For decades, wear and friction have been one of the major concerns in mechanical elements. Researchers are always looking for ways to improve the properties of materials Tribology. One of the new methods to mitigate the wear rate and the friction coefficient is to generate micro-dimples on the surface with the help of laser. In this research the effects of surface patterns on the running-in behavior of ST37 disk have been experimentally and analytically studied. experimental study were conducted with a pin-on-disk apparatus at sliding speeds 0.1–0.4-0.7 m/s and applied forces 40-60N. in distances of 250, 500, 750 and 1000 test was stopped and samples were measured to calculate weight loss. It is shown that increasing the velocity and decreasing the applied load results in a reduction in the wear rate. The results also indicate that dimples improve the friction coefficient about 12-23% and the wear rate 50%. In numerical study,move the pin on disk was modeled. Reynolds equation is solved using finite difference method (FDM) on the surface for find the pressure distribution in the lubricant oil film. The effact input parameters such as speed, load, and aspect ratio dimple on the film thickness and load carrying capacity was evaluated.The usefulness of dimples highly depends on the speed which has a tremendous effect on the film thickness. In low velocities, dimples will actually decrease the thickness of the lubricant film causing a reduction in the load-carrying capacity. With increase the speed micro-dimples to improve amount lubricant film thickness and the load carrying capacity. In three aspect ratios was investigated, it was found that increasing the aspect ratio can be reduced or increased film thickness and load carrying capacity . Finally friction coefficient measured in the experiment in three different speed with friction coefficient in the numerical were compared. It was found that the difference between the actual data and empirical almost 2 percent. Keywords: Laser surface texturing, Lubrication, Load-carrying capacity,Wear, friction coefficient.
