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Juan Chen,Keying Chen,Liangcai Zeng,Wenting Guo 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.12
In this paper, a numerical model of elastohydrodynamic lubrication (EHL) in the line contact which happens on the surface of particle-reinforced composites is given. The influence of the particle size and burial depth on the EHL is studied. According to the influence of the structural parameters on the friction coefficient of the EHL contact, the structural parameters of the particles in the composites are optimized and the proper region of the parameters is obtained. The displacement and stress in elastic field caused by the uniform eigenstrains in the particles are described in terms of Galerkin vectors with the interactions between the particles are ignored. A coupling method of particle reinforced composites problem and EHL problem is presented, a new film thickness function is given considered the uneven elastic deformation caused by the presence of the particles. Finally, the presentation of film thickness and fluid pressure of the EHL explains that appropriate particle size, particle burial depth and particle distance can effectively reduce the friction coefficient. The lubrication behavior between the contacted surfaces can be improved under the heavy load.
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Shiyuan Luo,Yongxin Jiang,Sandrine Thuillier,Philippe Castany,Liangcai Zeng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
A simplified 3D FE model based on McCormick’s model is developed to numerically predict the spatiotemporal behaviorsof the PLC effect in Ti-12Mo alloy tensile tests at 350 °C with strain rates from the order of 10–4 s−1 to 10–2 s−1. The materialparameter identification procedure is firstly presented in details, and the simulated results are highly consistent withexperimental ones, especially in terms of stress drop magnitudes and PLC band widths. The distribution of simulated stressdrop magnitudes at a constant tensile velocity (0.01 mm/s) follows a normal distribution and its peak value is in the range of26–28 MPa. Furthermore, the simulated band width slightly fluctuates with the increase of true strain and its average valueis about 1.5 mm. Besides, the staircase behavior of strain–time curves and the hopping propagation of the PLC band areobserved in Ti-12Mo alloy tensile process, which are related to the strain localization and stress drop magnitudes.
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