论文标题
剪切厚度和密集悬浮液的干扰：摩擦的“卷”
Shear thickening and jamming of dense suspensions: the "roll" of friction
论文作者
论文摘要
基于粒子的不连续剪切增厚（DST）和剪切干扰（SJ）悬浮液的模拟用于研究压力激活的约束的作用，重点是对齿轮样滚动的抗性。滚动摩擦减少了DST和SJ所需的体积分数，与现实生活中的悬浮液具有粘合表面化学和“粗糙”颗粒形状。与仅滑动摩擦相比，它设定了摩擦力网络的独特结构，从动态的角度来看，它导致速度相关长度的增加，部分原因是粘度增加。因此，滚动摩擦的物理学是对强烈剪切厚的材料的全面理解的关键要素。
Particle-based simulations of discontinuous shear thickening (DST) and shear jamming (SJ) suspensions are used to study the role of stress-activated constraints, with an emphasis on resistance to gear-like rolling. Rolling friction decreases the volume fraction required for DST and SJ, in quantitative agreement with real-life suspensions with adhesive surface chemistries and "rough" particle shapes. It sets a distinct structure of the frictional force network compared to only sliding friction, and from a dynamical perspective leads to an increase in the velocity correlation length, in part responsible for the increased viscosity. The physics of rolling friction is thus a key element in achieving a comprehensive understanding of strongly shear-thickening materials.
