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Taylor 급수를 이용한 Alloy 617 의 장시간 크리프 수명 예측 모델의 적용성
윤송남(Song-Nan Yin),김우곤(Woo-Gon Kim),박재영(Jea-Yeong Park),김용완(Yong-Wan Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Creep life prediction has been commonly used by a time-temperature parameter (TTP) which is correlated to a rupture time and temperature, such as Larson-Miller (LM), Orr-Sherby-Dorn (OSD), Manson-Haferd (MH) and Manson-Succop (MS) parameters. A Taylor series model(T-SM) based on Arrhenius, McVetty and Monkman-Grant equations was newly proposed through a mathematical procedure and in order to reduce the fitting errors the McVetty’s equation was transformed by taking the first three-terms of Taylor series equation. The model parameters were properly determined by means of a technique of maximum likelihood estimation of statistical method, and this model was applied to the creep data of Alloy 617. The T-SM results revealed better agreement than the Eno’s model and the LM parameter one. Especially, it was identified that the T-SM showed a good estimation in predicting the long-term creep life of Alloy 617.