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从工程到地震研究领域,摩擦界面破坏的方式是我们基本认识破坏过程的关键。摩擦滑动由破裂前锋发动,在分开两个剪切体的薄层界面内传播。通过测量沿界面的剪切应力和法向应力,以及随后的快速实际接触面的动态,我们发现,剪切应力与法向应力的比值在局部可能远远超过静摩擦系数而无快速滑动。并且,由系统确定的不同破裂模式相应于截然不同的局部应力比。这些结果说明了非均匀性对摩擦的稳定性和动力影响的关键作用,及对预测、挑选和阻止地震不同模式的意义。
From engineering to seismic research, the way the friction interface is destroyed is the key to our basic understanding of the destruction process. Frictional sliding is initiated by the fracturing front and propagates within the thin-layer interface that separates the two shear bodies. By measuring the shear stresses and normal stresses along the interface and the subsequent rapid real-world contact surface dynamics, we find that the ratio of shear stress to normal stress may locally exceed the static friction coefficient without rapid slippage. And, the different modes of rupture determined by the system correspond to distinct local stress ratios. These results illustrate the key role of inhomogeneity in frictional stability and dynamic effects and their implications for predicting, selecting, and preventing different modes of earthquakes.