颗粒物质与固体交界面静摩擦系数的测量与分析

Measurement and analysis of static friction coefficient on a granular-solid interface

颗粒物质与固体界面的摩擦力是当前颗粒物理研究中经常遇到的边界条件,但文献上对其取值有较大分歧。本文实验测量了颗粒物质与不同固体界面的最大静摩擦力,发现界面摩擦均满足达芬奇摩擦定律,且测得的静摩擦系数约在0.17～0.20之间。而材料手册中同样材料的固-固接触摩擦系数高达0.94,这表明一般不能直接用材料手册的摩擦系数值分析讨论与它有关的颗粒问题。

The friction on the interface between a granular medium and a general solid is an important boundary condition, which is often encountered in research of granular physics. Since the value of the friction coefficients are very different in published results, a specialized measurement and research is needed. In this experiment, the coefficient of maximum static friction between the granular matter and different solid surfaces was measured, and the inferface friction follows the friction law of da Vinci. The measured static friction coefficients of the granular-solid interfaces were about 0. 17-0. 20, while the value in handbook of materials, for solid-solid interface of same materials is about 0. 94. These results indicate that the coefficient of friction in the materials handbook can not be directly applied to the problem of granular physics.