2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation | |
Normal Stiffness model of bolted joint based on the modified three-dimensional elastic-plastic contact fractal model | |
材料科学;机械制造;运输工程 | |
Yin, Yunyao^1,2 ; Cai, Ligang^1,2 ; Liu, Zhifeng^1,2 ; Zhao, Yongsheng^1,2 ; Cheng, Qiang^1,2 | |
Institute of Advanced Manufacturing and Intelligent Technology, Beijing University of Technology, Beijing | |
100124, China^1 | |
Mechanical Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing, Beijing University of Technology, Beijing | |
100124, China^2 | |
关键词: Assembled structures; Contact deformation; Dynamic characteristics; Dynamic performance; Dynamical behaviours; Elastic-plastic contact; Experimental set up; Normal contact stiffness; | |
Others : https://iopscience.iop.org/article/10.1088/1757-899X/382/3/032042/pdf DOI : 10.1088/1757-899X/382/3/032042 |
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学科分类:材料科学(综合) | |
来源: IOP | |
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【 摘 要 】
Bolted joints have a significant effect on the dynamical behaviour of assembled structures. Accurate contact stiffness model of bolted joint is crucial in predicting the dynamic performance of bolted structures. In this research, a modified three-dimensional fractal model of normal contact stiffness is presented to more accurately predict the dynamic characteristic of a bolted assembly. In the present model, while the contact deformation exceed the critical value the elastic-plastic contact is used to take the place of Hertz elastic contact in the traditional M-B model, and revise the drawback that elastic-plastic contact occurs before elastic contact in existing elastic-plastic fractal models. As the increase of contact force, the plastic deformation of single asperity is considered again, which is omitted in the two type fractal models. An experimental set-up with two T-shaped specimen is designed conducted to verify the efficiency of the proposed model. Comparing with the ZX elastic-plastic fractal model, the present model can predict contact stiffness and dynamic performance more accurately, particularly, while for higher contact loads. The results show that the modified elastic-plastic fractal contact model can be used to more accurately predict the stiffness and dynamic characteristic of bolted structures in the machine tools.
【 预 览 】
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Normal Stiffness model of bolted joint based on the modified three-dimensional elastic-plastic contact fractal model | 664KB | ![]() |