| In industrial production, the wear can cause serious of engineering/mechanicalsurface damage, wear failure has become one of the three main ways of materialfailures (corrosion, fatigue, wear and tear). According to incomplete estimate thatabout50%or more of the failure was caused by the wear of machine parts, the erosionwear as part of wears leads to device failure and damage in the engineeringapplication, to about8%of the total number. Erosion wear refers to a large number ofsolid particles in a certain speed and angle of attack was carried out on the materialsurface, the process leading to the invalid material loss. Its widely exists in machinery,metallurgy, energy, chemical, aerospace, and many other industrial sectors. Efforts onresearch that how to effectively reduce erosion has long period, cause the extensiveconcern of academic circles at home and abroad, until now it is still a problem to besolved by scholars and important research direction. With the continuous developmentof erosion wear theory, people constantly introducing new methods to improveerosion surface and the erosion environment, make the constant progress of the studyof abrasion and erosion resistance. In this paper, from the fresh viewpoint of bionics,we study the animal’s surface morphology and place it into the application of bionics,design the coupling bionic samples and models, and adopt experimental study and thecombination of theory and numerical simulation, study its erosion resistancemechanism, in order to development and improvement the theory of bionicengineering on the basis of previous studies.This article is mainly composed of the erosion test of coupling bionics samplesunder the erosion tester and the analysis of stress wave propagation theory in solidwith numerical simulation. First of all to use the Laudakin stoliczkana andPhrynocephalus versicolor as organism prototype, through observation and study thescales morphology on the body surface and the structure of the skin tissue, find thatthe excellent performance for erosion resistance of desert lizards’ scales on surfaces isthe consequence of the effect that the coupling the surface morphology, skin structureand materials. By reasonable induction and simplify, extract the characteristics ofmorphology on desert lizards’ dorsal&head scales and “soft”&“hard” layeredstructure on surface skin to establish the coupling bionic model of erosion resistance. In erosion test section, prepare the "hard" in the form of three types of surfacelayer quality and further process into surface morphology and hierarchical structure ofcoupling bionics samples. Experiment optimum design is used to prepare the test plan,choose L9(34) orthogonal experiment design. Examine the particle mesh, impact angleand impact the rhombus, round, square convex hull of three kinds of surfacemorphology three factors on the erosion wear, each factor in three levels, regressionequation is obtained by orthogonal polynomial regression design, and range analysismethod to determine the primary and secondary factors and the optimal level. Forstudying the influence of desert lizard body surface scales on the macro consisting ofgroove shape on abrasion resistance erosion performance, process and prepare thegroove shape on the surface of the bionic samples. Determine grooves and nozzleAngle, groove distance and sample material of three factors three levels, using L9(34)orthogonal experiment design.Numerical simulation Study on erosion wear particle impact mainly focus on thebionic model surface, the sub surface and deep influence. By using the finite elementsoftware Abaqus explicit dynamic analysis of rhombus convex hull, convex hull andthe convex hull of square three kinds of surface morphology of the model, three kindssurface morphology and the "soft"&"hard" double-layer structure coupling bionicmodels and the "cut" out of three coupling bionic model unit was studied bynumerical simulation. Introduce the stress wave propagation in the solid theory;construct a modifiable single particle impact of coupling unit model for numericalsimulation; research the principle of the coupling bionic on erosion by combiningstress wave propagation theory and numerical simulation. The result of simulation isanalyzed based on the experiment optimum design. Using L9(34) orthogonal table,prepare the "hard" layer thickness,"soft" material composition and interface boundingof three factors which influence the axial normal stress amplitude inside the bionicmodel testing scheme and make the range analysis.The thesis is divided into seven chapters: the first chapter is introduction. Thesecond chapter is observation and extraction of biological characteristics of desertlizards dorsal scales and skin structure, establish the coupling bionic model to studythe anti-erosion properties. Three kinds of surface convex hull are prepared by thethird chapter (round, square and rhombus) and bionic sample surface groove, theexperiment optimum design method to design the experiment scheme, make erosion test in the erosion test machine, the test results and analysis using range methodprimary and secondary factors and the optimum level, and obtained the weigh lossand all experimental factors (surface shape, material, impact angle etc.) regressionequation. The fourth chapter establishes the corresponding by particle impact couplingbionic model and unit for numerical calculation and analysis, using the equivalentstress measure the anti-erosion ability of model. The fifth chapter introduced the stresswave propagation in solids theory, elaborated the stress wave collision theory and thetransmission mechanism in the "soft" and "hard" double structure, make introductionon the three kinds of materials failure which caused by the stress wave propagation.The sixth chapter establishes the modifiable numerical model, and combined thestress wave theory to make analysis:"soft" and "hard" layer material, thickness,interface bounding, surface model of plastic, convex hull form factors of stress wavetransmission, the result is directly related to the model of the anti-erosion ability;optimized Design on the basis of numerical simulation, the obtained regressionequation. The seventh chapter is the conclusion and prospect. |
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