疲劳裂纹扩展寿命的可靠性及灵敏度分析

Reliability and sensitivity analysis on growth life of fatigue crack

将影响结构疲劳裂纹扩展寿命的不确定因素视为随机变量,用随机有限元和可靠性分析理论,从概率论和数理统计的角度出发对含裂纹平面结构的断裂过程进行了可靠性分析。通过疲劳裂纹扩展寿命可靠度对随机变量的灵敏度分析,可以看出不同因素对疲劳裂纹扩展寿命可靠度影响的差别很大。

For the effect of some uncertainties such as material, geometry, loading, etc, the growth life fatigue crack appears to be scattered. All these uncertainties were expressed by basic random variables. From the aspects of probability theory and mathematical statistics, an estimation method of the reliability analysis on growth life of fatigue crack was proposed based on stochastic finite element method and reliability analysis. Sensitivity of fatigue crack were studied on the reliability. factors were obtained and the effects of parameters on reliability growth life The results show that different parameters have much different influences