Experimental Research On Sliding Anti-wear Ability Of The Bionic Non-smooth Surface And Numerical Simulation

About 1/3 consumption of the energy is caused by friction and abrasion. Abrasion isone of the three kinds of main reasons (abrasion, corrosion, fatigue) of invalidation ofmaterial and mechanical parts. Abrasion not only consumes the energy and materials anddecreases the equipment efficiency, but also accelerates the equipments discard andcauses the parts replacement frequently and huge economy loss. There are many problemsof tribology in agricultural machinery. Therefore, the principal request of the high efficiencyand steady-going run of agricultural machinery is to decrease the friction and the wastage ofagricultural machinery and increase the anti-wear ability. So abrasion is leading to moreand more extensive academic attention in many scientific fields. But the veryimportant task that we are facing is to find a solution to make the friction and thewastage of agricultural machinery decrease and make the anti-wear ability increase. Thethesis is engaged to study the anti-wear of bionics non-smooth surface, then designa kind of bionics wear-resistant morphology for the metallic material surface. Thepresent investigation exposes the anti-wear mechanism of the bionics non-smoothsurface shape, perfects and expands the theory and the application of engineeringbionics, and lays the theory foundation on practical application of new functionsurface.This thesis consists of two parts as a whole. One part is experiments, the otheris computer simulation. The testing object is a kind of concave bionic non-smoothmorphology in the experiments. This thesis employed laser re-melting and hardeningtechnology and manufactured the bionic non-smoothness on the metallic materialsurface. The technology can make the local area of the parts entirely differ from thematrix material, which can make the surface get higher anti-wear, fatigue intensityand anti-corrosion. According to experiment optimized technology experimentscheme was arranged. Considering the actual living creatures' morphology and thescientific research results of our lab, two experimental factors and threeexperimental levels were chosen. Experimental target is the abrasion value. It wasshown in the experimental results that the bionic non-smooth morphology increasedthe anti-wear ability of material surfaces, and the anti-wear ability reached themaximum value when diameter was 250 micron and space was 350 micron.The thesis utilized the nonlinear finite element to analyze sliding abrasion oftwo and three dimensional material surfaces. The method can not only providephysical parameters that can't be measured by common means, but also modify theparameters of structure and movement conveniently. The method was very importantto shorten development period of new products and reduce the cost. The results oftwo dimensional simulation show that the equivalent stress, contact friction stressand contact pressure of bionic non-smooth surfaces were all smaller than that ofsmooth surfaces. The thesis got some mechanics characters of the abrasion processby using the software ANSYS, such as equivalent stress, contact friction stress,contact pressure, etc. It was very useful to probe the process and the mechanism ofsliding-wear and alleviate the material wear. This research has important practicalvalue to apply bionic non-smooth surface to machine parts, such as the parts of...