zhidong duan | Lanzhou Jiaotong university (original) (raw)
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Papers by zhidong duan
Applied Thermal Engineering, 2017
According to the actual geometry and sizes of rail and wheel, the thermo-mechanical coupling 3-D ... more According to the actual geometry and sizes of rail and wheel, the thermo-mechanical coupling 3-D fine finite element model of wheel/rail contact was established by using ANSYS software. In the process, both the physical parameters of materials and friction coefficient between wheel and rail are seen as the functions of temperature. In this research, the 3-D characteristics of the sliding contact of wheel/rail were analyzed, including the following aspects: 1) the 3-D distribution characteristics of the temperature and strain of wheel and rail; 2) the contact patch and action zone on the rail surface under the condition of sliding etc.. The results of research show that the shape of the contact patch is similar to Hertz ellipse in the initial contact of wheel/rail, and the shape is more complex in sliding contact. The contact temperature on the wheel surface increases with time during wheel in sliding, reaches the maximum value at the end of sliding and is far greater than the temperature on rail surface. The results of 2-D and 3-D model show that the temperature of 2-D model is higher than that of 3-D model. The maximum value of plastic strain occurs on the surface and subsurface of contact region which may cause the rail surface to peel or scratch.
Journal of Vibroengineering, Sep 30, 2018
In order to research the temperatures and dynamic characteristics of wheel/rail at different cree... more In order to research the temperatures and dynamic characteristics of wheel/rail at different creep ratios, a thermal-mechanical coupling model of 3-D wheel/rail-foundation contact system and a new experimental device are introduced. The results indicate the temperatures ascend gradually with the growth of creep ratios, the maximum temperature of wheel and rail surface is respectively 626.1 °C and 514.2 °C. Because of the thermal effects, the accelerations of wheel/rail descend gradually with the rise of creep ratios. The influences of creep ratios on the vertical displacements are not obvious. The maximum absolute vertical displacement of wheel and rail is respectively 1.16 mm and 1.33 mm. And the normal contact force of wheel/rail and the dynamic factor ascend gradually with the rise of braking speeds.
Applied Thermal Engineering, 2017
According to the actual geometry and sizes of rail and wheel, the thermo-mechanical coupling 3-D ... more According to the actual geometry and sizes of rail and wheel, the thermo-mechanical coupling 3-D fine finite element model of wheel/rail contact was established by using ANSYS software. In the process, both the physical parameters of materials and friction coefficient between wheel and rail are seen as the functions of temperature. In this research, the 3-D characteristics of the sliding contact of wheel/rail were analyzed, including the following aspects: 1) the 3-D distribution characteristics of the temperature and strain of wheel and rail; 2) the contact patch and action zone on the rail surface under the condition of sliding etc.. The results of research show that the shape of the contact patch is similar to Hertz ellipse in the initial contact of wheel/rail, and the shape is more complex in sliding contact. The contact temperature on the wheel surface increases with time during wheel in sliding, reaches the maximum value at the end of sliding and is far greater than the temperature on rail surface. The results of 2-D and 3-D model show that the temperature of 2-D model is higher than that of 3-D model. The maximum value of plastic strain occurs on the surface and subsurface of contact region which may cause the rail surface to peel or scratch.
Journal of Vibroengineering, Sep 30, 2018
In order to research the temperatures and dynamic characteristics of wheel/rail at different cree... more In order to research the temperatures and dynamic characteristics of wheel/rail at different creep ratios, a thermal-mechanical coupling model of 3-D wheel/rail-foundation contact system and a new experimental device are introduced. The results indicate the temperatures ascend gradually with the growth of creep ratios, the maximum temperature of wheel and rail surface is respectively 626.1 °C and 514.2 °C. Because of the thermal effects, the accelerations of wheel/rail descend gradually with the rise of creep ratios. The influences of creep ratios on the vertical displacements are not obvious. The maximum absolute vertical displacement of wheel and rail is respectively 1.16 mm and 1.33 mm. And the normal contact force of wheel/rail and the dynamic factor ascend gradually with the rise of braking speeds.