弾性流体潤滑下における中間層を有するコーティング膜の応力評価に基づく設計指針

抄録

 In recent years, sliding performances of mechanical elements have progressed by using coated films which possess superior tribological properties. This has led to the reduction of mechanical element failures. Coated films are often used under severe conditions such as elastohydrodynamic lubrication (EHL). In this paper, in order to devise design guidelines with broad applications for a coated film with interlayer, stress distributions of the coated film, interlayer, and substrate over a wide range of Young’s modulus values for a point contact under EHL conditions were numerically investigated in detail using a three-dimensional analysis method. The results suggest that when the thinner coated films are used, it is preferable that the Young’s modulus of the interlayer ranges from that of the coated film to that of the substrate. In addition, it is desirable to have an interlayer which is not too thick when the Young’s modulus of coated films are smaller than that of substrate, and that the interlayer have larger values of thickness when the Young’s modulus of coated films are larger than that of substrate. On the other hand, when the thicker coated films are used, it is preferable that the interlayer have a certain amount of thickness. Furthermore, when the Young’s modulus of the coated film is larger than that of substrate, it is preferable that the Young’s modulus of the interlayer is larger than that of the substrate.