基于面面接触结构的高温微动疲劳寿命预测研究  

Research on High Temperature Fretting Fatigue Life Prediction Based on Surface-to-surface Contact Structure

作　　者：杨博文 高强 王硕 霍军周[1] YANG Bowen;GAO Qiang;WANG Shuo;HUO Junzhou(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024)

机构地区：[1]大连理工大学机械工程学院,大连116024

出　　处：《机械工程学报》2023年第18期165-174,共10页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52275236);辽宁省“揭榜挂帅”重大科技专项(2022JH1/10400031)资助项目

摘　　要：航发叶片与轮盘连接处长时小幅相对位移将产生微动疲劳,交变载荷受温度效应对结构造成严重损伤。现有疲劳寿命模型预测未能充分考虑高温对微动疲劳的影响,预测结果与工程实际寿命存在较大差距。因此,需建立一种考虑温度效应微动疲劳寿命预测模型。以航空发动机燕尾榫结构为研究对象,设计高温燕尾榫微动疲劳试验,探讨高温对微动疲劳损伤的影响。基于燕尾榫的高温微动疲劳试验,探究高温对其微动疲劳损伤的影响机制,提出一种考虑温度效应的燕尾榫高温微动疲劳寿命预测模型,并通过试验验证准确性。结果表明:所提模型与试验数据之间具有良好的相关性,证明该模型具有良好的预测精度,其预测误差小于19.24%,预测结果位于±1.5倍分散带内,为航空发动机燕尾榫的结构优化改进与损伤容限设计提供理论依据。The small relative displacement of the connection between the aero-engine blade and the wheel disc for a long time will cause fretting fatigue,and the alternating load will cause serious damage to the structure due to the temperature effect.The existing fatigue life model prediction fails to fully consider the impact of high temperature on fretting fatigue,and there is a large gap between the prediction results and the actual engineering life.Therefore,it is necessary to establish a fretting fatigue life prediction model considering the temperature effect.Taking the structure of the aero-engine dovetail as the research object,the fretting fatigue test of high temperature dovetail tenon is designed,and the influence of high temperature on the fretting fatigue damage is discussed.Based on the high temperature fretting fatigue test of dovetail joints,the influence mechanism of high temperature on its fretting fatigue damage is explored,and a high temperature fretting fatigue life prediction model considering temperature effect is proposed,and the accuracy is verified by experiments.The results show that the proposed model has a good correlation with the experimental data,which proves that the model has good prediction accuracy.Optimization improvement and damage tolerance design provide theoretical basis.

关 键 词：温度效应 微动疲劳 寿命预测 燕尾榫 

分 类 号：TG156[金属学及工艺—热处理]