关键词: 航空发动机;涡轮盘;应力松弛;蠕变疲劳;可靠性分析

Abstract: Reliability analysis method for creep-fatigue life of turbine discs was proposed with effect of the scatter of material creep strain model parameter and stress relaxation.Firstly,creep strain probabilistic model was proposed.Secondly,the response surface method was used to regress creep damage function and fatigue damage function.Then,Monte-Carlo method was used to simulate the distribution of total damage and reliability.At the same time,a method for life estimating with given reliability and two convenient creep-fatigue life reliability analysis method for turbine discs with effect of stress relaxation was proposed.Finally,a numerical example was given to demonstrate the efficiency and accuracy of the method.

Key words: Aircraft engine;Turbine Wheel;Stress relaxation;Creep fatigue;Reliability analysis