Friction of the micron-scale silica under various behaviors of the shape and the orientation of the coarse-grained particle in adaptive smoothed particle hydrodynamics

The paper investigates dry sliding friction of the coarse-grained micronscale {\alpha}-SiO2 oxide. Adaptive smoothed particle approach is used to consider various shapes and orientations of the particles. It is found that because of the stable system the friction characteristics almost do not depend on the shape and the orientation of the particle. The friction coefficient of 0.1376 observed in the present work is in accordance with that found in previously experimental reports. The friction coefficient steady maintains in the applied load range of 5-80 {\mu}N, showing a very slightly linear drop from 0.1379 to 0.1341 in this load range. This observation is also consistent with the applied load-friction coefficient relationship mentioned in previously experimental studies.