In space environment, the adhesion effects can cause a high adhesion component of a friction force, and the impact effects caused by the microgravity can induce a high ploughing component, so the friction force is higher than the ground environment. Nanoscale textures affect the adhesion behaviors by reducing contact areas, and they also vary the shear strength of the interface, which are beneficial to the friction reduction. Considering the impact effects, the motion of a clearance joint is simplified as a unidirectional reciprocating sliding contact, and a multiscale model is employed to investigate the friction and wear characteristics between a rigid cylindrical tip and nanoscale textured surfaces. The effects of texture shapes on running-in stages, average friction forces and wear characteristics are investigated. The results show that the isosceles trapezoid textured surface (surface II) and the surface with right-angled trapezoid textures on the right side (surface III) can come to steady states for different sliding modes. Surface II presents the lowest total average friction force to show its potential to reduce friction forces. The worn atoms are the least for surface III, and surface III can be used to improve the wear behaviors. The impact effects make that the unidirectional reciprocating sliding contacts show higher total average friction forces than reciprocating sliding contacts. This work could contribute to designing textured surfaces, reducing friction and wear in unidirectional reciprocating sliding contacts under impact effects in microgravity environment, and help to prolong the life of components in the spacecraft.

中文翻译：

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考虑微重力环境影响的纳米质感表面单向往复滑动接触建模

在空间环境中，粘附力会引起摩擦力的高粘附力分量，而由微重力引起的冲击力会引起高的耕作分量，因此摩擦力高于地面环境。纳米级纹理会通过减少接触面积来影响粘合行为，并且还会改变界面的剪切强度，这有利于减小摩擦。考虑到冲击效应，间隙接头的运动简化为单向往复滑动接触，并采用多尺度模型研究刚性圆柱尖端与纳米尺度纹理化表面之间的摩擦和磨损特性。研究了织构形状对磨合阶段，平均摩擦力和磨损特性的影响。结果表明，等腰梯形纹理表面（表面II）和右侧具有直角梯形纹理的表面（表面III）可以在不同的滑动模式下达到稳态。表面II呈现最低的总平均摩擦力，以显示其减小摩擦力的潜力。表面III的磨损原子最少，表面III可用于改善磨损行为。冲击效果使得单向往复滑动接触件显示出比往复滑动接触件更高的总平均摩擦力。这项工作可能有助于设计纹理表面，减少微重力环境下在冲击作用下的单向往复滑动触点的摩擦和磨损，并有助于延长航天器中部件的寿命。