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Thermal activation of dry sliding friction at the nano-scaleстатья
- Авторы: Kheiri Rasoul, Tsukanov Alexey A.
- Сборник: PHYSICAL MESOMECHANICS OF CONDENSED MATTER: Physical Principles of Multiscale Structure Formation and the Mechanisms of Nonlinear Behavior: MESO2022
- Год издания: 2023
- Место издания: AIP Publishing
- DOI: 10.1063/5.0163220
- Аннотация: Molecular dynamic (MD) simulations are applied to investigate the dependency of the kinetic friction coefficient on the temperature at the nano-scale. The system is comprised of an aluminum spherical particle consisting of 32000 atoms in an FCC lattice sliding on a stack of several layers of graphene, and the simulations have done using LAMMPS. The interaction potential is charge-optimized many-body (COMB3) potential and a Langevin thermostat keep the system at a nearly constant temperature. With an assumption of linear viscous friction, Ffr = -γν, the kinetic friction coefficient γ is derived and plotted at different temperatures in the interval of T ∈ [1, 600] K. As a result, by increasing temperature, the kinetic friction coefficient is decreased. Consequently, while the friction is assumed as a linear viscous model, the results are similar to the thermal activation in atomic-scale friction. That is, (1) by increasing sliding velocity friction force will be increased and (2) by increasing temperature, kinetic friction coefficient decreases.
- Добавил в систему: Цуканов Алексей Алексеевич