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Towards an atomistic understanding of solid friction by computer simulations

机译:通过计算机模拟对固体摩擦有原子的了解

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Friction between two solid bodies in sliding motion takes place on a large spectrum of length and time scales: From the nanometer/second scale in an atomic force microscope up to the extremely macroscopic scales of tectonic motion. Despite our familiarity with friction, fundamental questions about its atomistic origins remain unanswered. Phenomenological laws that describe the friction in many systems were published more than 300 years ago by Amontons: The frictional force is proportional to the applied load and independent of the apparent area of contact. The atomistic origins of this simple law is still controversial. Many explanations, which seemed to be well-established until recently, have been called into question by new experimental results. Computer simulations have also revealed flaws in previous theoretical approaches and led to new insights into the atomistic processes responsible for friction. In this paper, selected computer simulation studies of friction will be discussed. Special attention will be given to how it is possible to gain insight into tribological processes that take place on macroscopic time scales with the help of atomistic computer simulations which are typically constrained to the nanometer and nanosecond regime.
机译:滑动运动中的两个固体之间的摩擦发生在很大的长度和时间尺度上:从原子力显微镜的纳米/秒尺度到构造运动的极其宏观尺度。尽管我们熟悉摩擦,但有关其原子起源的基本问题仍未得到解答。描述许多系统中的摩擦的现象学定律是300多年前由Amontons发布的:摩擦力与所施加的载荷成比例,并且与表观接触面积无关。这个简单定律的原子起源仍然是有争议的。新的实验结果质疑了许多直到最近才确立的解释。计算机模拟还揭示了以前的理论方法中的缺陷,并导致了对造成摩擦的原子过程的新见解。在本文中,将讨论选定的计算机模拟摩擦研究。将特别注意如何借助原子计算机模拟(通常限于纳米和纳秒范围)来了解宏观时间尺度上发生的摩擦过程。

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