论文部分内容阅读
摩擦界面的失效方式对于我们从根本上认识工程学至地震学领域中的失效过程非常关键。摩擦运动起始于将两个剪切体分离的薄界面内传播的破裂前沿。通过测定沿界面的剪切应力和法向应力,结合随后的实际接触面积动态学特性,我们发现剪切应力与法向应力之比在局部可远远超过没有发生突然滑动的静摩擦系数。而且,系统所选的不同破裂模式与局部应力比的不同控制程度相对应。这些结果表明非均匀性在摩擦稳定性及动力学特性方面起着至关重要的作用,这对不同地震模式的预测、选择和确定有着启示意义。
The failure mode of the friction interface is crucial for us to fundamentally understand the failure process from engineering to seismology. Frictional motion starts at the fracture front propagating in a thin interface separating the two shear bodies. By measuring the shear stress and the normal stress along the interface, combined with the subsequent dynamic characteristics of the actual contact area, we find that the ratio of shear stress to normal stress can locally far exceed the static friction coefficient without abrupt sliding. Moreover, the different rupture modes selected by the system correspond to different degrees of control of the local stress ratio. These results indicate that inhomogeneity plays a crucial role in the frictional stability and dynamics, which is of significance for the prediction, selection and determination of different seismic modes.