基于Weibull分布的疲劳加速腐蚀因子分析

考虑预腐蚀对飞机结构疲劳寿命的影响,建立了疲劳寿命服从Weibull分布的 加速腐蚀因子确定方法.假设预腐蚀疲劳寿命服从Weibull分布,特征寿命随时间呈指数规 律变化,推导得到了以疲劳寿命为腐蚀量的加速腐蚀因子表达式,以及在工程常用的时间范 围内加速腐蚀因子与腐蚀时间无关的结论;进行了相关参数估计,建立了加速腐蚀 因子的估计方法,得到了加速腐蚀因子估计量的近似分布,对其进行了统计分析.

Acceleration corrosion factor analysis for fatigue critical components based on the Weibull distribution

Accounting for the pre-corrosion influence on the fatigue life,the statistical analysis of acceleration corrosion factor for accelerated aging test to service or natural exposure environment on fatigue critical components was performed.Assuming the pre-corrosion fatigue life follows the two-parameter Weibull distribution,and the relationship between the characteristic life and the pre-corrosion time can be expressed as an exponential model,the equations for acceleration corrosion factor were established.The acceleration corrosion factor was proved to be a constant regardless of reliability degree and pre-corrosion time.The approximate distribution of the acceleration corrosion factor estimate was gained,so the confidence intervals of the acceleration corrosion factor for LY12CZ aluminum alloys specimen were obtained.