Prediction of High-Pressure Pheology of Lubricating Oils Based on Phase Diagram

1.声发射技术在牵引流体高压短时凝固中的应用大量研究证实了润滑油在准静态高压下凝固为无定形或玻璃状固体。然而，作为滚动轴承和牵引式无级变速器的润滑油在动态条件下的凝固情况并不清楚。通过冲击试验后的凹痕分析和冲击载荷作用下的声发射分析，对牵引液的高压短时凝固进行了研究。每次碰撞的强度都是通过声发射（AE）传感器测量的。基于试验油的相图，研究了无因次声发射阻抗值。在动态高压条件下，油的凝固过程与静态条件下的凝固过程基本一致。作为影响高压弹流接触牵引力的主要因素的润滑油体积模量相图首先由高压密度测量和其他方法得到。采用相图法对润滑油的体积模量进行了评价。体积模量与油分子堆积参数T_<VE>-T密切相关（其中T_<VE>为压力p下的粘弹性固体转变温度，T为油温）。然后，用球盘机测量弹性流体动力润滑牵引力。结果表明，最大牵引力系数与T_<VE>-T密切相关。结果表明，体积模量是影响润滑油牵引特性的重要因素。通过高压密度测量，得到了22种油的相图。在边界润滑条件下，采用四球试验对油品的抗磨特性进行了评价。结果表明，流体在滑动集中钢触点中的抗磨作用与油的分子堆积参数T_<VE>-T密切相关，除了EHL的作用外，凝固油对实际边界润滑抗磨性能的影响更大。证实了边界润滑下的固化油膜具有抗磨作用。金刚石砧孔（DAC）在2.20 GPa压力下测量润滑油的密度用金刚石砧孔作为产生压力的装置，可以测量油滴的密度。通过测量奥氏体不锈钢垫片厚度（厚度0.5mm）和腔室内径（内径0.5mm，高0.5mm）的体积变化来计算密度。在2.20GPa的压力下，研究了牵引油、空间应用润滑剂和矿物油的密度随压力的变化。每种润滑剂的密度变化以曲线拟合的形式呈现。制作了每种润滑剂的相图。少

1.Application of Acoustic Emission for High-Pressure short Time Solidification of Traction FluidsThe lubricating oils solidify at quasi-static high-pressure as the amorphous or glassy solids are verified by a number of studies. However, solidification of lubricating oil under the dynamic condition as the rolling bearings and the traction CVT is not clear. The high-pressure short time solidification of traction fluids is examined by the analysis of dent after the impact tests and AE analysis under impact loads. The intensity of each impact collision is measured by means of an acoustic emission (AE) sensor. The dimensionless AE r.m.s value is investigated by based on phase diagram of testing oils. It was recognized the solidification of oil under the dynamic high-pressure condition almost corresponded to the static condition.2.Bulk Modulus of Lubricating Oils as Predominant Factor Affecting Tractional Behavior in High-Pressure Elastohydrodynamic ContactsThe phase diagrams were first made … More up by high-pressure density measurements and others. The bulk modulus of lubricating oils was evaluated using a phase diagram. The bulk modulus is closely related to the oil molecular packing parameter T_<VE>-T (where T_<VE> is the viscoelastic solid transition temperature at pressure p, and T is the oil temperature). Next, the elastohydrodynamic lubrication traction was measured by a ball-on-disk machine. The results indicated that the maximum traction coefficient is closely related to T_<VE>-T. As a result, the importance of the bulk modulus as a predominant factor for traction characteristics lubricating oil was pointed out.3.Anti-Wear Action by Solidified Oil Film in Sliding Concentrated Steel ContactsThe phase diagram of twenty-two kinds of oil was obtained through high-pressure density measurement. The four-ball were teats were used to evaluate the anti-wear characteristics of oils in boundary lubrication condition. The results indicated that the anti-wear action by fluid in sliding concentrated steel contacts is closely related to the oil molecular packing parameter T_<VE>-T and besides the effect of EHL the solidification oils rather has a predominating influence on actual anti-wear performances of boundary lubrication. It is confirmed that the solidified oil film under the boundary lubrication has the anti-wear action.4.Measurement of the density of lubricating oils at pressures to 2.20 GPa using diamond anvil cell (DAC)Using a DAC as pressure-generating device, the measurement of of density of drop of oil became possible. The density is calculated by measuring the volume change from the thickness of austenitic stainless steel gasket (thickness 0.5mm) and inner diameter of chamber (inner diameter 0.5mm, height 0.5mm). The density variation with the pressure of traction oil, lubricant for space applications and mineral oil is investigated for pressures up to 2.20GPa. The density variation for each lubricant is presented as a curve fit. The phase diagram of each lubricant is made. Less