Friction from Atomic to Tectonic Scales

9813752卡尔森该奖项支持摩擦学的教育和理论研究。Carlson建议继续她的工作，集中在三个领域：(1)从实验数据和微观模型推导唯象摩擦定律，(2)可以探索不同耗散机制的界面的微观模型研究，以及(3)摩擦模型在地震学和工程中的应用。其中第一部分继续发展了PI提出的边界润滑的速率和状态摩擦定律，并将研究扩展到更广泛的适用于颗粒材料、聚合物、吸附润滑剂、泡沫、乳状液和粗糙润滑界面的速率模型。第二个问题涉及多自由度界面滑动模型的研究。特别重要的是从原子论或连续体模型中识别宏观规律，并更好地理解合作效应的起源和波动的重要性。最后一个领域涉及摩擦模型在工程系统和地震学中的应用。这项研究的重点是阐明摩擦规律的变化如何影响地震观测数据，如传播速度、上升时间等。该奖项支持关于摩擦和磨损及其微观起源的教育和基础研究。这项研究的性质是跨学科的，适用于各种条件下的各种力学界面，包括泡沫和聚合物润滑的界面，以及地质断层处的界面。在后一种情况下，计算机模拟被用来解释来自特定地震事件的数据。

9813752CarlsonThis award supports education and theoretical research in tribology. Carlson proposes to continue her work focussing on three areas: (1) derivations of phenomenological friction laws from experimental data and microscopic models, (2) studies of microscopic models of interfaces in which different dissipation mechanisms can be explored, and (3) applications of friction models in seismology and engineering. The first of these continues development of the PI's proposed rate and state friction law for boundary lubrication and extends the study to a broader class of rate models applicable to granular materials, polymers, adsorbed lubricants, foams, emulsions, and rough lubricated interfaces. The second of these involves the study of many degree of freedom models for interface sliding. Of particular importance are the identification of macroscopic laws from atomistic or continuum models and to better understand the origins of cooperative effects and the importance of fluctuations. The last area involves applications of friction models in engineering systems and seismology. A focus of this research is to elucidate how variations in the friction law affect seismological observables, such as propagation speed, rise time, etc. %%%This award supports education and fundamental research on friction and wear, and their microscopic origins. The nature of the research is interdisciplinary and applicable to a wide range of mechanical interfaces under various conditions, including interfaces lubricated by foams and polymers, and the interfaces at geological faults. In the latter case, computer simulations are used to interpret data from specific earthquake events.***