Coarse-grained model for spring friction study of micron-scale iron by smoothed particle hydrodynamics

TL;DR

This study develops a coarse-grained smoothed particle hydrodynamics model to analyze dry sliding friction of micron-scale bcc iron, revealing the influence of spring force anisotropy and load on friction behavior.

Contribution

It introduces a novel coarse-grained SPH model for micron-scale iron friction, highlighting the effects of spring force anisotropy and load on friction characteristics.

Findings

Anisotropic spring force results in better friction performance.

Coarse-grained model effectively captures stick-slip motion.

Friction coefficient depends on spring force isotropy and normal load.

Abstract

The paper constructs a coarse-grained model to investigate dry sliding friction of the body-centered-cubic Fe micron-scale system by smoothed particle hydrodynamics simulations and examines influences of the spring force on the characters of friction. The N_atom = 864 \times 10^12 atoms Fe system is coarse-grained into the two different simple-cubic particle systems, one of 432000 and the other of 16000 particles. From the detection of stick-slip motion, friction coefficient, dependence of friction coefficient on isotropy or anisotropy of the spring force and externally applied normal load, we find that the coarse-grained model is a reasonable modeling process for study of friction of the Fe system and the anisotropic behavior presents better friction of the system than the isotropic one.