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arXiv 1208.5565cond-mat.mtrl-scicond-mat.stat-mech
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滑动摩擦模拟中的最优能量耗散

Optimal Energy Dissipation in Sliding Friction Simulations

A. Benassi, A. Vanossi, G. E. Santoro, E. Tosatti

摘要:

非平衡态分子动力学模拟在滑动摩擦研究中具有重要意义,但在去除摩擦产生的焦耳热过程中存在任意性和不确定性。一般预先存在的配方的基础上,我们实现了一个完全微观耗散的方法,基于无参数,非马尔可夫,随机动力学,吸收焦耳热相当于一个半无限的固体和谐波基板。作为一个测试案例,我们调查的粘滑摩擦滑块在二维Lennard-Jones固体,比较我们几乎精确的摩擦结果与近似的,从常用的耗散方案。值得注意的是,精确的结果可以密切复制的标准朗之万耗散计划,一旦其参数确定根据一般和自立的变分过程。

英文摘要:

Non-equilibrium molecular dynamics simulations, of crucial importance in sliding friction, are hampered by arbitrariness and uncertainties in the removal of the frictionally generated Joule heat. Building upon general pre-existing formulation, we implement a fully microscopic dissipation approach which, based on a parameter-free, non-Markovian, stochastic dynamics, absorbs Joule heat equivalently to a semi-infinite solid and harmonic substrate. As a test case, we investigate the stick-slip friction of a slider over a two-dimensional Lennard-Jones solid, comparing our virtually exact frictional results with approximate ones from commonly adopted dissipation schemes. Remarkably, the exact results can be closely reproduced by a standard Langevin dissipation scheme, once its parameters are determined according to a general and self-standing variational procedure.

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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