Analytical Study of Adhesive Contact between Sphere and Flat with Subnanometer Roughness and Lubricant

2015 Fiscal Year Final Research Report

• Project/Area Number: 24560154
• 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: Ono Kyosuke 東京工業大学, 工学院, 名誉教授 (40152524)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: ナノトライボロジー / ヘッド・ディスクインタフェース / 希薄液膜流動 / 表面分子間力 / コンタクトメカニクス / ナノメニスカス

Outline of Final Research Achievements

Various problems encountered in proximity and asperity contact regime of flying magnetic head in magnetic disk storages were theoretically clarified. Firstly, vibration characteristics of head slider in light contact regime was theoretically explained based on the JKR adhesion theory. Secondly, a new diffusion equation for submonolayer liquid film was developed and it was shown that the replenishment flow of lubricant into a depleted groove can be well evaluated by using this equation. Thirdly, numerical analysis method of elastic contact caused by meniscus adhesion pressure was newly proposed and it was shown that many experimental results were consistently explained by elastic meniscus contact analyis under various conditions of lubricant thickness, asperity radius and elastic modulus. Fourthly, asperity parameter values of current magnetic disks were measured. This is necessary for correct evaluation for asprity adhesion contact characteristics in the head-disk interface.

Free Research Field

トライボロジー