摩擦动力学:滑动摩擦时的位移波动。

IF 2.8 3区 化学 Q3 CHEMISTRY, PHYSICAL
Soft Matter Pub Date : 2025-08-05 DOI:10.1039/D5SM00617A
R. Xu, F. Zhou and B. N. J. Persson
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引用次数: 0

摘要

我们研究了由橡胶或聚甲基丙烯酸甲酯(PMMA)制成的矩形块在恒定驱动力下在各种基材上滑动时位置的波动(噪声)。对于所有系统,噪声的功率谱表现出具有幂律的大低频区域,ω-γ,指数γ在4到5之间。实验结果与模拟和分析预测进行了比较,采用了三种界面相互作用模型:弹簧块模型、粗糙力模型和磨损颗粒模型。在弹簧块模型中,小的子块(代表粗糙的接触区域)通过粘弹性弹簧连接到更大的块上,并通过在时间和大小上随机波动的力与基材相互作用。该模型给出了一个γ = 4的幂律,在实验中也观察到没有磨损颗粒。粗糙力模型假设一个光滑的块体在随机粗糙的基材上滑动,由于接触区域的数量和大小的波动,作用在块体上的力随时间而波动。该模型预测了一个指数为γ = 6的幂律,这与实验结果不一致。我们将这种差异归因于在粗糙接触形成或消失时忽略了载荷再分配。磨损颗粒模型考虑了不同尺寸磨损颗粒在界面处运动的不规则动力学。该模型也预测幂律功率谱,但指数依赖于两个捕获-释放概率分布。如果选择合适,它可以重现指数γ = 5(对应于1/f噪音的摩擦力),在某些情况下观察到。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Friction dynamics: displacement fluctuations during sliding friction

Friction dynamics: displacement fluctuations during sliding friction

We have investigated the fluctuations (noise) in the positions of rectangular blocks, made from rubber or polymethyl methacrylate (PMMA), sliding on various substrates under constant driving forces. For all systems the power spectra of the noise exhibit large low-frequency regions with power laws, ωγ, with the exponents γ between 4 and 5. The experimental results are compared to simulations and analytical predictions using three models of interfacial interaction: a spring-block model, an asperity-force model, and a wear-particle model. In the spring-block model, small sub-blocks (representing asperity contact regions) are connected to a larger block via viscoelastic springs and interact with the substrate through forces that fluctuate randomly in both time and magnitude. This model gives a power law with γ = 4, as also observed in experiments when no wear particles can be observed. The asperity-force model assumes a smooth block sliding over a randomly rough substrate, where the force acting on the block fluctuates in time because of fluctuations in the number and size of contact regions. This model predicts a power law with the exponent γ = 6, which disagrees with the experiments. We attribute this discrepancy to the neglect of load redistribution among asperity contacts as they form or disappear. The wear-particle model considers the irregular dynamics of wear particles of varying sizes moving at the interface. This model also predicts power-law power spectra but the exponent depends on two trapping-release probability distributions. If chosen suitably it can reproduce the exponent γ = 5 (which corresponds to 1/f noise in the friction force) observed in some cases.

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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Soft Matter is an international journal published by the Royal Society of Chemistry using Engineering-Materials Science: A Synthesis as its research focus. It publishes original research articles, review articles, and synthesis articles related to this field, reporting the latest discoveries in the relevant theoretical, practical, and applied disciplines in a timely manner, and aims to promote the rapid exchange of scientific information in this subject area. The journal is an open access journal. The journal is an open access journal and has not been placed on the alert list in the last three years.
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