首页|Experimental investigation and life prediction for the load spectrum with flight mission characteristics on a P/M superalloy
Experimental investigation and life prediction for the load spectrum with flight mission characteristics on a P/M superalloy
Experimental investigation and life prediction for the load spectrum with flight mission characteristics on a P/M superalloy
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NETL
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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/Ⅳcyclic 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.
NETL
NSTL
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