An adhesion model for wheel-rail contact at the micro level using measured 3d surfacesl

作者：Zhu Y^*; Olofsson U

来源：Wear, 2014, 314(1-2): 162-170.

DOI：10.1016/j.wear.2013.11.031

• Wheel-rail
• Rolling-sliding contact
• Contact temperature
• Local friction coefficient
• Adhesion
• Measured 3D surfaces

Railway vehicles require a certain level of wheel rail adhesion for efficient, reliable, and economical operation. A comprehensive wheel-rail contact model is useful for optimizing the adhesion, to simulate vehicle running conditions and to predict wear and rolling contact fatigue. A new contact model using measured 3D surfaces has been developed, comprising normal contact, rolling sliding contact, flash temperature, and local friction coefficient models. This model can predict the local contact pressure, including the plasticity, local flash temperature, local tangential stress, local friction coefficient, and global adhesion coefficient. The influence of surface topography, creep, and speed on the adhesion coefficient, real contact area, and contact temperature is discussed. Results indicate that, due to increased contact area, the adhesion coefficient decreases with increased surface roughness, although the change is small. Furthermore, increasing speed reduces the adhesion coefficient due to the increasing contact temperature.

• 出版日期2014-6-15