ISOTHERMAL ELASTOHYDRODYNAMIC LUBRICATION OF POINT CONTACTS .3. FULLY FLOODED RESULTS
ISOTHERMAL ELASTOHYDRODYNAMIC LUBRICATION OF POINT CONTACTS .3. FULLY FLOODED RESULTS
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DOI：
10.1115/1.3453074
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发表时间：
1977-01-01
期刊：
影响因子：
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通讯作者：
DOWSON, D
中科院分区：
文献类型：
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作者：
HAMROCK, BJ;DOWSON, D
利用作者在早期出版物中提出的理论，研究了椭圆率参数、无因次速度、载荷和材料参数对最小膜厚度的影响。椭圆度参数从1（板上的球结构）到8（接近线接触的结构）不等。无量纲速度参数在近两个数量级的范围内变化。无量纲载荷参数在一个数量级范围内变化。在计算无量纲材料参数的指数时，考虑了所用固体材料为青铜、钢和氮化硅，润滑剂为石蜡和环烷矿物油。用34种不同的情况得到了最小膜厚公式：H¯min=3.63U0.68G0.49W−0.073（1−e−0.68k）。在k=1.03RyRx0.64时，得到了椭圆度参数的简化表达式，并绘制了等高线图，详细显示了最小膜厚出现的压力峰和两个侧叶。这些薄膜厚度的理论解具有以往报道的基于光学干涉测量的实验观测的所有基本特征。
Utilizing the theory developed by the authors in an earlier publication, the influence of the ellipticity parameter, the dimensionless speed, load, and material parameters on minimum film thickness was investigated. The ellipticity parameter was varied from one (a ball on a plate configuration) to eight (a configuration approaching a line contact). The dimensionless speed parameter was varied over a range of nearly two orders of magnitude. The dimensionless load parameter was varied over a range of one order of magnitude. Conditions corresponding to the use of solid materials of bronze, steel, and silicon nitride and lubricants of paraffinic and naphthenic mineral oils were considered in obtaining the exponent in the dimensionless material parameter. Thirty-four different cases were used in obtaining the minimum film thickness formula given below as H¯min=3.63U0.68G0.49W−0.073(1−e−0.68k) A simplified expression for the ellipticity parameter was found where k=1.03RyRx0.64 Contour plots were also shown which indicate in detail the pressure spike and two side lobes in which the minimum film thickness occurs. These theoretical solutions of film thickness have all the essential features of the previously reported experimental observations based upon optical interferometry.