A new concept of the formation process of boundary lubrication films

2021 Fiscal Year Final Research Report

• Project/Area Number: 18K18813
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
• Research Institution: University of Hyogo
• Principal Investigator: Washizu Hitoshi 兵庫県立大学, 情報科学研究科, 教授 (00394883)
• Project Period (FY): 2018-06-29 – 2022-03-31
• Keywords: トライボロジー / 潤滑油 / 物理吸着・化学吸着 / 分子動力学 / 防錆剤 / 極圧剤 / 油性剤 / 反応力場

Outline of Final Research Achievements

We made molecular dynamics scheme to analyze physical adsorption of lubricant additives on a metal surface. For the oiliness agents, we show structure dependence of base oil on the oiliness additives. For the extreme pressure additives, we found the molecules form stable reverse misselle and do not adsorb in room temperature. For the chemical adsorption process on metal surfaces, we made metal and metal oxidized hybrid surface model to show selective adsorption using reactive force field. The method is extended for extreme pressure additives and compared with experiments. In order to apply Machine learning for organic soft materials, we introduced structure analysis using persistent homology and showed it is useful for evaluation function.

Free Research Field

界面の分子集団の大規模分子シミュレーション

Academic Significance and Societal Importance of the Research Achievements

潤滑油の添加剤を分子レベルから設計することは，トライボロジストの夢であった．境界潤滑が重要とされる現象，たとえば自動車エンジン，モーター部品，空調機のコンプレッサー，圧延等の金属加工過程，風力発電機の軸受・増速機や発電所のタービンといった大型機器など，幅広い分野とサイズの異なる潤滑条件において幅広く適用可能である．現在，軸受，オイル，金属，電機，重工，自動車，素材などの企業に社会還元すべく産学連携研究に本手法を適用している．