表面特性对纯滑弹流油膜形状和摩擦力的影响的试验研究  

Experimental Investigation of Effect of Surface Property on Film Shape and Friction in EHL

作　　者：付忠学[1,2] 郭峰[2] 黄柏林[1] 

机构地区：[1]香港城市大学机械及生物医学工程学系 [2]青岛理工大学机械工程学院摩擦学研究所,山东青岛266033

出　　处：《摩擦学学报》2013年第2期112-117,共6页Tribology

基　　金：国家自然科学基金项目(51275252);国家重点基础研究发展计划(973计划)(2011CB706602)资助~~

摘　　要：针对界面滑移效应可能产生较低的摩擦力,采用具有不同表面浸润性的玻璃盘,进行了纯滑弹流润滑试验.在采用SiO2镀膜玻璃盘的球-盘接触高聚物纯滑润滑试验中,从弹流到动压润滑的摩擦系数曲线呈现不同于传统Stribeck曲线的两个拐点.两个拐点分别与凹陷出现及弹性变形消失相关联.在较低载荷下,不同盘表面产生相近的干涉图像和摩擦系数曲线,高聚物的非牛顿效应产生的表观滑移可能是入口凹陷及非典型摩擦系数曲线的主因;在较高载荷下,盘滑试验中铬盘产生的摩擦系数和油膜厚度均较SiO2盘低,具有较低表面能的铬盘产生的界面滑移被认为是产生较低摩擦系数的主因.Considering that boundary slip effect may produce lower friction force,pure sliding EHL experiment was conducted using glass discs with different wettability.For steel ball against SiO2-Cr-coated glass disc under lubrication of high viscosity lubricant PB2400,friction curve from EHL to HL had two inflection points and this was significantly different from traditional Stribeck curve.The two inflection points were related to the presence of dimple and disappearance of elastic deformation.Under lower load,two kinds of glass disc surfaces produced similar interference images and friction curves and the apparent slip of non-Newtonian effect of polybuttene might be the main cause of inlet dimple and abnormal friction curve.Under higher load,Cr-coated disc surface produced lower film thickness and friction force than SiO2-coated disc surface and it is postulated lower surface energy of Cr surface lead to smaller friction and bigger contact slope.

关 键 词：弹流润滑 STRIBECK曲线 摩擦系数 界面效应 非牛顿效应 

分 类 号：TH117.2[机械工程—机械设计及理论]