Molecular dynamics simulation of friction and heat properties of Nano-texture GOLD film in space environment
Molecular dynamics simulation of friction and heat properties of Nano-texture GOLD film in space environment
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DOI：
10.1016/j.surfcoat.2018.11.084
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发表时间：
2019-01
影响因子：
5.4
通讯作者：
R. Tong;Bing Han;Ze-fen Quan;Geng Liu
中科院分区：
文献类型：
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作者：
R. Tong;Bing Han;Ze-fen Quan;Geng Liu
本文提出了一种分子动力学模型来描述空间环境中铰链机构的碰撞摩擦。 EAM势用于描述原子之间的相互作用。基于该模型，研究了不同压头振幅、频率和晶体取向下压头与光滑金膜表面之间的碰撞摩擦过程和热性能。分析了金膜的温度分布和碰撞摩擦机理。仿真结果表明，在一定频率范围内提高压头的振动频率可以减小摩擦力。不同频率下压头的振幅和晶体取向对平均摩擦力和基体表面温度表现出不同的影响。此外，还在金膜上制作了织构，并研究了织构宽度和织构深度对摩擦和热性能的影响。结果表明，纹理表面可以显着降低摩擦力。基材的平均摩擦力和表面温度随着织构深度的增加而减小，随着织构宽度的增加而增加。平均摩擦力和基材表面温度对织构深度较为敏感。
In this paper, a molecular dynamics model is proposed to describe the collision friction of a hinge mechanism in the space environment. The EAM potential is used to describe the interaction between atoms. Based on the model, the collision friction process and thermal properties between the indenter and smooth gold film surface at different indenter amplitudes, frequencies and crystal orientations are studied. The temperature distribution and collision friction mechanism of the gold film are analyzed. The simulation results show that increasing the vibration frequency of the indenter in a certain frequency range can reduce the friction force. The amplitude of the indenter and crystal orientations at different frequencies shows different effects on the average friction force and the surface temperature of the substrate. In addition, textures are also made on the gold film and the effects of texture width and texture depth on the friction and thermal properties are investigated. The results show that the textured surface can significantly reduce the friction force. The average friction force and the surface temperature of the substrate decrease with the increase of texture depth, and increase with the increase of texture width. The average friction force and the surface temperature of the substrate are more sensitive to the texture depth.