Abstract
Frictional motion is intrinsically complex, resulting from the interactions between driving forces, interfacial nonlinearity and instabilities, material inertia, and bulk geometry contacts. In the present paper, a two-dimensional interface friction model with a single micro-bulge is established, and the wave phenomenon at the friction interface is numerically simulated and analyzed by the finite element method. The simulation results show that in the micro-process of loading, there are significant stress fluctuations and fine wave structure characteristics at the frictional interface. A new interesting wave phenomenon occurs when the incident stress wave has not yet propagated to the micro-bulge position, a micro-stress disturbance has been generated from the interface and propagated to the substrate by a longitudinal wave. This wave phenomenon implies that the overall response of the interface precedes the local wave response of the matrix. More comparative simulations and analyses proved that the overall gravity micro-adjustment on the interface might be responsible for such new waves. This study reveals a new wave phenomenson in the early stage of interface friction, which predicts earthquake in advance.
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