"Sliding Friction Between Amorphous Cotton Fiber and Chromium Surfaces: a Molecular Dynamics Study "

Abstract

"It is challenging to experimentally determine the micro-friction mechanism of cotton fiber and metal in the sliding process. The influence of load and temperature on the interface behavior during dry friction between amorphous cotton fiber and chromium, the contact interface evolution and friction coefficient are studied using reactive molecular dynamics. The simulation results show that chromium–oxygen bonds are formed on the contact interface of the friction system during the sliding process. Furthermore, the relationship between friction coefficient, temperature, and load varies with the mechanical state of cotton cellulose. The relationship is positive when the cotton cellulose is in the glassy state. However, when cotton cellulose is in a highly elastic state, its friction coefficient is negatively related to the load. This study systematically evaluated the effects of temperature and load on the slip process from the atomic scale, provided a reason for the wear of the hard materials of the friction pair, and provided theoretical support for the study of this type of friction mechanism."

A molecular dynamics study on water lubrication of amorphous cotton fiber sliding against chromium

“…All the simulations were done by the large-scale atomic/molecular massively parallel simulator (LAMMPS) which is an open-source coding for MD simulation [53]. The interactions among atoms are evaluated by the reactive force field (ReaxFF) developed by Shin et al [54] which is agreement with YanZhe et al [5,6] investigated the dry friction between Cr and cotton fiber. The ReaxFF allows for bonds to break and form during the simulation and the connectivity is determined by bond orders calculated from interatomic distances.…”

“…After a period of friction between Cr and ACF, the chemical changes take place at the contact surfaces which is generated by oxygen atoms in the ACF and Cr atoms produce Cr=O bonds to produce Cr 2 O 3 and induce to the damage to Cr [5]. The Cr=O bonds are manifestations of damage on the surface of Cr substrates, so the number of Cr=O bonds was calculated to analyze the damage to Cr during friction process.…”

“…With the growth of the global population, the demand for cotton is increasing and it has become white gold [2]. However, in the process of picking to making textiles, there will be friction with machine parts of different materials, and these frictions will lead to wear and damage to machine parts [3][4][5][6]. Improving the wear resistance of surface is an important way to extend the service life of parts, the chromium (Cr) is often used as a surface coating material for metal parts because of its high hardness, heat resistance, wear resistance and strength [7].…”

“…In addition, many researches have conducted to investigate the properties of cellulose via MD simulation [26][27][28][29][30][31][32][33][34][35][36], which is helpful in further understanding the cellulose characteristics. YanZhe et al [5,6] studied the dry friction between cellulose and Cr and the results showed that serious damage to Cr due to the friction force and the coefficient of friction (COF) are too large. Both of the friction force and COF needed to be greatly reduced to protect Cr and prolong its service life, an effective way is using the lubricants, such as oil, water, ionic liquids and other aqueous lubricants [37][38][39].…”

Friction Properties of Crystalline Cellulose Sliding on Chromium under Water Lubrication Based on Molecular Dynamics Simulations

“…The study is to investigate the friction and wear of crystalline cellulose and Cr using water as a lubricant by MD simulations, considering the factors of loading ( F n ) and sliding velocity ( v x ). However, using a smooth surface ,, is imperfect because it is almost non-existent in the real world. A rough surface of Cr was used in this study, which can lead to more serious friction and wear of cellulose and Cr but is closer to the real friction compared to a smooth surface.…”