考虑温度影响的干摩擦接触分子动力学研究  

Molecular dynamics study on dry friction damper with temperature influence

作　　者：许洪斌 樊江[1,2,3] 倪铭 李星星 荆甫雷 XU Hongbin;FAN Jiang;NI Ming;LI Xingxing;JING Fulei(School of Power Engineering,Beihang University,Beijing 100191,China;Beijing Key Laboratory of Aero-Engine Structure and Strength,Beihang University,Beijing 100191,China;Collaborative Innovation Center of Advanced Aero-Engine,Beihang University,Beijing 100191,China;Sichuan Institute of Aerospace Systems Engineering,Chengdu 610100,China;China Aeroengine Research Institute,Beijing 101304,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]北京航空航天大学北京市航空发动机结构与强度重点实验室,北京100191 [3]北京航空航天大学先进航空发动机协同创新中心,北京100191 [4]四川航天系统工程研究所,成都610100 [5]中国航空发动机研究院,北京101304

出　　处：《北京航空航天大学学报》2023年第11期3031-3038,共8页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然基金(51775015);国家科技重大专项(J2019-IV-0002-0069)。

摘　　要：基于多尺度方法对干摩擦行为进行预测已成为当前研究热点。对于航空发动机等高温机械系统,温度对干摩擦行为影响至关重要。针对高温影响下微动界面摩擦行为开展分子动力学建模与分析,研究不同温度下微凸体的切向碰撞过程;考虑温度的升高使摩擦界面微凸体黏着作用增强,提出不同于赫兹接触理论预测的真实面积计算方法;基于所建的分子动力学模型和G-W接触模型,研究不同温度下接触面的摩擦系数,与实验测量的摩擦系数结果吻合,验证所提方法的正确性。对于在高温环境下接触、摩擦及微动等界面力学问题的研究提供了可借鉴的方法,同时为高温旋转机械动力学多尺度方法提供了可参考的解决手段。The prediction of friction factors based on multi-scale methods has become a research hotspot.The influence of temperature is the main issue for mechanical systems that operate at high temperatures,such as aero-engines.In this paper,we propose a novel method for predicting friction factors based on molecular modeling and the contact force under the influence of different temperatures.Considering that the increase in temperature enhances the adhesion of the micro convex body,a real area calculation method different from Hertz contact theory is proposed.The correctness of the proposed method is verified by comparing it with the experiment.The results show that the increase in temperature leads to the enhancement of adhesion of the micro convex body at the rough face.Real contact area is bigger than what the Hz contact theory predicts when adhesion is high due to the substantial plastic deformation of the micro convex body.On the other hand,it also leads to the attenuation of the mechanical properties of materials.With the increase in temperature,the tangential and normal contact forces decrease.Based on the multi-scale method,we provide a feasible research scheme for the prediction of friction factors of a high-temperature machine.

关 键 词：多尺度 分子动力学 摩擦表面 G-W接触模型 航空发动机 

分 类 号：V214.1[航空宇航科学与技术—航空宇航推进理论与工程] TH117.1[机械工程—机械设计及理论]