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Establishment of Non-Newtonian Thermal Elastohydrodynamic Lubrication Theory

非牛顿热弹流润滑理论的建立

基本信息

批准号：
15002009
负责人：
KANETA Motohiro
金额：
$ 138.11万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Specially Promoted Research
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2007
项目状态：
已结题

项目摘要

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

等温弹流润滑（EHL）理论对于提高非适形表面之间集中接触的机器元件的工作性能、功能和耐用性发挥了重要作用。从理论和实验的角度重新考虑等温EHL理论，考虑接触面各个方向的温度分布，建立了非牛顿热弹流润滑理论的基础。 1．等温 EHL 分析的局限性已通过实验阐明。研究还发现，EHL状态分为过度淹没、完全淹没和饥饿三种类型。 2．通过使用横向脊，从实验的角度讨论了表面失效的原因。开发了一种针对点接触热 EHL 问题的非牛顿数值分析方法，并讨论了表面粗糙度对薄膜厚度分布、压力和温度分布以及牵引系数的影响。此外，还讨论了表面粗糙度方向和接触椭圆率对表面故障的影响。基于粗糙光滑表面的油膜温度测量，证明了EHL接触中的油表现为非牛顿流体。 3．影响滚动接触疲劳现象的薄膜压力分布取决于两个接触表面的导热率、滑辊比和压力粘度系数。在非常低的滑滚比下，压缩加热对牵引系数起着重要作用。4．讨论了滚动/滑动条件下冲击载荷的影响。5．从实验和理论角度讨论了往复运动下的摩擦特性。 6．基于上述结果，阐明了往复式密封件油膜击穿的机理、烟灰磨损的机理，并开发了一种可检测润滑脂EHL膜介电击穿的新装置。较少的