Coarse-Grained Molecular Dynamics Simulations of Nanoscale Roughness Effects on Oil Film Delamination

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Shizhe Deng, Atsushi Kubo, Yoshikazu Todaka, Yoshinori Shiihara, Masatoshi Mitsuhara, Yoshitaka Umeno
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Abstract

In boundary lubrication, the detachment of lubricant molecules from a solid surface is likely to occur due to the presence of high compressive normal stress combined with shear stress exerted on the solid–liquid interface. This phenomenon often results in a delamination behavior at the interface. We aim to investigate the nanoscale roughness effect on the oil film delamination from sliding iron surfaces with grain boundaries by coarse-grained molecular dynamics simulations. As a result, the oil film delamination was effectively suppressed in higher roughness. Two distinct mechanisms of delamination were found depending on surface roughness when the critical normal stress is exceeded. High roughness enhanced the ability to prevent complete slip but had negligible influence on partial slip.

Graphical Abstract

Abstract Image

粗粒度分子动力学模拟纳米级粗糙度对油膜分层的影响
在边界润滑中,由于固液界面上存在高压缩法向应力和剪应力,润滑剂分子很可能从固体表面脱离。这种现象通常会导致界面出现分层行为。我们旨在通过粗粒度分子动力学模拟研究纳米级粗糙度对带有晶界的滑动铁表面油膜分层的影响。结果发现,在粗糙度较高的情况下,油膜脱层现象被有效抑制。当超过临界法向应力时,发现两种不同的分层机制取决于表面粗糙度。高粗糙度增强了防止完全滑移的能力,但对部分滑移的影响微乎其微。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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