Abstract
This study aims to clarify the cause of the friction when the ball array slides on a plane including its directionality. A physical model was constructed to explain the friction based on ratchet theory. To verify the anisotropy, the sample was a line-and-space structure, of which length was 40 mm and spacing between arrays was 20 mm. Also, in the way of that curvature radius of microspheres was 0.3-10 mm and load was 1-10 N, it compared the experimental values and simulation that the impact curvature radius and load on friction coefficient. It was found that the experimental results are well correlated with simulation except extremely lower contact pressure.
