The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Phys Rev Lett. 2011 Jun 24;106(25):254301. doi: 10.1103/PhysRevLett.106.254301. Epub 2011 Jun 20.
The static friction coefficient between two materials is considered to be a material constant. We present experiments demonstrating that the ratio of shear to normal force needed to move contacting bodies can, instead, vary systematically with controllable changes in the external loading configuration. Large variations in both the friction coefficient and consequent stress drop are tightly linked to changes in the rupture dynamics of the rough interface separating the two bodies.
我们提出的实验表明，与接触物体相对运动所需的剪切力与法向力的比值可以随外部加载配置的可控变化而系统地变化，而不是被认为是材料常数的两个材料之间的静摩擦系数。摩擦系数和相应的应力降的大幅变化与分离两个物体的粗糙界面的破裂动力学的变化密切相关。
