Tribological properties of hierarchical micro-dimples produced on a cylindrical surface by dual-frequency texturing  

作　　者：Saood ALI Rendi KURNIAWAN Park Gun CHUL Tae Jo KO 

机构地区：[1]School of Mechanical Engineering,Yeungnam University,Gyeongsan-si 712749,Republic of Korea

出　　处：《Friction》2023年第2期246-258,共13页摩擦（英文版）

基　　金：the 2020 Yeungnam University research grant.

摘　　要：An experimental investigation was performed for investigating the tribological performance of micro-dimple surface texture patterns on a cylindrical surface in a realistic operating environment of starved lubrication. Micro-dimples were generated by a dual-frequency surface texturing method, in which a high-frequency (16.3 kHz) three-dimensional (3D) vibration and a low-frequency (230 Hz) one-dimensional (1D) vibration were applied at the tool tip simultaneously, resulting in the generation of the hierarchical micro-dimples in a single step. Rotating cylinder-on-pin tribological tests were conducted to compare the tribological performance of the non-textured reference specimen and micro-dimple samples. The effect of surface textures generated with various shape parameters (long drop and short drop), dimension parameters (length and surface texture density), and operation parameters (load and sliding velocity) on the tribological performance was evaluated. Stribeck curves indicate that the hierarchical micro-dimples exhibit a lower coefficient of friction than the reference specimen in the high contact-pressure regions. It is also observed that variation in the length of a micro-dimple, the shape effect, is the major factor affecting the friction response of the textured surfaces. The generation of additional hydrodynamic pressure and lift effect by hierarchical structures is the main reason for the improved performance of hierarchical micro-dimple surfaces.

关 键 词：dual-frequency surface texturing hierarchical surfaces TRIBOLOGY starved lubrication three-dimensional elliptical vibration transducer 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TM503.5[金属学及工艺—金属学]