摘要
提出了考虑失效相关性的同应力多危险部位轮盘应变疲劳寿命可靠度分析方法.引入广义强度和广义应力建立轮盘应变疲劳寿命可靠性模型,采用H-L法计算轮盘单失效部位可靠度.针对发动机轮盘常存在同应力多危险部位的特点,当考虑多失效部位相关性时,采用Hohenbichler M积分法对轮盘疲劳寿命可靠度进行计算.最后通过某轮盘应变疲劳寿命分析说明该方法的有效性.探讨了轮盘失效功能函数相关系数和应变寿命模型中材料随机变量相关系数关系,以及轮盘失效功能函数相关系数和轮盘疲劳概率寿命规律.
In order to calculate strain fatigue life reliability of a disk more accurately, considering the failure correlation of the disc with multi critical sites in the same stress level, a method for analysis of strain fatigue life reliability was proposed. A strain-fatigue life relia bility interfere model based on generalized strength and generalized stress was set up, and HL method was used to evaluate the fatigue life reliability at a failure site. As a fan disk usual ly contains multi critical sites in the same stress level,the strain-fatigue life reliability of the disk concerning multi failure sites correlation was acquired through the Hohenbichler＇s integral method. Finally, an example of strain-fatigue life analysis of the disk was given to dem onstrate the efficiency of the method. The relationship of the correlation coefficient between the failure functions and the correlation coefficient between random variables in the stain life model is discussed. Also the relationship of the correlation coefficient between the failure functions and the probabilistic fatigue life of the fan disk concerning multi failure sites corre lation is illustrated.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2008年第11期2016-2020,共5页
Journal of Aerospace Power
关键词
轮盘
应变寿命
多危险部位
相关性
系统可靠度
disk
strain life
multi critical sites
correlation
system reliability
