摩擦接触化学老化的多物理模型
Multiphysics model of chemical aging in frictional contacts
摘要：
在多个实验中已经报道了由于界面化学键合，在两种固体的静止接触期间静摩擦的增加。然而，这种摩擦老化的物理基础仍然没有完全理解，因为它涉及相互耦合的多种物理和化学效应，使得直接解释实验结果变得困难。在这里，我们开发了一个多物理化学老化模型，结合接触力学，机械化学，和界面化学反应动力学。我们的模型预测，老化是成比例的正常负荷在低负荷政权，并成为非线性在较高的负荷。我们还发现了一个非单调的温度依赖性的老化峰值附近的室温。此外，我们的模拟提供了对整体老化的特定物理/化学效应的贡献的见解。我们的模型与二氧化硅-二氧化硅界面上的单粗糙实验定量一致，并且它为构建具有任意类型的物理和化学效应的其他材料系统的化学老化模型提供了框架。
英文摘要：
An increase of static friction during stationary contacts of two solids due to interfacial chemical bonding has been reported in multiple experiments. However, the physics underlying such frictional aging is still not fully understood because it involves multiple physical and chemical effects coupled with each other, making direct interpretation of experimental results difficult. Here, we develop a multiphysics chemical aging model that combines contact mechanics, mechanochemistry, and interfacial chemical reaction kinetics. Our model predicts that aging is proportional to normal loads in a low-load regime and becomes nonlinear at higher loads. We also discovered a nonmonotonic temperature dependence of aging with a peak near room temperature. In addition, our simulations provide insights into contributions from specific physical/chemical effects on the overall aging. Our model shows quantitative agreement with available single-asperity experiments on silica-silica interfaces, and it provides a framework for building a chemical aging model for other material systems with arbitrary types of physical and chemical effects involved.
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