测试所开发的模型,2D单轴压缩模拟进行。数值结果表明,该模型能够模拟宏观行为的骨料颗粒受到轴向压缩,以及断裂的启动和传播。模型和样本参数的影响的研究提供了重要的信息的模型再现各种行为的能力。

英文摘要:

Discrete Element Methods (DEM) are a useful tool to model the fracture of cohesive granular materials. For this kind of application, simple particle shapes (discs in 2D, spheres in 3D) are usually employed. However, dealing with more general particle shapes allows to account for the natural heterogeneity of grains inside real materials. We present a discrete model allowing to mimic cohesion between contacting or non-contacting particles whatever their shape in 2D and 3D. The cohesive interactions are made of cohesion points placed on interacting particles, with the aim of representing a cohesive phase lying between the grains. Contact situations are solved according to unilateral contact and Coulomb friction laws. In order to test the developed model, 2D unixial compression simulations are performed. Numerical results show the ability of the model to mimic the macroscopic behavior of an aggregate grain subject to axial compression, as well as fracture initiation and propagation. A study of the influence of model and sample parameters provides important information on the ability of the model to reproduce various behaviors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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