杨萍,崔金磊,刘晓玲,杨沛然.对基于恢复时间的剪稀流变模型的进一步探讨及其对squalane油品流变特性的模拟[J].摩擦学学报,2018,(1):101~107
对基于恢复时间的剪稀流变模型的进一步探讨及其对squalane油品流变特性的模拟
A Further Investigation on the Shear Thinning Rheology Model Based on the Time of Recovery and a Simulation of the Rheological Behavior of Squalane
投稿时间:2017-05-18  修订日期:2017-08-04
DOI:10.16078/j.tribology.2018.01.013
中文关键词:  恢复时间  流变  剪稀  摩擦系数  极限剪应力  热弹流润滑
英文关键词:recovery time  rheology  shear thinning  friction coefficient  limiting shear stress  thermal elastohydrodynamic lubrication
基金项目:国家自然科学基金项目(51305220,51475250)和山东省自然科学基金项目(ZR2014JL037)资助
作者单位E-mail
杨萍 青岛理工大学 机械工程学院, 山东 青岛 266520 yp_qingdao@163.com 
崔金磊 青岛理工大学 机械工程学院, 山东 青岛 266520  
刘晓玲 青岛理工大学 机械工程学院, 山东 青岛 266520  
杨沛然 青岛理工大学 机械工程学院, 山东 青岛 266520  
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中文摘要:
      本文作者前期基于球-杆变形后恢复到原状态的时间,建立了新的形式较简单的流变模型,并模拟了黏度较高的聚合油PAO 650的摩擦系数曲线. 本文中将该模型的应用范围进行了推广,模拟了黏度较低的squalane油品的流变特性. 把该流变公式应用到点接触热流变弹流润滑的数学模型中,通过与试验测得的摩擦系数的比较确定了使用该模型时squalane油品的待定参数值,进而得到了点接触热流变弹流润滑的完全数值解. 结果表明:解得的压力、膜厚和温度的变化规律均符合预期,且摩擦系数曲线与试验结果整体吻合性较好. 新流变模型对高、低黏度的油品均能得到合理的流变特性曲线,说明作者的基于恢复时间的流变模型具有一定的正确性和可应用性. 另外,由新模型计算得到的squalane油品的剪应力曲线呈现出一近似水平段,这也在一定程度上解释了流变试验文献中多次提到的极限剪应力现象.
英文摘要:
      The authors of this paper have proposed recently a new rheological model based on the recovery time of the rod-ball deformation. The new model had a relatively simple form, however, could predict the friction coefficient curves of the high viscosity lubricant PAO 650 quite accurately. In this study, the application of this model was extended to predict the rheological features of a low viscosity lubricant, that is, squalane. Using the formula of this model to the point contact thermal elastohydrodynamic lubrication, full numerical solutions of squalane were obtained to determine the rheological parameters from the comparison between the numerical and experimental data of the friction coefficients. Results indicate that the solved pressure, film thickness and temperature were reasonable as expected, and the curves of the friction coefficients obtained theoretically and experimentally were in good agreement. The new rheological model, therefore, was demonstrated to be accurate enough for both high viscosity and low viscosity oils, that is, the correctness and applicability of the model based on the time of recovery were validated. In addition, there was an approximately horizontal segment in the curves of the shear stress obtained from the new model for squalane, which explained theoretically, to some extent, the limiting shear stress phenomenon reported in the experimental results of the rheological study in the literature.
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