在稳定滑动时接触软表面的动力力测量:固定深度的梯形学
Cheng-En Tsai1,2,3, Jih-Chiang Jc Tsai2
1Department of Physics, <a href="https://ror.org/05bqach95">National Taiwan University</a>, Taipei 10617, Taiwan.
Physical review. E
|July 18, 2024
概括
表面之间的摩擦会影响机械系统. 这项研究揭示了摩擦力非单调地取决于滑动速度,表现出明显的动态模式和棒滑模式,这对于理解颗粒流动至关重要.
科学领域:
- 部落学 (tribology) 是一个学科.
- 软物质物理学 软物质物理学
- 颗粒力学 颗粒力学
背景情况:
- 表面相互作用,或三角学,显著影响机械系统的行为,包括颗粒颗粒的粒子流.
- 了解粒子间力量是模拟复杂颗粒动态的关键.
研究的目的:
- 为了实验性地研究不同滑动速度的聚二甲基 (PDMS) 表面之间的三极力.
- 描述表面摩擦中的动态模式和粘滑现象.
- 为了将粒子间的三角学与宏观颗粒流连接起来.
主要方法:
- 在被浸入流体中的半圆柱形PDMS滑动样本之间测量接触力和正常力.
- 在一系列的滑动速度 (四十年) 进行的实验.
- 用固定的深度设置进行重复的实验,以观察力波动和棒滑模式.
主要成果:
- 时间平均摩擦力表现出对滑动速度的非单调依赖,与斯特里贝克图对齐.
- 确定了三种不同的动态模式,其中一种显示出强烈的stick-slip模式.
- 随着时间的推移,stick-slip的发病速度和位置发生了变化,表明了表面的变化.
- 球体样本实验证实了与颗粒流的直接联系.
结论:
- PDMS表面之间的摩擦动态复杂且取决于速度,表现出特征性模式.
- 粘滑行为是某些摩擦模式的关键特征,受表面演变的影响.
- 这项研究提供了与颗粒流相关的粒子间 Tribology 的基本见解.
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