It was found that the three kinds of nano-particulates were all effective to improving the friction-reducing and antiwear abilities of the lithium grease, which was attributed to the formation of the boundary lubricating and protective layers on the worn steel surfaces lubricated with the base grease containing different kinds of nano-particales, by way of physico-chemical adsorption and/or tribochemical reactions.
结果表明：3种纳米微粒作为添加剂均能够显著提高锂基脂的减摩抗磨能力；锂基脂及含不同纳米添加剂的锂基脂润滑下的钢球磨损表面形貌及其表面保护膜的性质存在明显差异，这种差异决定了钢-钢摩擦副在相应脂润滑条件下的摩擦磨损性能差异；含纳米SiO2的锂基脂润滑下的钢球磨损表面形成的含纳米SiO2的表面保护膜均匀且厚度适中，故其相应的减摩抗磨效果最佳。
PART 1: TESTING OF THE FRICTION AND WEAR BEHAVIOUR OF BEARING MATERIAL/MATING MATERIAL/OIL COMBINATIONS UNDER CONDITIONS OF BOUNDARY LUBRICATION.
第1部份：带耐磨材料，配料和油的组件在极限润滑条件下摩擦与磨损性能试验
It is the sealing mechanism: oil seal lip and shaft surface contact between the dry friction at the same time, boundary lubrication and fluid lubrication of three, and will have a turn.
它的密封机理是：油封唇部和轴之间的接触表面上同时并存干摩擦、边界润滑和流体润滑三种情况，并不断交替产生。
Although the friction coefficient did not decreased in the condition of boundary friction, the volume loss of the composite by wear during severe-wear stage was also must smaller than that of traditional Babbitt alloy, and the fluctuation of friction coefficient decreased.
在边界摩擦条件下，短切碳纤维增强锡基巴氏合金与钢配副的摩擦系数虽没有降低，但磨损后期的磨损量也要比铸态锡基巴氏合金的小得多，摩擦系数的波动也减小。
The improvement in the antiwear and friction-reduction behavior of the Al-steel pair is attributed to the formation of the boundary film composed of aluminum phosphate and/or aluminum phosphite on the lubricated surfaces.
XPS分析表明，在铝合金磨损表面形成了含磷酸铝的表面膜，这是提高摩擦副抗磨性能的关键。
And more, the article dissects the friction of the joggle, notarizes that the character of the friction is mixed friction which is near boundary friction, and get a conclusion that the rolling part of friction can be neglect through a c...
继而对该处的摩擦问题进行剖析，确认滑动性质为接近边界摩擦的混合摩擦，并且通过一个实例计算得出滚动摩擦部分可忽略不计的结论。
By means of metallographic analysis, stereoscan photograph, energy spectrum analysis, the macroscope, microscopic fractography and metallographic structure of the typical crack has been analyzed to indicate the plate-hole crack property, the crack source, the crack propagation direction and the variation rule of the crack tip The analysis results have established a basis for further analyzing the cause and propagation law of the crack. Based on the standard of UIC510-5, the boundary condition under mechanical load has been determined. Applying friction power method, the heat input during braking has been determined.
基于UIC510-3标准，确定机械载荷下车轮的边界条件，通过摩擦功率法确定制动过程中的热量输入；采用有限元方法，分别对辐板孔边在机械载荷作用下的应力场、典型制动热负荷下的温度场及热应力场进行数值模拟，分析辐板孔偏向轮辋和踏面磨耗对温度场及应力场的影响，为进行辐板孔疲劳强度评定和寿命预测提供载荷条件。
A full scale model of a reciprocating sliding system is established and meshed, which includes the friction force and actual boundary conditions.
发展一种利用商业有限元软件进行摩擦系统全模型摩擦噪声预测的方法，可以对包括摩擦力和真实边界条件下的摩擦系统的复特征值进行分析，提出进行摩擦噪声预测的主要步骤。
It is found from the analysis of the starting-up flow that the boundary effect happens and the hard core of the flow speeds up equably. However, the flow near the pipe wall is lagged out till cease because of the friction.
分析发现启动流发生了边界层效应，流体的核心部分均匀地加速，但在壁附近的区域流体受到摩擦滞止。
For thinner films, stacking faults are preferred in the scratch process, which increase storage capacity of plastic deformation in the film, and further inhibit the stick slip amplitude in the friction oscillation process. For thicker films, dislocation loops, which glide along slip plane downward to the grain boundary, dominate over the stacking faults, and finally dissipate on the grain boundaries. Since the intergrain stacking faults are inactive in thicker films, the stick slip phenomenon is similar to that in single crystal.
摩擦过程中易在较薄的薄膜表面和薄膜晶界之间产生穿晶层错，穿晶层错的产生增加了薄膜蓄积塑性变形的能力，从而抑制材料表面摩擦力在黏滑过程中的振荡幅度；在比较厚的薄膜中不易生成穿晶层错，在摩擦过程中位错环依次向体材料发射，并与晶界反应，湮灭于晶界，黏滑动摩擦响应与单晶相似。
By analyzing and comparing the rolling friction mechanism of two bodies contacted each other, the conclusion that the pressure redistribution in the contact area was the main reason that the torque which impacted on the cylinder had been counteracted was drawn. According to the conclusion, the balance equation of the cylinder in the normal force and the torque was set up. And combining the boundary condition of the pressure in the contact area, the contact pressure was solved.
对相互接触的两物体的滚动摩擦机理进行了对比分析，提出了接触区的压力的重新分布是克服作用于圆柱上转矩的主要原因，并依此列出在法向载荷及转矩作用下力的平衡方程，根据接触区压力的边界条件，求出了此时接触区域的接触压力。
In the thesis, a treatment scheme of moving boundary friction constraint is proposed for first time.
本文首次提出一种动态边界界面约束处理方法。
The sub-models are interactive and correlative, the primary contents calculated in each sub-model are as follows:(1) Temperature field model: According to actual producing process of hotrolled strip, various boundary conditions were taken into account, including heat losing process such as air cooling, scaling, contacting with roll, cooling between stands, laminar cooling, coil cooling, and heat generating process such as heat of deformation, friction heat, latent heat of phase transformation, and so on.
在本文中，提出以微中浪轧制策略补偿冷却不均造成的板形不良，从理论上分析了微中浪轧制策略的可行性，并给出不同规格带钢的最佳设定值，使微中浪轧制设定由目前依靠经验的尝试性阶段，上升到根据理论计算定量化的描述阶段，对于指导热轧带钢的生产具有重要的意义和实用价值。
Dry friction and wear, fluid leakage lubrication in boundary lubrication, the oil seal lip and the axis of the interface layer between the hydrodynamic stability of film, film thickness of about 00025mm; that in addition to used lubricating oil film layer, the also play the role of seals.
干摩擦产生磨损，流体润滑产生泄漏，在边界润滑下，油封唇部与轴的界面之间形成一层稳定的流体动压油膜，油膜厚度约00025mm；这层油膜除用作润滑之外，还起密封作用。
On the basis of the investigation above, the tribological characteristics of short carbon fiber-reinforced Sn-matrix Babbitt alloy composite were compared with that of traditional Sn-matrix Babbitt alloy in dry and boundary friction conditions with different applied pressures and sliding velocities according to the requirements of a plain bearing tribo-system.
采用粉末冶金法可制造纤维含量较少、纤维分布均匀的短切碳纤维增强锡基巴氏合金，短切碳纤维的加入，可有效提高锡基巴合金在高温条件下的硬度及压缩屈服强度，降低锡基巴氏合金力学性能的温度敏感性。
By adopting dynamic explicit finite element algorithm, dual mesh technique or virtual mass and velocity, the run time has ben reduced, and nonlinear boundary problems of contact and friction have been deeply studied.
新闻摘要：综述了环件冷辗扩成形模拟技术的最新进展：冷辗扩成形模拟已经由简化几何和材料模型的分析转向全面的三维分析，通过采用动力显式有限元算法、双网格技术、虚拟质量和速度等技术减少了计算时间，接触和摩擦等非线性边界问题得到深入的研究。
And it is proved of existence and uniqueness of the solution to the condensation matrix for the three-dimensional elasto-plasticity contact problem with friction, which settles the mathematical basis for the three-dimensional elasto-plasticity frictional contact Boundary Element Method.
第3章，给出三维弹塑性摩擦接触定解问题的控制方程及本构方程等完整格式及离散格式和依据库仑线性摩擦及塑性流动律的摩擦接触判别条件格式。
Precision band rolling; the Boundary Element Method; the elasto- plasticity contact with friction; existence and uniqueness of the solution; condensation matrix algorithm; network parallel algorithm
高等学校博士学科点专项科研基金；河北省自然科学基金精密板带轧制；边界元法；弹塑性摩擦接触；解的存在唯一性；凝缩矩阵算法；网络并行算法
Actually, piston ring is working under the state of boundary lubrication and the half dry friction.
活塞环实际上是在边界润滑和半干摩擦状态下工作。
To obtain a good prediction of the total engagement, friction measurements in the boundary lubrication regime are still needed.
为了获得一个良好的总的结合数据，边界润滑系统摩擦力测试仍然是需要的。