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Vibration Induced Reciprocating Sliding Contacts between Nanoscale Multi-Asperity Tips and a Textured Surface
Microgravity Science and Technology ( IF 1.8 ) Pub Date : 2019-09-15 , DOI: 10.1007/s12217-019-09745-3
Ruiting Tong , Geng Liu

Microgravity and vacuum are two main environments in outer space. In the microgravity environment, vibration is a typical phenomenon, and it will induce a reciprocating sliding contact between a journal and a bearing in a clearance joint. In vacuum environment, the adhesion effects are severe, and the friction forces are much higher than the ground environment. Nanoscale textures can reduce the contact area and trap the wear particles, which are beneficial to the friction reduction. Most of the current studies focus on the single-pass sliding contact. Actually, considering the roughness of the contact surfaces, a multi-asperity tip should be more reasonable. In this paper, vibration induced reciprocating sliding contacts between nanoscale multi-asperity tips and a textured surface are investigated using a multiscale method, and the material is FCC copper. Six rigid tips are modelled with different cylindrical asperities and slid on the textured surface. Corresponding to the tips, the average friction forces are compared, and the effects of the tip radii are analyzed. The total average friction forces of the textured surface are compared with the case of a smooth surface, and the mechanism of the friction reduction is discussed. The results showed that the total average friction forces decrease as the increase of the asperity radii, and the textured surface can reduce friction forces effectively compared with the smooth surface. This work could contribute to reducing friction by designing the tip and the textured surface in vibration induced reciprocating sliding contacts under microgravity, which will be beneficial to prolong the life of components on the spacecraft.

中文翻译:

纳米级多粗糙尖端与纹理表面之间的振动诱导的往复滑动接触

微重力和真空是外层空间的两个主要环境。在微重力环境中,振动是一种典型现象,它将在轴颈和游隙接头中的轴承之间引起往复滑动接触。在真空环境下,粘附作用严重,摩擦力远高于地面环境。纳米级纹理可以减少接触面积并捕获磨损颗粒,这有利于减少摩擦。当前大多数研究集中在单程滑动接触上。实际上,考虑到接触表面的粗糙度,多粗糙尖端应更为合理。在本文中,使用多尺度方法研究了纳米级多粗糙尖端与纹理表面之间的振动诱导的往复滑动接触,材料是FCC铜。对六个刚性尖端进行了建模,使其具有不同的圆柱状凹凸并在带纹理的表面上滑动。对应于尖端,比较平均摩擦力,并分析尖端半径的影响。将光滑表面的总平均摩擦力与光滑表面的情况进行比较,并讨论了减小摩擦的机理。结果表明,总平均摩擦力随着粗糙半径的增加而减小,与光滑表面相比,凹凸面可以有效降低摩擦力。这项工作可以通过在微重力下设计振动感应往复滑动触点中的尖端和纹理表面来减少摩擦,这将有利于延长航天器上部件的寿命。
更新日期:2019-09-15
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