具有滑动、滚动和扭转摩擦的颗粒填料
Granular packings with sliding, rolling and twisting friction
摘要：
直觉告诉我们，由于摩擦和其他耗散相互作用的存在，滚动或旋转的球体最终会停止。阻止球体的滚动和旋转/扭转扭矩的阻力也通过增加对运动自由度的约束的数量来改变摩擦球体的颗粒堆积的微观结构。我们进行离散元建模模拟，以构建球体填料实施一系列的摩擦约束下的压力控制协议。当颗粒经历高的滑动、滚动和扭转阻力时，可分别在低至0.53和2.5的体积分数和平均配位数下实现机械稳定的填料。只有当颗粒模型包括滚动和扭转摩擦时，才能重现实验体积分数。
英文摘要：
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.
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