Brodu Nicolas, Dijksman Joshua A, Behringer Robert P
INRIA, 200 Avenue de la Vieille Tour, 33405 Talence, France.
Department of Physics & Center for Nonlinear and Complex Systems, Duke University, P.O. Box 90305, Durham, North Carolina 27708-0305, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Mar;91(3):032201. doi: 10.1103/PhysRevE.91.032201. Epub 2015 Mar 2.
This article presents a new force model for performing quantitative simulations of dense granular materials. Interactions between multiple contacts (MC) on the same grain are explicitly taken into account. Our readily applicable MC-DEM method retains all the advantages of discrete-element method simulations and does not require the use of costly finite-element methods. The new model closely reproduces our recent experimental measurements, including contact force distributions in full 3D, at all compression levels of the packing up to the experimental maximum limit of 13%. Comparisons with classic simulations using the nondeformable spheres approach, as well as with alternative models for interactions between multiple contacts, are provided. The success of our model, compared to these alternatives, demonstrates that interactions between multiple contacts on each grain must be included for dense granular packings.
本文提出了一种用于对致密颗粒材料进行定量模拟的新力模型。明确考虑了同一颗粒上多个接触点（MC）之间的相互作用。我们易于应用的MC-DEM方法保留了离散元方法模拟的所有优点，并且不需要使用成本高昂的有限元方法。新模型能够紧密再现我们最近的实验测量结果，包括在堆积的所有压缩水平下直至13%的实验最大极限时的全三维接触力分布。还提供了与使用不可变形球体方法的经典模拟以及多个接触点之间相互作用的替代模型的比较。与这些替代模型相比，我们模型的成功表明，对于致密颗粒堆积，必须考虑每个颗粒上多个接触点之间的相互作用。
