An Evaluation Method of the Crack-initiation Life of Engine's Turbo-disk
Zhang Li,Wang Gang,Lu Nianchun,Cheng Jin
(Department of Astronautic Engineering and Mechanics, Harbin Institute of Techno logy, P. O. Box 344 , Harbin 150001, China)

Abstract: This paper provides a new damage parameter for evaluating the crack- initiation life of engine's turbo-disk, which combines the critical plane theory, shear stress work, the micro-mechanism of fatigue damage. Based on this parameter, the relationship between the damage parameter and fatigue cycles is derived, and a fatigue damage accumulation model is developed to evaluate the fatigue life using finite element method and numerical simulation.
Keywords: turbo-disk, fatigue damage parameter, fatigue damage accumulation model, life estimation.