[NCTS Physics Research Highlights] Hsuan-Yi Chen & Pik-Yin Lai 'Statistical laws of stick-slip friction at mesoscale', Nature Communications 14, 6221 (2023)

• 2023-11-24
• Chen, Jhan Yu 陳詹喻
• Chemical physics, physical chemistry, nanoscience and complex systems Interdisciplinary Research

Statistical laws of stick-slip friction at mesoscale 介觀尺度的黏滑摩擦統計定律

Caishan Yan, Hsuan-Yi Chen*, Pik-Yin Lai* & Penger Tong
Nature Communications 14, 6221 (2023)
DOI: https://doi.org/10.1038/s41467-023-41850-1

We demonstrated that there indeed exists a critical regime in which stick-slip friction can be described by a common set of statistical laws of avalanche dynamics. For instance, the maximal force needed to trigger the local slips obeys the generalized extreme value distribution very well whereas the slip lengths are well-characterized by a power-law distribution with the power-law exponent explained. Furthermore, the stick-slip motion of the scanning probe can be envisioned as a result of its center-of-mass moving in a random pinning force field described by an under-damped spring-block model subjected to a Brownian-correlated pinning force field. It is that the model captures the essential physics of the stick-slip friction at mesoscale, providing a long-sought physical mechanism for the avalanche dynamics in stick-slip friction.

我們證明確實其中可以透過一組通用的雪崩動力學統計定律來描述黏滑摩擦。例如，觸發局部滑移所需的最大力服從廣義極值分佈，而滑移長度則透過冪律分佈很好地表徵，並解釋了冪律指數。此外，掃描探頭的黏滑運動可以想像為其質心在隨機釘扎場中移動的結果，該隨機釘扎力場由受到布朗相關釘扎力場的欠阻尼彈簧塊模型描述。我們證明該模型捕捉了黏滑摩擦的基本物理原理，為黏滑摩擦中的雪崩動力學提供了長期尋求的物理機制。