软界面处的瞬态流体去除：平面接触中固定挤压出和动态刮擦
Transient fluid removal at soft interfaces: Stationary squeeze-out and dynamic scraping in a block-on-flat contact
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中文总结 AI 辅助
研究矩形橡胶块在不同润滑表面滑动时的瞬态摩擦，通过不同块状配置及等待时间实验，发现不同流体的去除方式，如甘油兼具固定挤压和滑动诱导去除，泥浆和油脂以滑动诱导刮擦为主，还给出加速流体去除方法及设计指导。
中文摘要 AI 辅助
从橡胶与基材的界面去除流体对于在受污染表面行走和车辆制动时保持摩擦力至关重要。我们研究了矩形橡胶块在用水、甘油、泥浆或硅脂润滑的瓷砖和玻璃表面上滑动时的瞬态摩擦。测试了在不同静止等待时间后，两种在滑动方向上具有不同长度的块状配置。对于水，在滑动开始前固定挤压几乎完成。对于甘油，固定挤压和滑动诱导的流体去除都很重要。对于泥浆和油脂，在滑动距离达到块长度量级后达到稳定滑动状态，对先前等待时间依赖性小，表明滑动诱导的刮擦主导高粘性物质的流体去除。将接触分成较短块通过减小排水距离和增加前缘数量加速流体去除。基于测量表面粗糙度的固定挤压计算与甘油实验相当吻合。结果为具有多尺度排水通道和足够柔韧性以促进瞬态流体去除的橡胶胎面块提供了设计指导。
英文摘要
Fluid removal from rubber-substrate interfaces is crucial for maintaining friction during walking and vehicle braking on contaminated surfaces. We study the transient friction of rectangular rubber blocks sliding against tile and glass surfaces lubricated with water, glycerol, mud, or silicone grease. Two block configurations with different lengths in the sliding direction were tested after different stationary waiting times. For water, stationary squeeze-out is nearly complete before sliding begins. For glycerol, both stationary squeeze-out and sliding-induced fluid removal are important. For mud and grease, the steady-sliding state is reached after a sliding distance of the order of the block length, with little dependence on the preceding waiting time, showing that sliding-induced scraping dominates fluid removal for highly viscous substances. Dividing the contact into shorter blocks accelerates fluid removal by reducing the drainage distance and increasing the number of leading edges. Stationary squeeze-out calculations based on the measured surface roughness are in reasonably good agreement with the glycerol experiments. The results provide design guidelines for rubber tread blocks with multiscale drainage channels and sufficient compliance to promote transient fluid removal.
