Combined lubricant–surface system perspective: Multi-scale numerical–experimental investigation
Combined lubricant–surface system perspective: Multi-scale numerical–experimental investigation
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润滑剂-表面系统组合视角：多尺度数值实验研究
DOI：
10.1177/1350650116683784
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Rahnejat
中科院分区：
文献类型：
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作者：
M. Leighton;T. Nicholls;M. Cruz;R. Rahmani;H. Rahnejat
摩擦损失是所有机器和机构能源效率降低的主要原因之一。特别是，各种类型车辆的制造商面临越来越大的压力，要求遵守有关有害排放的日益严格的立法和指令。因此，减少摩擦已成为当务之急。单独处理表面材料和润滑剂配方的传统方法已被润滑剂-表面系统方法所取代。本文介绍了从超薄表面吸附膜的纳米/介观尺度侧向力显微镜到微米尺度精密滑动摩擦测量的多尺度实验，以研究混合润滑体系内润滑剂-表面摩擦的优化，使用具有不同有机和无机摩擦改性物质的润滑剂。这些会影响系统的参数，通常用作混合和边界润滑状态模型的输入。因此，在不同物理尺度上精确测量这些参数非常重要。该研究还通过平均雷诺方程的组合求解以及混合和边界润滑状态中润湿粗糙体的相互作用，利用微观尺度上的详细数值预测。微观尺度摩擦相互作用的预测和测量之间存在良好的一致性。此外，在物理尺度的测试中也观察到了相同的趋势。
Frictional losses are one of the main causes of reduced energy efficiency in all machines and mechanisms. In particular, there is mounting pressure upon manufacturers of all forms of vehicle to comply with increasingly stringent legislation and directives with regard to harmful emissions. Therefore, reduction of friction has become an imperative issue. The traditional approach of dealing with surface material and lubricant formulation in isolation has been replaced by a lubricant–surface system approach. This paper presents multi-scale experimentation from nano/meso-scale lateral force microscopy of ultra-thin surface adsorbed films through to micro-scale precision sliding tribometry to investigate lubricant–surface friction optimisation within the mixed regime of lubrication, using lubricants with different organic and inorganic friction modifying species. These affect the parameters of the system, commonly used as input to models for mixed and boundary regimes of lubrication. Therefore, the precise measurement of these parameters at different physical scales is important. The study also makes use of detailed numerical predictions at micro-scale through combined solution of the average Reynolds equation as well as interaction of wetted asperities in mixed and boundary regimes of lubrication. Good agreement is found between the predictions and measurements at micro-scale tribometric interactions. Furthermore, the same trends are observed in testing across the physical scales.