Abstract The third body approach deals with friction as a problem of third body rheology. Using a multibody meshfree model, we report influence of cohesion on third body rheology and friction at a dry sliding contact. With cohesion increasing from 0.0001 to 20 GPa, friction firstly increases linearly then transitions to a constant value, based on which three friction regimes are identified. Low cohesion (0.0001–1 GPa) is featured by lamellar flow; medium cohesion (1–5 GPa) triggers formation of strong inclined force chains; high cohesion (5–20 GPa) results in generation and rolling of agglomerates. How third bodies accommodate velocity gradient and transfer load are carefully examined. The results provide a possible novel approach of material design to monitor the coefficient of friction.

中文翻译：

---

通过多体无网格模型观察到的干滑动界面摩擦中第三体流变学的意义：粒子间内聚力的影响

摘要 第三体方法将摩擦视为第三体流变学问题。使用多体无网格模型，我们报告了干滑动接触时内聚力对第三体流变学和摩擦的影响。随着内聚力从 0.0001 增加到 20 GPa，摩擦首先线性增加然后过渡到一个恒定值，基于此确定了三种摩擦状态。低内聚力 (0.0001–1 GPa) 以层流为特征；中等内聚力（1-5 GPa）触发形成强倾斜力链；高内聚力 (5-20 GPa) 会导致团聚体的产生和滚动。仔细研究了第三体如何适应速度梯度和传递载荷。结果提供了一种可能的材料设计新方法来监测摩擦系数。