Investigation of Roughness Effect on Dynamic Behaviour of Frictional Interfaces T. I. Ozcan1,∗, A. Amireghbali1, D. Coker1,2 1 Department of Aerospace Engineering, Middle East Technical University, Ankara 06800, Turkey 2 Center of Wind Energy Research, Middle East Technical University, Ankara 06560, Turkey ∗ ilgin.ozcan@metu.edu.tr Keywords: Sliding friction, Stick-slip, Roughness, Maxwell-slip model Performance and reliability of the engineering materials are highly affected by the frictional sliding as the stick-slip behavior causes vibration and noise, unstable motion, wear and tear, and a reduction in the control accuracy [1-3]. Stick-slip and the steady sliding are the two sliding mechanisms observed in the friction tests. This study aims to investigate the roughness effect on the dynamic behavior of frictional interfaces. We model a rough elastic body using the Maxwellslip model (MSM) by introducing a randomness to the initial positions of the blocks of MSM by using beta probability distribution function (PDF). Surfaces with various roughness values are imitated by changing the shape parameter of beta PDF. Sliding of the blocks on a rigid substrate occurs by a constant speed driver that is connected to all blocks by the springs carrying only tangential load. Coulomb friction law is assumed at the interface. We have conducted frictional sliding experiments on PMMA blocks with various roughness values using an in-house friction experimental setup. Our simulation results showed that rougher surfaces are prone to exhibit steady sliding behavior whereas smoother surfaces are prone to exhibit stick-slip behavior. The results are compared with the experimental results. References [1] Hai-Quan, L., Xiao-Feng, L., Liu-Cheng, D., Guo-Ping, C. (2015). Deployment and control ofspacecraft solar array considering joint stick-slip friction. J. Aerospace Science and Technology,42, 342-352. [2] Ahmadi, G., Ellison, J., Grodsinsky, C. (1995). Vibration and control of equipment aboardspacecraft. Proceedings of SPIE, Active Materials and Smart Structures, 2427, 80. [3] Pfeiffer, F., Hajek, M. (1992). Stick-slip motion of turbine blade dampers. Phil. Trans. R. Soc.Lond. A, 338, 503-517. 127
RkJQdWJsaXNoZXIy MjM0NDE=