Establishment of Non-Newtonian Thermal Elastohydrodynamic Lubrication Theory

等温弹流润滑理论对于改善非协调表面集中接触机械零件的工作性能、功能和耐久性具有重要作用。从理论和实验两个角度对等温弹流润滑理论进行了重新审视，建立了非牛顿热弹流润滑理论的基础，该理论考虑了接触中各方向的温度分布。从实验上阐明了等温流变液分析的局限性。研究还发现，弹流润滑流态可分为三种类型，即泛滥、完全泛滥和饥饿。利用横向波脊，从实验的角度讨论了表面破坏的原因。建立了点接触热弹流润滑问题的非牛顿数值分析方法，讨论了表面粗糙度对膜厚分布、…分布的影响讨论了更多的压力、温度和牵引力系数。此外，还讨论了表面粗糙度取向和接触椭圆度比对表面失效的影响。基于粗糙光滑表面的油膜温度测量，证明了弹流接触中的油是一种非牛顿流体。影响滚动接触疲劳现象的油膜压力分布取决于接触表面的导热系数、滑滚比和压粘系数。在滑滚比很低的情况下，压缩加热对牵引系数的影响很大。讨论了滚滑条件下冲击载荷的影响。从实验和理论两个方面讨论了往复运动下的摩擦特性。在此基础上，阐明了往复密封的油膜击穿机理和碳烟磨损机理，并研制了一种新型的润滑脂弹流体膜介电击穿检测装置。较少

Isothermal elastohydrodynamic lubrication (EHL) theory has played an important role for improving the working performance, function and durability of machine elements having a concentrated contact between non-conforming surfaces. The basis of non-Newtonian thermal elastohydrodynamic lubrication theory has been established by reconsidering the isothermal EHL theory from the theoretical and experimental viewpoints which consider temperature distributions in all directions in the contact.1. The limitation of isothermal EHL analysis has been elucidated experimentally. It is also found that the EHL regime is divided into three types, i.e., over flooded, fully flooded and starved.2. By using transversely oriented ridges, the causes of surface failures have been discussed from experimental viewpoints. A non-Newtonian numerical analysis method for the thermal EHL problems in point contacts has been developed, and the effects of surface roughness on the film thickness profile, distributions of … More pressure and temperatures and the traction coefficient have been discussed. Furthermore, the effects of the surface roughness orientation and the ellipticity ratio of the contacts on surface failures have been discussed. Based on the oil film temperature measurements for rough-smooth surfaces, it has been proved that the oil in EHL contacts behaves as a non-Newtonian fluid.3. The film pressure distribution, which affects the rolling contact fatigue phenomenon, depends on the thermal conductivities of both contacting surfaces, slide-roll ratio and pressure-viscosity coefficient. The compressive heating plays a significant role on the traction coefficient at very low slide-roll ratios.4. The effects of impact loads under rolling/sliding conditions have been discussed.5. Tribo-characteristics under reciprocating motion have been discussed from experimental and theoretical viewpoints.6. Based on the results described in above, the mechanism of oil film breakdown of reciprocating seals, the mechanism of soot wear have been clarified, and a new device, which can detect the dielectric breakdown of the grease EHL film, has been developed. Less