Influence of Convex Hull Density on Friction Contact of Bionic Surface
In order to study the influence of convex hull density on friction contact of bionic surface, we observed the 3-D structure of locust, tree frog and grasshopper with the 3-D microscope system, the experiments show that there convex hulls(diameters are 4um-6um)on the unsmoothed surface of feet pads; based on that structure the paper designs four kinds of unsmoothed bionic surfaces with different densities(center distances are 2R, 3R, 4R and 5R), the four contact models built by ANSYS are solved at the same loads and constraint condition, results indicate that the elastic deformation on top surface of convex hull is minimum (about 1.000mm) and the maximum (2.135 mm) appears on the midpoint of neighboring convex hulls, and the elastic deformation would increase with the decreasing of convex hulls’ density, big and small density would decrease the contact pressure also. We conclude bionic unsmoothed surface with appropriate density would put up satisfying contact performances and the surface3（center distances is 4R）we designed provides a good reference for bionic surface design and fabricating.
L. J. Xiao and L. F. Zhuang, "Influence of Convex Hull Density on Friction Contact of Bionic Surface", Advanced Materials Research, Vols. 308-310, pp. 483-489, 2011