arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.09300cond-mat.soft
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关于滑动摩擦的起源:晶格俘获的作用

On the origin of sliding friction: Role of lattice trapping

J. Wang, A. Tiwari, I. M. Sivebaek, B. N. J Persson

摘要:

利用分子动力学,我们研究了当弹性板(块)在具有${\rm sin} (q_0 x)$表面高度轮廓的刚性基底上滑动时,摩擦力对滑动速度的依赖性。摩擦力几乎是速度无关的,由于声子发射在关闭和开放的裂纹尖端,在那里快速的原子管理单元在滑动过程中发生的事件。快速事件的结果从晶格捕获和密切相关的速度间隙和滞后效应中观察到的裂纹在固体中的扩展模型研究。这表明摩擦力主要由接触区域边缘处发生的过程控制,这通过计算证实,该计算表明摩擦力与法向力无关。当滑动速度接近固体横向声速时,摩擦力急剧增加,正如裂纹理论所预期的那样。

英文摘要:

Using molecular dynamics we study the dependence of the friction force on the sliding speed when an elastic slab (block) is sliding on a rigid substrate with a ${\rm sin} (q_0 x)$ surface height profile. The friction force is nearly velocity independent due to phonon emission at the closing and opening crack tips, where rapid atomic snap-in and -out events occur during sliding. The rapid events result from lattice trapping and are closely related to the velocity gap and hysteresis effects observed in model studies of crack propagation in solids. This indicates that the friction force is dominated by processes occurring at the edges of the contact area, which is confirmed by calculations showing that the friction force is independent of the normal force. The friction force increases drastically when the sliding velocity approaches the solid transverse sound velocity, as expected from the theory of cracks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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