Free Abrasive Wear Behavior Of Hte Biomimetic Non-smooth Surfaces With Convex Domes

The phenomena of free abrasive wear widely occur in the working components of agricultural machines, earthmoving machines, coal-mining machines, construction machines and others. Free abrasive wear is one of the reasons resulting in failure of the components of those machines. The abrasive wear of the soil-engaging components of agricultural machines against soil is a typical free abrasive example.Ones pay more attention to the materials of these components in order to improve their anti-abrasive resistance, such as the development of varied kinds of anti-abrasive materials in the specific wear environment and service surroundings. The development of the abrasive wear resistance materials has played an important role in increasing the abrasive wear resistance of many working parts or components. But, there existed some disadvantagements and limits from anti-wear materials. It was demonstrated that cuticles of some animals such as dung beetle and ground beetle, display the varied non-smooth or textured morphologies, For examples, the convex domes, dimpled or scaly form morphologies. The formation of these non-smooth morphologies is not only related to their inherit, but directly to the surroundings they survive. The morphologies are the results of the optimization for survival of the animals. which gives a new clue for engineer to find answers to some engineering problems. It was shown that the non-smooth or textured morphologies possess high anti-adhesion and anti-resistance properties. This thesis reported the research work of the free abrasive wear behavior of the biomimetic convex non-smooth surfaces. Seven kinds of biomimetic surfaces with convex domes were designed. Phenolic resin (50%wt) composite reinforced with lightweight calcium carbonate (50%wt) were selected for preparing convex texture. The convex non-smooth surfaces were formed by gluing convex domes on the 45 steel plate.One method to measure the wear volume of the convex non-smooth surfaces was worked out. In this method, a 3D laser scanning system LSV50, a reverse engineering software and a 3D style software (Pro/E2001) were used. The results showed that this method is feasible and the repeatability of this method for wear volume measured is satisfactory. The free abrasive wear properties of the biomimetic convex non-smooth surfaces were examined on JMM type free abrasive wear tester. the behavior in different arrangements and dimensions of the convex domes and the test conditions were examined. The results showed that the arrangements of the convex domes are crucial for free abrasive wear behavior. The anti-abrasion resistance of the surfaces with steel convex domes is lower than that without steel convex domes. For the effects of test conditions, the volume wear value increased with the sliding velocity and the abrasive grain size except for the sliding velocity of 1.68 m/s and 3.02 m/s. during this two velocities the volume wear value decreased with the grain size of the abrasive increased to 0.420-0.840mm.The wear morphology of the biomimetic convex surfaces was described by Near Middle Line (NML), which is generated by reverse engineering software, 3D style software and statistical analysis software. The results showed that the area of variation NML changed became more narrow as the grain size was increased.The wear volume value is linear to the sliding distance for the convex non-smooth in free abrasive wear. The free-abrasive wear property was a function of the sliding velocity and the grain size of the abrasive material. The regression results showed that the factors affecting volume wear heavily including sliding velocity and grain size.The free-abrasive material used was simplified as Bingham model. The parameters of the model was determined. The movement of the abrasive material on the biomimetic convex non-smooth surfaces was analyzed by finite element method. The movement state of the abrasive material on the single convex dome was simulated using ANSYS software. The result showed that convex surface is tend to possess...