Leak flow analysis and contact mechanics between rough surfaces

2014 Fiscal Year Final Research Report

• Project/Area Number: 23560153
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Design engineering/Machine functional elements/Tribology
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: KYOGOKU Keiji 東京工業大学, 理工学研究科, 教授 (70153236)
• Co-Investigator(Kenkyū-buntansha): MOMOZONO Satoshi 東京工業大学, 大学院理工学研究科, 教授 (70262300)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: 粗面 / 接触 / すき間 / 流量係数

Outline of Final Research Achievements

As contact area increase, real contact and lubrication flow deviate from mixed lubrication theory based on the independent asperity contact hypothesis. In this project, contact mechanics and lubricant flow between contacting rough surfaces under high contact ratio condition have been addressed.
Contact analysis for non-Gaussian distributed rough surfaces have been performed by nonlinear finite element structural analysis, and flow between contacting rough surfaces have been calculated numerically for Reynolds equation problem. Contact area, interspace, and flow rate for 3D fabricated rough surfaces have been measured by total reflection method, contrasting density of dye, and gravimetric technique, respectively. As a result, skewness, which is a parameter for non-Gaussian distribution, have a significant influence on the conflation of contact area and leak flow rate, Low flow rate measured and calculate for negative value of skewness which is observed for truncated rough surfaces.

Free Research Field

機械要素・トライボロジー