Investigation On Gas-solid Erosion Wear On Bionic Configuration Surface

In the national economy and national defense construction, early failure and thediscarded of machinery products and parts are caused by abrasion and corrosion, resulting inthe dramatical consumption of energy and materials. Abrasion and corrosion of material isan important issue which impacts on the performance, the quality and the life of modernmachinery; thus affecting its ability of competing. Erosive abrasion is that the liquid or solidis in a form of small and loose particles impacting on the material surface by certain speed orangle and causing the phenomenon or process of material loss. It exists diffusely inmachinery, metallurgy, energy, building materials, aviation, space flight, and many otherindustrial fields. It has come into one of the important reasons of the material damage orequipment failure.Therefore, the research in materials erosion, the revealling of themechanism and factors of erosion and the correct choices on material savings are playing asignificant role in saving materials, reducing energy consumption and improving economicefficiency.Erosion is the abrasion which caused by the impact of multiphase flow media onthe material surface, it holds 8% of total destruction of abrasion. So erosion abrasion isleading to more and more extensive academic attention in many scientific fields. Butthe very important task that we are fac ing is to find a solution to improveanti-erosion on the surface of metallic material and decrease erosion wear. Thethesis is engaged to study the anti -erosion wear of bionic configuration surface,then design a kind of bionic erosion-resistant configuration for the metallic materialsurface. The present investigation exposes the anti -erosion mechanism of the bionicconfiguration surface shape, perfects and expands the theory and the application ofengineering bionics, and lays the theoretical foundation on practical application of new functional surface.This thesis consists of two parts as a whole. One part is experiments, the otheris computer simulation. The testing objects are several samples with concave, fluteand traffic circle bionic configuration in the experiments. This thesis employedmachining technology and manufactured the bionic configuration on the metallicmaterial surface. According to the experiment optimized technology, theexperimental scheme was arranged. Considering the actual living creatures'morphology and the scientific research results of our lab, four experimental factorsand three experimental levels were ch osen. Experimental target is the erosion ratio.It was shown in the experimental results that different bionic configurationincreased the anti-erosion ability of material surfaces, and in this experiment thebest anti-erosion configuration is concave.The thesis utilized the nonlinear finite element to analyze erosion 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 veryimportant to shorten development period of new products and reduce the cost. Theresults of two dimensional simulation shows that the equivalent stresses of severalbionic configuration surfaces were all smaller than that of smooth surfaces. In theprocess of three dimensional simulation, equivalent stresses were compared withdifferent bionic configuration surface and smooth surface in details.At the sametime, the equivalent stress charts about four kinds of surface modality in differenttime were drawn.The thesis got mechanic characteristics of the erosion abrasionprocess by using the software ANSYS/LS-DYNA, such as equivalent stress .It wasvery useful to probe the process and the mechanism of erosion-wear and erosion forecasting. This research has important reference value to study other bionicmodality and the effect of anti -erosion material surface.This thesis includes seven chapters. Chapter 1 was introduction, which mainlyintroduced the development history and the current research situation of materialerosion and the method of bionics in this area, and explain ed the aim and thesignificance of this research work. Chapter 2 introduced realization of bionicconfiguration surface, and how to choose the best parameter of configuration andthe process of trial. Chapter 3 described the experiments on anti -erosion ability ofbionic configuration surface, studied the mechanism of anti-erosion ability ofbionic configuration surface. Chapter 4 studied the general concept and techniqueof erosion-wear by finite element software ANSYS /LS-DYNA. Chapter 5simulated erosion-wear process of concave, flute, and traffic circle bionicconfiguration surface by two dimensional finite element method s, and analyzed theequivalent stress field. Chapter 6 simulated erosion-wear process of concave, flute,and traffic circle bionic configuration surface by three dimensional finite elementmethods, and drew equivalent stress charts along with time according to the resultof simulation. Chapter 7 was conclusions.