Contact electrification (CE) is a universal phenomenon that occurs at the contact interface where tribo-charges transfer from one surface to another. These CE-driven charges accumulate at the interface and can significantly affect the soft adhesive contact. So far, only a few analytical and numerical models have been proposed to partially solve the CE-induced electroadhesive contact problem. In this study, we have developed a full self-consistent contact model to study the CE-induced electroadhesion between a dielectric elastic axisymmetric parabolic surface and a dielectric rigid flat. Both surfaces are initially neutralized and undergo only one loading–unloading cycle. The surface interaction is determined by both the Lennard-Jones and the electrostatic interaction laws. The electrostatic problem is numerically solved to accurately calculate the electrostatic traction due to both the tribo-charges and bound charges. The normal traction, interfacial gap, and hysteresis loop of the force curve are thoroughly investigated. The effect of non-uniform tribo-charge density on the force curve and electrostatic traction is explored. The numerical model developed in the present work can serve as the foundation for more complex electroadhesive contact models. It also sheds light on the interfacial design of CE-related devices, e.g., contact-separation triboelectric nanogenerator.

中文翻译：

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接触带电的粘附模型

接触起电 (CE) 是一种普遍现象，发生在接触界面处，摩擦电荷从一个表面转移到另一个表面。这些 CE 驱动的电荷在界面处积聚，可显着影响软胶接触。到目前为止，仅提出了一些分析和数值模型来部分解决CE引起的电粘附接触问题。在这项研究中，我们开发了一个完全自洽的接触模型来研究介电弹性轴对称抛物线表面和介电刚性平面之间的CE引起的电粘附。两个表面最初都被中和，并且仅经历一次加载-卸载循环。表面相互作用由伦纳德-琼斯定律和静电相互作用定律决定。对静电问题进行数值求解，以准确计算由于摩擦电荷和束缚电荷而产生的静电牵引力。彻底研究了力曲线的法向牵引力、界面间隙和磁滞回线。探讨了不均匀摩擦电荷密度对力曲线和静电牵引力的影响。目前工作中开发的数值模型可以作为更复杂的电粘附接触模型的基础。它还揭示了 CE 相关器件的界面设计，例如接触分离摩擦纳米发电机。