GH4169机匣安装座环形焊缝多轴疲劳寿命预测模型  

Prediction model of multiaxial fatigue life of circular weld of GH4169 casing mounting seat

作　　者：吴振豪 刘鹏飞 WU Zhenhao;LIU Pengfei(AECC Guiyang Engine Design Research Institute,Guiyang,550081,China)

机构地区：[1]中国航发贵阳发动机设计研究所,贵阳550081

出　　处：《焊接学报》2024年第7期101-108,共8页Transactions of The China Welding Institution

摘　　要：针对航空发动机机匣安装座焊接结构在复杂载荷作用下的多轴疲劳寿命研究,提出了一种基于临界平面法的多轴疲劳寿命预测模型研究方法.首先,根据机匣安装座环形焊缝的结构特征,设计了一种可以实现双轴拉伸的疲劳试验件,分别在不同载荷级和双轴比下进行双轴拉伸疲劳试验,然后,基于临界平面法的Findley和Matake准则下分别预测疲劳寿命.结果表明,两种准则并不能很好地预测不同双轴比下的机匣安装座环形焊缝疲劳寿命,通过对Matake准则下的疲劳寿命预测模型进行调整,引入双轴比γ对其进行修正,最终建立了能综合考虑不同双轴比影响的双轴拉伸疲劳寿命预测模型,预测结果均在3倍分散带以内.Aming at multiaxial fatigue life prediction model research on the welded structure of aviation engine casing mounting seat under complex loads,a fatigue life prediction model based on critical plane method is proposed.Firstly,based on the structural characteristics of circular weld of the casing mounting seat,a fatigue biaxial tensile specimen was designed,and biaxial tension fatigue tests were conducted at different load levels and biaxial ratios.Then,based on the critical plane method of Findely and Matake criteria,the fatigue life was predicted separately,and the results showed that the two criteria could not effectively predict the fatigue life of circular weld of the casing mounting seat under different biaxial ratios,by introducing the biaxial ratioγto adjust the fatigue life prediction model under the Matake criterion,a biaxial tensile fatigue life prediction model was established that can comprehensively consider the effects of different biaxial ratios,and the predicted results are within a 3-fold dispersion band.

关 键 词：机匣安装座 环形焊缝 多轴疲劳 临界面法 

分 类 号：TG405[金属学及工艺—焊接]