Research on fractal model of normal contact stiffness for mechanical joint considering asperity interaction
| Autor: | Lida Zhu, Chunxia Zhu, Runqiong Wang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0209 industrial biotechnology
Materials science business.industry Mechanical Engineering Stiffness 02 engineering and technology Mechanics Structural engineering Surface finish Condensed Matter Physics Fractal dimension 020303 mechanical engineering & transports 020901 industrial engineering & automation Fractal 0203 mechanical engineering Machining Mechanics of Materials Mechanical joint medicine Surface roughness General Materials Science medicine.symptom Contact area business Civil and Structural Engineering |
| Zdroj: | International Journal of Mechanical Sciences. 134:357-369 |
| ISSN: | 0020-7403 |
| DOI: | 10.1016/j.ijmecsci.2017.10.019 |
| Popis: | The normal contact stiffness of mechanical joint has immediate impact on dynamic characteristics and machining precision of machine tools. A fractal contact stiffness model considering the effect of asperity interaction is proposed in this paper. On the basis of elastic theory, the deformation of a given asperity is deduced. The relationship between contact stiffness, normal load and contact area is derived from Hertz contact theory and fractal theory. The effect of asperity interaction on contact stiffness is studied by comparing with fractal model. The fractal smoothness is defined from relation between fractal parameters and surface roughness. It is concluded that with the increase of the fractal dimension D and the decrease of fractal roughness parameter G, the contact stiffness of the joint increases, and the effect of asperity interaction becomes greater. The fractal smoothness also affects the normal contact stiffness and the effect of surface smoothness can be offset by the asperity interaction. Experiment shows that the proposed model is more in line with the actual load-stiffness relationship. The model reveals the factors that affect stiffness of the joint, which can provide a theoretical basis for improving the rigidity and precision of integrated machineries. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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