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

1.声发射技术在牵引油高压短时固化中的应用大量研究证实，在准静态高压下，润滑油以无定形或玻璃态固体的形式凝固。然而，润滑油在动态条件下的凝固情况如滚动轴承和牵引式CVT尚不清楚。通过冲击试验后的凹坑分析和冲击载荷下的声发射分析，验证了牵引液的高压短时固化。每一次碰撞的强度都是通过声发射(AE)传感器测量的。根据试验油的相图，研究了无因次的AER.M.S值。认为油在动态高压条件下的凝固几乎与静态条件相一致。2.润滑油的体积模数是影响高压弹流接触中牵引力行为的主要因素。首次绘制了…相图更多的是通过高压密度测量和其他方法。用相图计算了润滑油的体积弹性系数。体积弹性模量与油分子堆积参数T&lt；Ve&gt；-T密切相关(其中T&lt；Ve&gt；是压力p下的粘弹性固体转变温度，T是油温)。其次，利用球盘机测量了弹性流体动力润滑牵引力。结果表明，最大牵引力系数与T&lt；Ve&Gt；-T密切相关。指出了体积模数作为润滑油牵引特性主导因素的重要性。3.滑动浓缩钢触头中凝固油膜的抗磨作用通过高压密度测量得到22种油的相图。用四球磨损试验机评价了边界润滑条件下油的抗磨性能。结果表明，浓缩钢滑动接触中流体的抗磨作用与油的分子堆积参数T&lt、Ve&gt；-T密切相关，除了弹流润滑的作用外，凝固油对边界润滑的实际抗磨性能有较大影响。证实了边界润滑下的凝固油膜具有一定的抗磨作用。4.采用金刚石顶压室(DAC)测量2.20 Gpa压力下的润滑油密度，采用DAC作为压力发生装置，使油滴密度的测量成为可能。密度是通过测量奥氏体不锈钢垫片厚度(厚度0.5 mm)与药室内径(内径0.5 mm，高度0.5 mm)的体积变化来计算的。在2.20 Gpa压力下，研究了牵引油、空间用润滑油和矿物油的密度随压力的变化规律。每种润滑剂的密度变化以曲线拟合的形式表示。绘制了每种润滑剂的相图。较少

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