Collaborative Research: Quantitative Prediction of Sliding Friction Using Integrated Theory and Experiments

合作研究：利用理论与实验相结合的滑动摩擦定量预测

• 批准号: 1265594
• 负责人: Ashlie Martini
• 金额: $ 24.6万
• 依托单位: University of California - Merced
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-01 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1265594&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantitative; Prediction; Sliding

This research is about obtaining a quantitative understanding of energy dissipation, interfacial structure and friction of model boundary films. While theoretical methods have hitherto been able to provide qualitative insights into sliding friction, they have not yet been able to quantitatively describe the structure of a sliding interface and the associated friction forces. The approach of this research will be to combine experiments in ultrahigh vacuum on well-defined model boundary films consisting of a range of isostructural alkali halides on metal substrates with molecular dynamics simulations using tailored, high-precision interaction potentials obtained from density function theory calculations of the same systems. If successful, the benefits of this research will include an understanding of the friction properties of the boundary films that are formed by chemical reactions between lubricant additives or gas-phase lubricants at a sliding, solid-solid interface. This fundamental understanding will underpin efforts to design effective lubricants that form films with low friction or wear, thereby resulting in energy savings and longer machine lifetimes, and benefit the United States' economy. In addition, understanding sliding friction poses a unique experimental challenge because the processes occur at an inaccessible, sliding solid-solid interface that cannot be interrogated directly. This means that advances in understanding such interfaces will rely on integrating experiments and theoretical methods carried out on the same systems. Being able to achieve this for the simple systems explored in this proposal will develop the theoretical and experimental strategies for understanding more complex sliding interfaces. Finally, the integrated experimental and theoretical approaches will provide a broad-based education for students and will involve both undergraduates and under-represented minorities. Developments in theoretical methods and the refinement of experimental approaches over the past few decades have resulted in a fundamental shift in the way that science is carried out and will require both graduate and undergraduate education that integrates theory and experiment. This has been emphasized in a recent special issue of Tribology Letters co-edited by the Principal Investigators of this proposal entitled "Progress in Tribology Through Integrated Simulations and Experiments".

这项研究是关于对模型边界膜的能量耗散，界面结构和摩擦的定量理解。 尽管迄今为止的理论方法能够为滑动摩擦提供定性的见解，但它们尚未能够定量描述滑动界面和相关摩擦力的结构。 这项研究的方法是将超高真空中的实验结合到定义明确的模型边界膜上，这些膜由金属底物上的一系列同构碱卤化物组成，并使用从同一系统的密度功能理论计算得出的量身定制的高精度相互作用的分子动力学模拟。 如果成功的话，这项研究的好处将包括了解边界膜的摩擦特性，这些膜是由润滑剂添加剂或气相润滑剂之间在滑动的固相界面上形成的。 这种基本的理解将为设计有效的润滑剂而努力，从而形成摩擦或磨损低的薄膜，从而导致节能和更长的机器寿命，并使美国的经济受益。 此外，理解滑动摩擦会带来独特的实验挑战，因为这些过程发生在无法直接询问的无法访问的，滑动的固体界面。 这意味着理解此类界面的进步将依赖于在同一系统上进行的集成实验和理论方法。 能够为本提案中探索的简单系统实现这一目标将开发理论和实验策略，以理解更复杂的滑动接口。 最后，综合的实验和理论方法将为学生提供广泛的教育，并将涉及本科生和代表性不足的少数群体。 在过去的几十年中，理论方法的发展以及实验方法的完善导致了科学进行的方式的根本转变，并且需要研究理论和实验的研究生和本科教育。 这项提案的主要研究者共同编辑了题为“通过综合模拟和实验中的摩擦学进展”，该提案的主要研究人员共同编辑了摩擦学信件的最新特刊，这一点已得到强调。