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Contact dynamics simulations of compacting cohesive granular systems

机译:压实粘性颗粒系统的接触动力学模拟

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The modelling of cohesion on the particle scale in granular matter [Vermeer et al., 2001] [1] has recently received increasing attention, because various important applications call for a microscopic foundation for the existing phenomenological continuum theories. Specifically for understanding the different behaviour of nano-powders and ordinary granular matter cohesion has to be taken into account. An example in this context is the so-called sinter-forging of nano-powders, i.e. pressure sintering at relatively low temperatures [Skandan et al., 1994] [2]. We model the corresponding compaction by the rearrangement of a large number of grains by means of contact-dynamics. For this purpose we introduce an attractive force (cohesion) as well as rolling friction between the (round) grains. The latter turns out to be crucial for the stabilization of force chains.
机译:颗粒状颗粒尺度内聚力的建模[Vermeer et al。,2001] [1]最近受到越来越多的关注,因为各种重要的应用都要求为现有的现象学连续论提供微观基础。特别是为了理解纳米粉末的不同行为和普通颗粒物质的内聚力,必须加以考虑。在这种情况下的一个例子是所谓的纳米粉末的烧结锻造,即在相对较低的温度下进行压力烧结[Skandan等,1994] [2]。我们通过接触动力学将大量晶粒重新排列来模拟相应的压实。为此,我们引入了吸引力(内聚力)以及(圆形)晶粒之间的滚动摩擦。事实证明,后者对于稳定部队链至关重要。

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