摘要
本文讨论了弹流润滑的屈服问题,从润滑剂的极限剪应力可以得到屈服膜厚的表达式。屈服膜厚是弹流润滑膜的下限。当利用拟合公式得到的膜厚小于屈服膜厚时,由于润滑已经处在非牛顿区,所以拟合公式已不再适用。本文还给出了用膜厚形式表示的屈服准则,并详细讨论了最大压力、平均速度和滑滚比对屈服膜厚的影响。最后,利用拟合公式的膜厚和屈服膜厚相等的条件推导出屈服边界的表达式。利用屈服边界很容易确定牛顿和非牛顿流体润滑区,以便正确使用现有的拟合公式。
Ayield film thickness is obtained by setting the shear stress equal to the limiting shear stress. The yield thickness is the lower limit of elastohydrodynamic lubrication film thickness. If the thickness calculated from an asymptotic formula is thiner than the yield thickness, the asymtotic formula cannot be used because the lubrication has been in the non-Newtonian region. The influences of the maximum pressure, the average velocity and the slide- roll ratio on the yield thickness are discussed in detail. After the yield criterion is given in the film form, the yield boundary equations for the line and point contacts are obtained by setting the asymptotic film formulas and the yield film formulas to be equal. The yield boundary divides the lubrication space into Newtonian and non-Newtonian regions. With the use of the yield boundary, the Newtonian region, where the asymptotic formulas are valid, can be easily determined under the given operating condition.
出处
《润滑与密封》
EI
CAS
CSCD
北大核心
1996年第6期18-23,共6页
Lubrication Engineering
关键词
滑动
屈服膜厚
屈服边界
弹性流体
Elastohydrodynamic Lubrication, Yield Film Thkkness, Yfeld Boundary, Sliding Probtem.
