论文标题
颗粒包装，带滑动，滚动和扭曲的摩擦
Granular packings with sliding, rolling and twisting friction
论文作者
论文摘要
直觉告诉我们，由于存在摩擦和其他耗散性相互作用，滚动或旋转球最终将停止。阻止球体的滚动和旋转/扭转扭矩的阻力也通过增加运动自由度上的约束数量来改变摩擦球的颗粒堆积的微观结构。我们执行离散的元素建模模拟，以构建在压力控制协议下实现一系列摩擦约束的球形包装。当颗粒对滑动，滚动和扭曲的高电阻时，机械稳定的包装分别可以在体积分数和平均配位数下分别低至0.53和2.5。只有当粒子模型包括滚动和扭曲摩擦时，才重现了实验体积分数。
Intuition tells us that a rolling or spinning sphere will eventually stop due to the presence of friction and other dissipative interactions. The resistance to rolling and spinning/twisting torque that stops a sphere also changes the microstructure of a granular packing of frictional spheres by increasing the number of constraints on the degrees of freedom of motion. We perform discrete element modeling simulations to construct sphere packings implementing a range of frictional constraints under a pressure-controlled protocol. Mechanically stable packings are achievable at volume fractions and average coordination numbers as low as 0.53 and 2.5, respectively, when the particles experience high resistance to sliding, rolling and twisting. Only when the particle model includes rolling and twisting friction, were experimental volume fractions reproduced.
