Towards a deeper understanding of wear and friction on the atomic scale - a molecular dynamics analysis
Towards a deeper understanding of wear and friction on the atomic scale - a molecular dynamics analysis
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DOI：
10.1016/s0043-1648(97)00073-2
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发表时间：
1997-10-01
期刊：
影响因子：
5
通讯作者：
Tanaka, H
中科院分区：
文献类型：
--
作者：
Zhang, LC;Tanaka, H
本研究旨在通过借助分子动力学分析研究典型的金刚石-铜滑动系统，深入了解原子尺度上的磨损和摩擦机制。研究表明，一般存在四种不同的变形状态，即无磨损状态、粘附状态、犁耕状态和切削状态。这些状态之间的转变由关键滑动参数控制，例如压痕深度、滑动速度和表面润滑条件。无磨损状态存在于各种压痕深度，因此即使在化学清洁条件下，实际滑动系统的无磨损设计也是可能的。在切削状态下，系统的摩擦行为遵循比例定律。然而，在所有其他情况下，摩擦力的变化是复杂的，不能用简单的公式来描述。研究还指出，在原子尺度上，位错运动产生的滑移线与塑性滑移线理论预测的滑移线有很大不同。需要开发一种新理论来弥合原子分析和微观分析之间的差距。 (C) 1997 Elsevier Science S.A.
This study aims to gain an in-depth understanding of the mechanisms of wear and friction on the atomic scale through the investigation of a typical diamond-copper sliding system with the aid of molecular dynamics analysis. The study revealed that there generally exist four distinct regimes of deformation, i.e. the no-wear regime, adhering regime, ploughing regime and cutting regime. The transition between these regimes is governed by key sliding parameters such as indentation depth, sliding speed and surface lubrication conditions. The no-wear regime exists for a wide range of indentation depths and thus a no-wear design of practical sliding systems is possible even under chemically clean conditions. In the cutting regime, the frictional behaviour of the system follows a proportional law. In all the other regimes, however, the variation of the frictional force is complex and cannot be described by a simple formula. The study also pointed out that on the atomic scale the slip lines generated by dislocation motion are very different from those predicted by the slip-line theory of plasticity. A new theory needs to be developed to bridge the gap between atomic and micro analyses. (C) 1997 Elsevier Science S.A.