The Wear Simulation Of UHMWPE Based On Different Surface Texture

Currently howling success has been obtained about the research of the artificial joint, the artificial teeth and the heart valve etc.. However, various problems seem to be more and more outstanding in the clinical application for the wear of the plant body. Although some scholars have studied the wear law of the plant body by experiments in order to obtain the method of reducing wear, the study advance very slowly because of the complexity of the tribology system. This paper is engaged in studying how to reduce wear of the artificial joint material UHMWPE through numerical simulation of the finite element and adoption of the method of establishing the artificial textures on the material surface.This project was to utilize the finite element to analyze wear of two dimensional concave surfaces. The wear property of the stainless steel against UHMWPE was better than that of the stainless steel against the stainless steel through the stress analysis of smooth surface. In the course of two dimensional finite element simulations the equivalent stress of non-smooth surface was compared through three parameters: diameter, depth and distributing space. The results of the stress analysis show that the equivalent stress of the concave on the UHMWPE surface is larger than that of the concave on the stainless steel surface in the certain scope. Some mechanics characters were gained in this study using the software ANSYS. It is very useful to study the wear mechanism of non-smooth surface and predict the material wear. What is more, the outcome of this research has important practical value to apply othernon-smooth surface and the anti-wear ability of the material.On the basis of theoretic analysis and test data, a software "numerical simulationof UHMWPE wear property on diverse surface texture" is developed in ANASYS environment with the model of APDL and program software Visual C++ 6.0. The software is useful for carrying on the whole analysis of UHMWPE wear status easily. This system is composed of there modules. Texture design data are inputted by the users according to the practical application in order to confirm wear model, including material parameters, structure parameters and load. The finite element calculating module can carry on calculating stress value of contact fields automatically and canexport the result document. The gathering results module can show and print the distributing condition of contact stress using the style of nephogram, and various model parameters and the transformation animation. This software provides a new analysis tool for tribologists and engineers.