Research On Coupling Bionic Wearability Of Biological Flexibility And Surface Morphology

As one of the three kinds of main reasons (abrasion, corrosion, fatigue) of invalidation of material and mechanical parts, abrasion is the migration phenomenon of surface material between two contact surfaces when they has relative motion and under certain load. The surface material is consumed constantly, until the mechanical parts to work finally. In the national economy and defense construction, equipment efficiency decreased because the consuming of energy and materials caused by abrasion, and the equipments was discarded and parts were replaced frequently and huge economy was lost. In many fields, more and more academic attentions were focused on the abrasion. It's one of the significant technology problems which expected to be solved in a long time.In this thesis, the anti-wear bionic coupling surface of the biological flexibility and surface morphology was studied. Then flexibility and surface morphology coupling bionic parts were designed for the wear test in order to obtain a good effect on anti-wear. This investigation exposes the anti-wear mechanism of the bionic coupling surface of biological flexibility and surface morphology, and expands the theory and application of engineering bionic, which has a deeply guiding function for the further research.This thesis consists of three parts: Part 1, analysis on the anti-wear characteristics of biological prototype. Part 2 is experiment of anti-wear. Part 3 is computer simulation. In Part 1, the wearability of the single element of biological prototype was analyzed reference to some current studies. In the experiment part, flexibility and surface morphology were chosen as coupling element, device of flexibility was designed, and concave morphology on the metallic material surface was achieved by machining method. Experimental scheme was arranged according to experiment optimized technology. Four experimental factors and three experimental levels were chosen based on the actual biological prototypes and the research results of our lab. Friction value was chosen to be the experimental index. Two contents were investigated in the experiments: (a) Experiment of the coupling specimen of flexibility and concave surface was operated. As comparison, specimen of smooth surface was added at the same experiment point. (b) The wearability influence rule of metal materials surface was analyzed, and wear resistance mechanism of coupling bionic was discovered. The results show that wearability of the coupling specimen of flexibility and concave surface was improved at some extent. In this experiment, the wearability went up to the best when the flexibility and proportion of removal surface was proper.In part 3, wear process analysis about bionic coupling of 2D and 3D material surfaces was analyzed by the nonlinear finite element software. Some physical parameters that can't be measured by common means can be obtained by this method, and the parameters of structure and movement can be modified conveniently. The method was very important to shorten the period new products was exploited and cut the cost. The results of 2D simulation show the equivalent stress of the following four specimens: the coupling specimen of flexibility and concave surface, coupling specimen of flexibility and specimen of smooth surface, specimen of concave surface and specimen of smooth surface. The data show that the stress gradually increased among the four specimens. So the theoretical foundation of bionic coupling surface improving the wearability was found out. In the process of 3D simulation, both of the flexibility and concave surface can improve the wearability, but the coupling of them can improve the wearability more. By using the software Ansys/LS-DYNA in this work, equivalent stresses of the coupling specimen of flexibility and concave surface, coupling specimen of flexibility and specimen of smooth surface, specimen of concave surface and specimen of smooth surface were got,which was very useful to probe and estimate the wear process and mechanism. This research has important reference value for the further research. This paper includes six chapters. Chapter 1 was introduction, which mainly introduced the fundamental theory of wear, the common and bionic methods to solve wear, the aim and significance of this research. Chapter 2 analyzed the characteristics of biological prototype of coupling biological flexibility and surface morphology. In chapter 3 , experimental scheme was arranged according to experiment optimized technology. The method of flexibility achievement was introduced. The wear experiment was operated. The mechanism of anti-wear ability of bionic coupling was studied and the best wearability was found out finally. In chapter 4, general concept and technique about wear was introduced, finite element software Ansys/LS-DYNA was studied, and theories of strength were introduced and studied also. Wear process of 2D and 3D simulation were fulfilled in chapter 5. The equivalent stress maps were analyzed. The rule of the equivalent stress was figured out finally. Chapter 6 was conclusions.