Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 53 Issue 5 (Special Issue) 2021 07 23 Transient numerical modeling and experimental investigation of the effect of surface texture on elastohydrodynamic lubrication Transient numerical modeling and experimental investigation of the effect of surface texture on elastohydrodynamic lubrication 3201 3212 4090 10.22060/mej.2020.18106.6737 FA Amir Torabi Assistant professor, Engineering Department, Shahrekord University, Shahrekord, Iran. Saleh Akbarzadeh Associated professor, Mechanical Engineering Department, Isfahan University of Technology, Isfahan, Iran Behnam Azami صنعتی اصفهان-مهندسی مکانیک Journal Article 2020 03 13 <span style="letter-spacing: .05pt;">The phenomenon of abrasion and friction in mechanical mechanisms and the ways to reduce them have been highly regarded. One of these methods is surface texturing, which can be accomplished using a laser with high speed and accuracy. These textures usually include holes with different geometric shapes. In this study, a precise numerical model is developed to investigate the frictional behavior of the dimple transient film formation effect. Then the effect of laser-made textures on a ST37 steel disc is studied experimentally in linear contact situation in the mixed lubrication regime. In this study, the friction coefficient is measured after 100m distance for different input important parameters of velocity and vertical load. Numerical results have shown that flow modeling using conventional two-step modeling cause a considerable error and taking about 11 time steps for crossing the dimple is recommended. The friction coefficient decreases with increasing speed and decreasing applied force. Comparison of the results between the textured and smooth discs showed that the friction coefficient decreased by 12 to 23% in the experimental study, while numerical estimates of the possibility of a decrease of between 25 and 40% were also predicted. At high velocities, the numerical model estimates and the results of the experiment are very close.</span> <span style="letter-spacing: .05pt;">The phenomenon of abrasion and friction in mechanical mechanisms and the ways to reduce them have been highly regarded. One of these methods is surface texturing, which can be accomplished using a laser with high speed and accuracy. These textures usually include holes with different geometric shapes. In this study, a precise numerical model is developed to investigate the frictional behavior of the dimple transient film formation effect. Then the effect of laser-made textures on a ST37 steel disc is studied experimentally in linear contact situation in the mixed lubrication regime. In this study, the friction coefficient is measured after 100m distance for different input important parameters of velocity and vertical load. Numerical results have shown that flow modeling using conventional two-step modeling cause a considerable error and taking about 11 time steps for crossing the dimple is recommended. The friction coefficient decreases with increasing speed and decreasing applied force. Comparison of the results between the textured and smooth discs showed that the friction coefficient decreased by 12 to 23% in the experimental study, while numerical estimates of the possibility of a decrease of between 25 and 40% were also predicted. At high velocities, the numerical model estimates and the results of the experiment are very close.</span> https://mej.aut.ac.ir/article_4090_9e0a70e8048d20d84f2fdd712f7f0566.pdf