Design of Optimized Convex Pattern Surface for Wear Tests in A Test Rig

Using bionic surface on the material equipment interface of bulk handling equipment is a promising solution for abrasive wear reduction. A bionic surface is a flat surface outfitted with a pattern of convexes that disrupt the natural sliding flow of bulk material. Previous numerical work has shown a significant wear reduction of bionic surfaces compared to a smooth surface and revealed the effect degrees of geometric parameters and the interactions between them.
The aim of this paper is to design samples with an optimal convex pattern for steel plates of 100 mm by 100 mm to verify the simulation results in a test rig for industrial scale experiments in Newcastle, Australia. In order to find an optimal convex pattern, a stepwise optimization, one-factor-at-a-time, is performed by optimizing four parameters of convex patterns. The geometric convex patterns were evaluated with the aid of Discrete Element Method (DEM). The simulated material was iron ore with d50 of 4.6 mm sliding down a smooth chute transitioning into bionic surfaces of different geometric configurations. Hertz-Mindlin (no slip) model with the Archard wear model were implemented to calculate the sliding wear volume.
Considering the direct relation between the dimensions of convexes and the sizes of particles, the ratios of a0, b0, c0 and d0 to d50 were used for analysis simulation results. The results show that a chute surface with circular convexes with a radius of 6 mm (a0:d50=1.3), spaced 25 mm apart in both horizontal and vertical directions (c0:d50=5.4), is optimal in reducing wear. This sample configuration and smooth surface will be tested to verify the predictability of the simulation approach.