论文标题
摩擦振动的颗粒流量
Frictional weakening of vibrated granular flows
论文作者
论文摘要
我们在计算上研究了在边界上应用谐波振动的剪切颗粒培养基的摩擦特性。人们认为，这种振动在削弱流动中起着重要作用，但是幅度，频率和压力对过程的独立影响仍不清楚。基于维度分析和DEM模拟，我们表明，除了先前提出的峰值加速度标准外，导致接触的破坏还需要弱化的位移的绝对振幅平方相对于限制压力，还足够大。该分析为预测受任意外部振动的流量提供了一个基础，并证明了先前未识别的第二个过程取决于耗散，这有助于剪切在振动下剪切削弱。
We computationally study the frictional properties of sheared granular media subjected to harmonic vibration applied at the boundary. Such vibrations are thought to play an important role in weakening flows, yet the independent effects of amplitude, frequency, and pressure on the process have remained unclear. Based on a dimensional analysis and DEM simulations, we show that, in addition to a previously proposed criterion for peak acceleration that leads to breaking of contacts, weakening requires the absolute amplitude squared of the displacement is sufficiently large relative to the confining pressure. The analysis provides a basis for predicting flows subjected to arbitrary external vibration and demonstrates that a previously unrecognized second process that is dependent on dissipation contributes to shear weakening under vibrations.
