Experimental Investigation And Numerical Simulation On Coupling Bionic Functional Surface Of Erosion Resistance

In the national economy and national defense construction, early failure and the discarded of machinery products and parts are caused by abrasion and corrosion, resulting in the dramatical consumption of energy and materials. Abrasion and corrosion of material is an important issue which impacts on the performance, the quality and the life of modem machinery; thus affecting its ability of competing. Erosive abrasion is that the liquid or solid is in a form of small and loose particles impacting on the material surface by certain speed or angle and causing the phenomenon or process of material loss. It exists diffusely in machinery, metallurgy, energy, building materials, aviation, space flight, and many other industrial fields. It has come into one of the important reasons of the material damage or equipment failure.Therefore, the research in materials erosion, the revealling of the mechanism and factors of erosion and the correct choices on material savings are playing a significant role in saving materials, reducing energy consumption and improving economic efficiency. Erosion holds 8% of total destruction of abrasion. So erosion abrasion is leading to more and more extensive academic attention in many scientific fields. But the very important task that we are facing is to find a solution to improve anti-erosion on the surface and decrease erosion wear. The thesis is engaged to study the anti-erosion wear of bionic configuration surface and coupling bionics of flexibility and configuration surface based on bionics view. The scientific value in theory of present investigation exposes the anti-erosion mechanism of coupling bionics of flexibility and configuration surface, perfects and expands the theory and the application of engineering bionics. The researches results of thesis are applied to practice do not decrease erosion of mechanical components, but also play a guiding role for future thorough research.This thesis consists of two parts as a whole. One part is experiment, the other is computer simulation. In the first part of experiment, desert scorption was taken as the research object. The anti-erosion function of desert scorption was research on biological coupling. Erosion resistance of desert scorpion back was a result of multiple coupling effects. The coupling elements significantly influencing the erosion resistance of desert scorpion are configuration, material and flexibility. Three kinds of configuration coupling elements of pit, groove and ring were obtained by the means of research on anti-erosion function of desert scorption. This thesis employed machining technology and manufactured the configuration coupling elements on the metallic material surface. According to the experiment optimized technology, the experimental scheme was arranged. Four experimental factors and three experimental levels were chosen. Experimental target is the erosion ratio. Contrast tests of anti-erosion of conave, groove and ring were carried out. Analysis of the anti-erosion influence law of different morphology surface of metallic material. The anti-erosion mechanisms of bionics configuration were revealed. It was shown in the experimental results that different bionic configuration increased the anti-erosion ability of material surfaces, and in this experiment the best anti-erosion configuration is ring. Based on erosion experimental research of configuration coupling elements.The coupling specimens with diferent groove surface configuration were manufactured by FDM-Dimension rapid prototyping. Biology flexibility was achieved by means of silica. Anti-erosion experiments of coupling samples were carried out. And contrast tests were carried out at the best and worst test points of erosion resistance for three samples of groove, smooth and flexibility, smooth.The thesis utilized the nonlinear finite element to analyze erosion of three dimensional bionics configuration surfaces and coupling samples of flexibility and configuration surface. The method can not only provide physical parameters that can't be measured by common means, but also modify the parameters of structure and movement conveniently. The method was very important to shorten development period of new products and reduce the cost. In the process of three dimensional simulations, equivalent stresses were compared with different bionic configuration surfaces and coupling samples of flexibility and three kinds of different groove spacing in details. At the same time, the equivalent stress charts about three kinds of configuration surfaces and coupling samples of flexibility and three kinds of different groove spacing in different time were drawn. The thesis got mechanic characteristics of the erosion abrasion process by using the software ANSYS/LS-DYNA, such as equivalent stress.It was very useful to probe the process and the mechanism of erosion-wear and erosion forecasting. This research has important reference value to study other coupling of bionics and the effect of anti-erosion material surface. This thesis includes eight chapters. Chapter 1 was introduction, which mainly introduced the development history and the current research situation of material erosion, and explained the aim and the significance of this research work. Chapter 2 was erosion resistance feature extraction of desert scorption and erosion resistance model building of coupling bionics. Chapter 3 the experiment sheme was arranged and erosion tests of ring, groove and pit bionic configuration surface were carried out. Regression orthogonal experiment was carried out to select the optimal erosion resistance condition with respect to the ring bionic surface configuration. Regression equations between erosive rate and experimental factors of ring surface configurations were obtained. Chapter 4 anti-erosion experimental research of binary couping of flexibility and configuration. Multi factor line regression method was carried out for deal with experimental data. Regression equations between erosive rate and experimental factors of coupling samples were obtained. Chapter 5 effect factors and mechanisms of erosion were discussed in detail. Chapter 6 simulated erosion process of pit, groove, and ring bionic configuration surface and coupling sample of flexibility and configuration surface by three dimensional finite element methods, and drew equivalent stress charts along with time according to the result of simulation. Chapter 7 was the gas/solid mixture numerical simulation of erosion by FLUENT. Chapter 8 was conclusions.