Nanoscale elastoplastic adhesion of wet asperities
Nanoscale elastoplastic adhesion of wet asperities
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DOI：
10.1177/1350650112472142
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
W. Chong;M. Teodorescu;H. Rahnejat
中科院分区：
文献类型：
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作者：
W. Chong;M. Teodorescu;H. Rahnejat
准确预测摩擦对于包括各种接触的许多设备的设计和高效运行至关重要。在实践中，接触表面是粗糙的并且通常是湿的。有多种机制会导致摩擦，包括粘性流体膜的粘性剪切，以及边界活性分子物质的薄吸附层的粘性剪切。另外，配合表面上的粗糙体可能发生粘附和弹塑性变形。传统的摩擦模型基于表面形貌的统计表示以及基于理论润滑剂膜艾林剪切应力的边界剪切膜的描述。该研究报告了比传统摩擦模型更真实的摩擦模型，该模型没有考虑粗糙体的潮湿性质。流体-表面相互作用是本文的主要贡献，迄今为止尚未在文献中报道。结果表明，忽略表面湿度的影响会导致边界摩擦力的高估和接触承载能力的低估。
Accurate prediction of friction is crucial for design and efficient operation of many devices, comprising various contacts. In practice, contacting surfaces are rough and often wet. There are several mechanisms, which contribute to friction, including viscous shear of a coherent fluid film, as well as that of a thin adsorbed layer of boundary active molecular species. Additionally, adhesion and elastoplastic deformation of asperities on counterface surfaces may occur. Traditional friction models are based on statistical representation of surface topography as well as description of boundary shear films based on the theoretical lubricant film Eyring shear stress. The study reports a more realistic friction model than the traditional ones, which do not take into account the wet nature of the asperities. The fluid–surface interaction is a main contribution of the article, not hitherto reported in literature. It is shown that ignoring the effect of surface wetness can lead to the over-estimation of boundary friction and under-estimation of contact load-carrying capacity.