Analysis the Single Asperity of Contact Behavior and Study of Simulated Rough Surface Friction Behavior
| Autor: | Ching-Lin Huang, 黃建琳 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 The whole idea of this study is to investigate the contact behavior of single asperity which includes the effects of geometrical asperity, strain-hardening, junction growths, and yield strength by using Finite Element Analysis Package. Moreover, friction behavior of the real surface can be measured by knowing both Weibull Distribution which describes the distribution of asperity on the rough surface and the contact behavior of single asperity. Results of the experiment: (1) When single asperity has different deformations, its friction coefficients of adhesive parts are also varied. Under microcontact, the contact surface becomes fully elastic deformation and its friction coefficient of adhesive parts approaches 0. By increasing the load, friction coefficient increases as the contact area of plastic increases. However, when the load is between the critical values of its material, the coefficient of friction would start decreasing to a constant value because of the strain-hardening. (2) When the material has the same yield strength and the same load, larger coefficient of strain-hardening needs more flow stress for plastic deformation and creates less deformation from the flat pushing. Therefore, it has smaller friction coefficient as its area of plastic is smaller, and vice versa. (3) Under the same condition, the same load, asperities of different geometrical ellipsoid would have different c/b(asperity height/major axis), deformations, and friction coefficient. For larger c/b, it creates larger deformation and the friction coefficient is obviously decreasing due to strain-hardening and vice versa. (4) When contact deformation becomes larger, the percentage growth of junction’s area is bigger because of the tangential force from the junction. (5) By using the statistical method to describe the asperity height distribution of the real contact surface, it shows that when its deformation is increasing, the friction coefficient of whole sliding surface is obviously decreasing. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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