Logo

 
CSME 2018/04
Volume 39 No.2 : 215-222
 
EHL of an Elastic Ball Impact and Rebound from a Lubricated Elastic Coated Surface

Li-Ming Chu a, Cai-Wan Chang-Jian b and Yuh-Ping Changc
aDepartment of Applied Science, Interdisciplinary Program of Green and Information Technology, National Taitung University, Taitung City, Taiwan 95092, ROC.
bDepartment of Mechanical and Automation Engineering, I-Shou University, Kaohsiung City, Taiwan 84001, ROC.
cDepartment of Mechanical Engineering, Kun Shan University, Tainan City, Taiwan 71070, ROC.


Abstract: The pure squeeze elastohydrodynamic lubrication (EHL) motion of circular contacts with an elastic coating is investigated at impact and rebound process from a lubricated surface. The Reynolds, the ball motion, the rheology, and the elastic deformation equations must be solved simultaneously to obtain the transient pressure profiles (P), film shapes (H), elastic deformation, normal squeeze velocities (Vc) and accelerations (Ac). The first peak of central pressure (Pc) occurred at maximum impact force at impact end. In the rebound process, cavitation appears at the position near the edges of the dimple, the pressure spike (Ps) and the minimum film thickness (Hmin) are developed at the edges of the dimple because of mass conservation, and closing moves towards the center of contact. At the end of rebound the Ps reached the contact center. The secondary peak is greater than the first peak. The effects of the elastic modulus (E) and thickness of coating (d) at impact and rebound process from a lubricated surface are discussed. Moreover, this research possesses academic innovation and value of industrial application, so it can be utilized by the industry to design and analyze mechanical components with coating.

Keywords:  EHL, Elastic coating, Elastic ball, Impact, Rebound

Download PDF
*Corresponding author; e-mail: 
© 2018  CSME , ISSN 0257-9731 





TOP