arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1604.01565cond-mat.stat-mech
收藏

二维Frenkel-Kontorova模型中的涌现摩擦

Emergent friction in two-dimensional Frenkel-Kontorova models

Jesper Norell, Annalisa Fasolino, Astrid S. de Wijn

摘要:

简单的摩擦模型通常是一维的,但真实的界面是二维的。本文采用Frenkel-Kontorova(FK)模型研究了第二维对静摩擦和动摩擦的影响。我们研究了FK模型的两个最简单的扩展到二维和模拟的静态和动态特性。我们表明,静摩擦的行为是强大的,并保持类似的物理合理的参数值在两个维度。然而,动态摩擦力的强烈影响的第二维度和随之而来的额外的动力学和参数引入到模型中。我们讨论了我们的结果的热平衡和声子色散关系的晶格,建立一个物理上现实的和合适的二维扩展的FK模型。我们发现,额外的耗散通道的存在下,可以增加摩擦,并产生显着不同的温度依赖性相比,一维的情况下。我们还简要地研究了各向异性的动态摩擦,并显示高度非平凡的影响,包括摩擦各向异性可以导致在不同方向上的运动取决于初始速度的值。

英文摘要:

Simple models for friction are typically one-dimensional, but real interfaces are two-dimensional. We investigate the effects of the second dimension on static and dynamic friction by using the Frenkel-Kontorova (FK) model. We study the two most straightforward extensions of the FK model to two dimensions and simulate both the static and dynamic properties. We show that the behavior of the static friction is robust and remains similar in two dimensions for physically reasonable parameter values. The dynamic friction, however, is strongly influenced by the second dimension and the accompanying additional dynamics and parameters introduced into the models. We discuss our results in terms of the thermal equilibration and phonon dispersion relations of the lattices, establishing a physically realistic and suitable two-dimensional extension of the FK model. We find that the presence of additional dissipation channels can increase the friction and produces significantly different temperature-dependence when compared to the one-dimensional case. We also briefly study the anisotropy of the dynamic friction and show highly nontrivial effects, including that the friction anisotropy can lead to motion in different directions depending on the value of the initial velocity.

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。

↑