Experimental Research And Simulation Analysis On Erosion Resistance Of Bionic Layer Structure

Wear failure is main failure mode of the device in engineering applications, andthe failure caused by the erosion wear accounted for a large proportion. Bionics is agradually mature discipline, through the study of biological structural characteristics,biological character, behavior, function, principle and interaction, select advantages toimitate and apply to the engineering to optimize the performance of the device and themachine. This article will improve erosion resistance of materials through bionics.In the modern engineering applications, the requirement of the material erosionresistance is higher and higher, how to improve it under the premise of guaranteeengineering require become an important research direction. Lizards can live in thedesert where the sand impact is extremely serious. It illustrates the epidermal layerstructures have excellent resistance to erosion. This article select the lizards in thedesert as bionic object, according to the existing research results, do more furtherresearch on head and back skin structure of lizard and the erosion resistancemechanism of the epidermal layer structures.First of all, make demonstration for the research significance of this article.Combining with the related erosion wear theory to research erosion wear mechanismafter the deformation occurred on surface of the target body. It proves that thedeformation has a great influence on erosion wear. In engineering applications, whensolid particles impact ductile materials, no matter the angle is big or small, thedeformation will increase the rate of erosion wear, the greater the strain, the moreserious the erosion wear.Secondly, to research dynamic characteristics of the layer structure through thebasic theory of stress wave. By formula, when the stress wave spreads from thematerials with bigger wave impedance to the other materials produce reflectionunloading; and when the stress wave spreads in the opposite direction will producereflection loading, lead to transmission is stronger than the incident. Through theanalysis of stress wave in collision bionic structure can effectively reduce the damage.The conclusions prove that the bionic structure is excellent in dynamic performance.Thirdly, the impact experiment for getting strain was carried out according to theresearch direction. Do some analysis of stress and strain and contrast the performanceof different structures. Using DH-5923(4CH) as dynamic signal testing instrument for collecting data and the DHDAS (5923-1394) as strain signal analysis system foranalysis. Using304stainless steel and pure copper as the target body, using pendulumhammer hits different bionic layer structures of90°. Test is divided into the singlefactor experiment, multi-factor orthogonal experiment and three layers structurecontrast test: the first experiment obtain the conclusion that the optimal structure is304stainless steel/silica gel and erosion resistance is related to wave impedance ratio oftwo materials; the second experiment do analysis of the target material, layer number,impact velocity and soft material factors. Using SPSS to analyze the variance andaverage and it is concluded that the target material had the greatest influence onerosion resistance, followed by after impact velocity, soft material and structure layer;and it is concluded that when the target material is304stainless steel, the structure isthree layers, impact speed of V2and soft material for silica gel the erosion resistance isbest; the third experiment make analysis about the different wave impedance of thebottom hard layer affect the performance of erosion resistance, the conclusion is thatwhen the wave impedance is bigger than the target material the structure is better.Finally, using the software ABAQUS to calculate the stress and strain of the layerstructure knocked by single particle. In this part, we get the same conclusions with theexperiments through the analysis of the simulation data, so make the experimentconclusions is more accurate.Based on the theory, experiment and simulation analysis of detailed studies havebeen carried out to verify the bionic structure, obtain some related conclusions. Theresearch contents and methods provide a strong basis for the bionic structure in thematerial resistance to erosion and the resistance to collision.