Abstract：According to the characteristics of engine structure materials under high frequency cyclic loading, the crack propagation of nickel-based alloy was studied using ultrasonic fatigue experimental system. Considering the temperature rising effect on the fatigue crack propagation under high frequency loading, the temperature changes were recorded in the fatigue test. The main effect of temperature rising was focused on changing of dynamic modulus of elasticity and coefficient of thermal expansion of nickel-based alloy. Based on these, the correctional stress intensity factor was calculated in keeping with the real experimental conditions. Then, the research on how the temperature rising influences the ultrasonic fatigue crack propagation was carried on, meanwhile, based on the current existing models, a model which considering temperature rising of ultrasonic fatigue crack propagation was given to improve the life prediction theory of fatigue crack propagation.
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