本构模型对GH4169缺口件蠕变变形响应计算结果的影响  

Influence of constitutive model on calculation results of creep deformation response of notched specimen of GH4169 alloy

作　　者：胡贤明 嵇大伟 庄书颖 胡绪腾[1] HU Xianming;JI Dawei;ZHUANG Shuying;HU Xuteng(College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空材料学报》2021年第5期69-77,共9页Journal of Aeronautical Materials

摘　　要：针对航空发动机高温构件蠕变变形失效问题,基于大变形有限元分析方法,采用弹塑性耦合蠕变本构模型对650℃下GH4169合金光滑和缺口平板试件的弹塑性和蠕变变形响应进行计算,重点分析蠕变本构模型对试件蠕变变形响应和持久寿命的影响。研究结果表明:基于大变形有限元分析的方法能较好地预测三种缺口平板试件的弹塑性变形和极限强度,极限强度预测误差均在±3%以内;三种蠕变本构模型对GH4169缺口平板试件蠕变变形响应和持久寿命的大变形有限元预测效果不一,采用θ参数法模型可较为准确地预测缺口试件的持久寿命,预测误差在±2倍分散带以内,而采用修正蠕变模型和Batsoulas模型可较为准确地预测蠕变前两个阶段的变形。In view of the creep deformation failure of areo-engine high temperature components,the elastoplastic and creep deformation response of GH4169 alloy smooth and notched plate specimens at 650℃ is calculated using elastoplastic coupled creep constitutive model based on the large deformation finite element analysis,to explore the influence of creep constitutive model selection on creep deformation response and creep rupture life calculation.The results show that the elastoplastic deformation response of notched plate specimens is well predicted by large deformation analysis,the elastoplastic deformation and ultimate strength of the three notched plate specimens are all well predicted,and the prediction error of ultimate strength is within±3%.Three creep models have different predictive effects on creep response and creep rupture life of notched plate specimens under large deformation finite element analysis.The θ-projection model is found to predict the rupture life of notched specimens more accurately within the factor of ±2.While the modified creep model and the Batsoulas model can predict the deformation of the first two creep stages more accurately.

关 键 词：发动机高温构件 大变形有限元分析 蠕变本构模型 持久寿命 GH4169合金 

分 类 号：V231.91[航空宇航科学与技术—航空宇航推进理论与工程]