变工况条件下角接触球轴承疲劳剥落故障演化加速试验载荷谱研究  

Study on Load Spectrum of Evolution Accelerated Test for Fatigue Spalling of Angular Contact Ball Bearings under Varying Working Conditions

作　　者：邓智铭 黄土地 黄洪钟 尉询楷[3] 王浩[3] DENG Zhiming;HUANG Tudi;HUANG Hongzhong;WEI Xunkai;WANG Hao(School of Mechanical and Electrical Engineering,University of Electronic Science and Technology of China,Chengdu 611731;Center for System Reliability and Safty,University of Electronic Science and Technology of China,Chengdu 611731;Beijing Aeronautical Technology Research Center,Beijing 100076)

机构地区：[1]电子科技大学机械与电气工程学院,成都611731 [2]电子科技大学系统可靠性与安全性研究中心,成都611731 [3]北京航空工程技术研究中心,北京100076

出　　处：《机械工程学报》2024年第13期193-204,共12页Journal of Mechanical Engineering

基　　金：国家科技重大专项资助项目(J2019-IV-0004-0071)。

摘　　要：航空发动机主轴轴承在实际运行中承受着复杂的时变载荷,如何在实验室内,在不改变失效机理的情况下进行主轴轴承的加速寿命试验是重大技术难题,重要原因是在变工况条件下进行航空发动机主轴轴承加速试验缺乏加速试验载荷谱。在此背景下,通过变工况条件下角接触球轴承的疲劳剥落故障演化机理分析,提出疲劳剥落故障演化加速试验载荷谱的研制方法。首先建立考虑温度与润滑的7208AC角接触球轴承的拟动力学模型,求解轴承接触参数。再基于扩展有限元法(Extended finite element method,XFEM),建立轴承滚道表面疲劳剥落故障演化仿真模型。然后,以接触参数为输入,以基于断裂力学分析得到的裂纹扩展速度与方向为迭代更新准则,实现对疲劳剥落故障演化的动态模拟。最后,基于剥落故障演化机理分析结果,插值制订加速因子为1.5的轴承变工况加速试验载荷谱,并利用疲劳剥落故障演化仿真模型对载荷谱的可行性进行验证。结果表明,在所制订的变工况加速试验载荷谱下,轴承的实际疲劳剥落加速因子与理论值相近。所提出的变工况载荷谱制定方法,可为航空发动机主轴轴承的加速试验提供重要的理论依据。Due to the complex load variation of aeroengine mainshaft bearing under actual operating conditions,it is a great challenge to accelerate the test by load spectrum under varying operating conditions in laboratory environment.This complexity becomes more complicated in the accelerated test of aero-engine mainshaft bearing under varying working conditions,and it is difficult to analyze and model the evolution law of fatigue spalling fault of bearing.In order to study and verify the construction method of fatigue spalling failure evolution acceleration test load spectrum,the fatigue spalling failure evolution mechanism of angular contact ball bearings under different load conditions is modeled and analyzed.A quasi-dynamic model of 7208AC angular contact ball bearing considering temperature and lubrication is established,and its contact parameters are solved.Based on the extended finite element method(XFEM),a simulation model of fatigue spalling fault evolution on the surface of bearing raceway is established,and the iterative updating criterion of the simulation model is used to simulate the fatigue spalling fault evolution with the contact parameter as the input and the crack growth speed and direction based on the fracture mechanics analysis.A bearing acceleration test load spectrum with an acceleration factor of 1.5 is developed based on the evolutionary mechanism of spalling fault analysis,and verified by the established simulation model of fatigue spalling fault evolution.The results show that the actual fatigue spalling acceleration factor of bearing is close to the theoretical value under the proposed variable condition acceleration test load spectrum,which can provide important theoretical basis and method support for the acceleration test of aeroengine mainshaft bearing.

关 键 词：拟动力学模型 疲劳剥落 裂纹扩展 有限元分析 加速试验 

分 类 号：TG156[金属学及工艺—热处理]