论文标题
摩擦滑动开始时滑动前体和拓扑长度尺度之间的相关性
Correlation between slip precursors and topological length scales at the onset of frictional sliding
论文作者
论文摘要
在许多问题中，从摩擦学到研究地震和地震断层之间的许多问题，了解涉及摩擦的许多问题，了解并发长度尺度之间的相互作用是一个基本问题。一方面，宏观滑动事件之前是具有特征性繁殖长度尺度的滑动前体。另一方面，可以通过表面图案来修改新兴的摩擦特性，具体取决于其几何长度尺度。这表明结构化表面的宏观滑动受滑动前体的长度尺度与表征几何特征的相互作用的控制。在本文中，我们使用二维弹簧模型通过数值模拟来研究这些方面。我们讨论了几何特征对滑移前体的发生和定位的影响，从而将研究扩展到以两个几何长度尺度为特征的接口。我们发现，不同类型的分离序列是由特定的表面结构触发的，具体取决于它们的尺度和与滑动方向的关系，从而导致宏观平滑过渡到分层和/或各向异性特征的情况下。可以在从静态滑动到动态滑动的设备中利用这些概念，并可以改善对地震数据的理解和解释
Understanding the interplay between concurrent length scales is a fundamental issue in many problems involving friction between sliding interfaces, from tribology to the study of earthquakes and seismic faults. On the one hand, a macroscopic sliding event is preceded by slip precursors with a characteristic propagation length scale. On the other hand, the emergent frictional properties can be modified by surface patterning depending on their geometric length scale. This suggests that macroscopic sliding of structured surfaces is governed by the interplay between the length scale of the slip precursors and those characterizing the geometric features. In this paper, we investigate these aspects by means of numerical simulations using a two-dimensional spring-block model. We discuss the influence of the geometric features on the occurrence and localization of slip precursors, extending the study to interfaces characterized by two geometric length scales. We find that different types of detachment sequences are triggered by specific surface structures, depending on their scales and relation to sliding direction, leading to a macroscopically smooth transition to sliding in the case of hierarchical and/or anisotropic features. These concepts could be exploited in devices switching from static to dynamic sliding, and can contribute to an improvement in the understanding and interpretation of seismic data
