Lubricant behaviour in concentrated contact systems — the castor oil-steel system
Lubricant behaviour in concentrated contact systems — the castor oil-steel system
复制标题
DOI：
10.1016/0043-1648(59)90264-9
复制
发表时间：
1959-05
期刊：
影响因子：
5
通讯作者：
F. W. Smith
中科院分区：
文献类型：
--
作者：
F. W. Smith
描述了测量用蓖麻油润滑的淬火钢表面之间的摩擦力的实验。在一系列实验中，不同大小的球在移动的平面上滑动，最大赫兹应力为38.9万磅/平方英寸。(273.5千克/平方毫米)，速度范围高达140厘米/秒。在另一个实验中，测量了以小的滑动运动分量滚动的滚子之间的摩擦力，弹性应力与第一个实验中使用的弹性应力相似。在对这些测量的解释中，得出的结论是，在一定的速度范围内，大部分摩擦力通过充当剪切强度随温度升高而降低的塑料固体的润滑剂膜传递，并且在滑动实验中，摩擦系数基本上给出了润滑剂中温度升高的量度。进一步提出，在这种类型的集中接触系统中，摩擦力由润滑剂的高应力塑性屈服决定，薄膜厚度由粘性流动特性决定。
Experiments are described in which frictional forces are measured between hardened steel surfaces lubricated with castor oil. In one series of experiments, balls of different sizes slide against a moving plane at a maximum Hertz stress of 389,000 p.s.i. (273.5 kg/mm2) over a range of speeds up to 140 cm/sec. In another experiment the frictional force is measured between rollers which roll with a small component of sliding motion, the elastic stresses being similar to those used in the first experiment.In an interpretation of these measurements, it is concluded that in a certain range of speed most of the frictional force is transmitted through a film of lubricant acting as a plastic solid whose shear strength decreases with increasing temperature, and that in the sliding experiment the coefficient of friction gives essentially a measure of the temperature rise in the lubricant.It is further suggested that in concentrated contact systems of this type where the frictional force is determined by the high-stress plastic yield of the lubricant, the film thickness is determined by viscous flow properties.