A modified multibond model for nanoscale static friction
A modified multibond model for nanoscale static friction
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DOI：
10.1098/rsta.2021.0342
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发表时间：
2022-09-19
期刊：
影响因子：
5
通讯作者：
Carpick, Robert W.
中科院分区：
文献类型：
--
作者：
Milne, Zachary B.;Hasz, Kathryn;Carpick, Robert W.
在实验中观察到的纳米级摩擦现象的几个关键特征，包括粘滑平滑滑动过渡和摩擦的速度和温度依赖性，通常由降阶模型描述。其中最著名的是热普朗特-汤姆林森模型和多键模型。在这里，我们提出了一个修改的多键（mMB）模型，其中一个基于物理的标准-一个关键的键拉伸长度-是用来描述界面键断裂。该模型明确纳入阻尼的悬臂和接触材料。与Fokker-Planck形式主义的比较支持了这个新模型的结果，证实了它捕捉相关物理的能力。此外，mMB模型复制了在许多实验中看到的摩擦随着横向扫描速度增加的近对数趋势。该模型也可以用来探测相关和不相关的粘滑。通过更好地理解系统中阻尼和噪声的影响，以及更准确地模拟具有多个相互作用位点的系统的能力，该模型扩展了可以研究的摩擦系统和现象的范围。本文是主题“自然和工业中的纳米裂纹”的一部分。
Several key features of nanoscale friction phenomena observed in experiments, including the stick-slip to smooth sliding transition and the velocity and temperature dependence of friction, are often described by reduced-order models. The most notable of these are the thermal Prandtl-Tomlinson model and the multibond model. Here we present a modified multibond (mMB) model whereby a physically-based criterion-a critical bond stretch length-is used to describe interfacial bond breaking. The model explicitly incorporates damping in both the cantilever and the contacting materials. Comparison to the Fokker-Planck formalism supports the results of this new model, confirming its ability to capture the relevant physics. Furthermore, the mMB model replicates the near-logarithmic trend of increasing friction with lateral scanning speed seen in many experiments. The model can also be used to probe both correlated and uncorrelated stick slip. Through greater understanding of the effects of damping and noise in the system and the ability to more accurately simulate a system with multiple interaction sites, this model extends the range of frictional systems and phenomena that can be investigated.This article is part of the theme issue 'Nanocracks in nature and industry'.