The mechanism of stick-slip phenomenon during friction process at low temperature environment

Shiren La,Cong Liu,Xingyi Zhang

doi:10.1063/1.5109474

Abstract

When a material is immersed in a low-temperature medium, e.g., liquid nitrogen, its Young’s modulus and surface roughness will change as the temperature of the material decreases as a result of different friction behaviors. In this study, a high-precision friction test device was constructed to perform a detailed comparative study on the friction properties of a pure copper strand immersed in liquid nitrogen, air, and water. The force and displacement resolutions of the experimental system were as high as 0.01mN and 0.03μm, respectively. It was found that the stick-slip phenomenon in the liquid nitrogen was significant, while the slope of the stick-slip was larger than those observed in the air and water media. These experimental results were simulated using a spring-slider model that considered the influence of hydrophilicity on surface roughness. The roughness was shown to change the amplitude of the friction curve with time, while the slope of the stick-slip was dominated by the modulus’ magnitude variety.

Highlights

Friction is one of complex natural phenomena that involves many service variables including counterpart, pressure, temperature, surface finish, lubrication, etc.1 Among these factors, temperature plays an important role, especially the low temperature condition, which often changes the material’s surface roughness and modulus, affecting the friction properties of this material
In this work, the experiment of stick-slip during friction process of Cu material in liquid nitrogen is presented, and the mechanism of it is revealed by using a numerical model
This indicates that the oxidation properties of the copper material under short-term laboratory exposure conditions are negligible during the friction process

Summary

INTRODUCTION

Friction is one of complex natural phenomena that involves many service variables including counterpart, pressure, temperature, surface finish, lubrication, etc. Among these factors, temperature plays an important role, especially the low temperature condition, which often changes the material’s surface roughness and modulus, affecting the friction properties of this material. Friction is one of complex natural phenomena that involves many service variables including counterpart, pressure, temperature, surface finish, lubrication, etc.. Friction is one of complex natural phenomena that involves many service variables including counterpart, pressure, temperature, surface finish, lubrication, etc.1 Among these factors, temperature plays an important role, especially the low temperature condition, which often changes the material’s surface roughness and modulus, affecting the friction properties of this material. Experimental studies have been performed on the low-temperature friction properties of ceramics, metal, fiber and polymer material.. Many materials exhibit significant stick-slip phenomenon during their friction process at low temperature environment, but not obvious at room temperature. In this work, the experiment of stick-slip during friction process of Cu material in liquid nitrogen is presented, and the mechanism of it is revealed by using a numerical model

EXPERIMENTAL DEVICE

Experimental studies on the stick-slip slope in different media

Computational analysis of the stick-slip slope

CONCLUSIONS