Experimental investigation and life prediction for the load spectrum with flight mission characteristics on a P/M superalloy  

作　　者：Renjie JIANG Xiaoguang YANG Muwei CHENG Jia HUANG Duoqi SHI 

机构地区：[1]School of Energy and Power Engineering,Beihang University,Beijing 100191,China [2]Research Institute of Aerospace Technology,Central South University,Changsha 410083,China

出　　处：《Chinese Journal of Aeronautics》2025年第3期403-412,共10页中国航空学报(英文版)

基　　金：supported by the National Science and Technology Major Project of China(No.J2019-IV-0017-0085);the National Natural Science Foundation of China(Nos.12172021,52205177);the Natural Science Foundation of Hunan Province,China(No.2021JJ40741).

摘　　要：The service load on high temperature rotating components of aero-engines generally exhibits flight mission characteristics. The general shape of the load spectrum is that Type III/IV cyclic loading and creep loading are superimposed on Type I cyclic loading. Meanwhile, the sequence of the Type III/IV cyclic and creep loading varies with mission. This work performed load spectrum test with this characteristic on the Ni-based alloy FGH96. Then a life prediction method was developed based on the Chaboche fatigue damage accumulation model and a modified time fraction model. Creep followed by Fatigue (C-F) test was carried out to reveal the creep-fatigue interaction and calibrate parameters. The results show that most test results fall within the 2-fold deviation band. The sequence of creep-fatigue loading within the load spectrum exhibited a limited effect on life. Finally, simplified methods were developed to improve analysis efficiency, and cases where simplified methods could replace the proposed method were discussed.

关 键 词：Load spectrum Life prediction Flight mission Loading sequence Niclel alloys 

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]