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RECONSTRUCTION OF ELASTOHYDRODYNAMICLUBRICATION THEORY

弹性流体动力润滑理论的重建

基本信息

批准号：
05452146
负责人：
KANETA Motohiro
金额：
$ 4.67万
依托单位：
KYUSHU INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452146/
关键词：
Tribology Rolling contact EHL Surface roughness Traction Non-Newtonian fluid Slide-to-roll ratio

项目摘要

On the basis of direct observations of point contact elastohydrodynamic lubrication (EHL) films under rolling/sliding conditions using the optical interferometric technique, it has been asserted that a new EHL theory should be constructed by taking into account the effects of differences in elastic moduli of the contacting surfaces, surface pressure components parallel to the tangent contact plane, and the solidification phenomenon of lubricating oils. The other main results are summarized as follows :(1)In the EHL conjunction shear flow dominates the fluid flow and pressure induced flow is almost absent.(2)As a result, a local oil film flows approximately at the average speed of the surfaces while holding the shape and thickness.(3)A local reduction in film thickness occurs at a certain area downstream and upstream of a groove or a dent according to a positive and negative values of slide-to-roll ratio, respectively. The local film reduction area increases as the value of slide-to-rol … More l ratio.(4)The recovery of the reduced film thickness to the smooth.surface value is attained by fluid entering the EHL area from the inlet and the flowing into the film reduction area across the groove or the dent in the direction of sliding.(5)If the wavelength of grooves is more than a|SIGMA|, reduced film thicknesses produced by the grooves never interfere, where a is the Hertzian contact radius and SIGMA is the slide-to-roll ratio.(6)Under conditions of a higher frequency of reciprocation and a shorter stroke length, the formation of a stable EHL film is inhibited. This is because air bubbles produced in the preceding stroke result in the oil starvation in the succeeding reverse stroke.(7)When the surface velocity of the body having a lower elastic modulus is faster than that of the body having a higher elastic modulus and when the radius of curvature of the former is larger than that of the latter, a deep conical depression (dimple) is produced in the contact area. The dimple behaves like a solid rather than a liquid, and the formation is dominated by the inside rather than inlet conditions. Less

在利用光学干涉技术对滚动/滑动条件下点接触弹流润滑膜进行直接观测的基础上，提出了一种新的弹流润滑理论，该理论应考虑接触表面弹性模量的差异、平行于切向接触面的表面压力分量以及润滑油凝固现象的影响。（1）在弹流联合作用下，剪切流占主导地位，压力诱导流几乎不存在。(2)As结果，局部油膜近似以表面的平均速度流动，同时保持形状和厚度。(3)A膜厚度的局部减小分别根据滑动-滚动比的正值和负值发生在凹槽或凹陷的下游和上游的特定区域处。局部减膜面积随滑距增大而增大 ...更多信息 l比率。（4）减小的油膜厚度恢复到光滑表面值是通过流体从入口进入弹流区并沿滑动方向穿过凹槽或凹坑流入油膜减小区来实现的。(5)If凹槽的波长大于a| Sigma|，由凹槽产生的减小的膜厚度从不干涉，其中a是赫兹接触半径，SIGMA是滑动滚动比。（6）在往复运动的频率越高、行程越短的条件下，稳定的弹流润滑膜的形成受到抑制。这是因为在前一个冲程中产生的气泡导致在随后的反向冲程中的缺油。（7）当具有较低弹性模量的物体的表面速度快于具有较高弹性模量的物体的表面速度时，并且当前者的曲率半径大于后者的曲率半径时，在接触区域中产生深圆锥形凹陷（凹坑）。凹坑的行为像一个固体，而不是液体，和形成是由内部，而不是入口条件为主。少