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 or 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.

中文翻译：

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粒状填料具有滑动，滚动和扭曲摩擦

直觉告诉我们，由于存在摩擦和其他耗散性相互作用，滚动或旋转的球体最终将停止运动。通过增加对运动自由度的约束数量，使球体停止运动的抵抗滚动和旋转或扭转扭矩的作用也改变了摩擦球体的颗粒状填充物的微观结构。我们执行离散元素建模仿真，以构造球填料，在压力控制方案下实现一系列摩擦约束。当颗粒具有很高的抗滑动，滚动和扭曲性能时，机械稳定填料的体积分数和平均配位数分别低至0.53和2.5。