基于加速因子不变原则的失效机理一致性检验

Testing of Failure Mechanism Consistency Based on Principle of Acceleration Factor Constancy

针对加速试验中产品的失效机理是否发生改变的问题,基于加速因子不变原则,研究了工程上应用较为广泛的Weibull寿命分布失效机理一致性的检验方法。将Weibull分布转化为I型极值分布,进而研究极值分布尺度参数的统计检验方法,并采用尺度参数的Ansari-Bradley方法进行检验。结合Arrhenius加速模型,基于最小二乘法估计、回归系数的性质构造t统计量,实现对加速因子与分布参数的统计检验,判别失效机理发生改变的应力。仿真模型验证了所提检验方法的有效性。

To identify whether the product’s failure mechanism in accelerating tests is changing,a testing method of failure mechanism consistency of Weibull life distribution based on the principle of acceleration factor constancy is studied.Weibull distribution is converted to I-type extreme value distribution.A method for statistical testing of the scale parameters in extreme value distribution is studied by using Ansari-Bradley method.By using Arrhenius acceleration model,t statistic is constructed based on the least squares method and characteristics of regression coefficients.Statistical testing of the acceleration factor and distribution parameters is implemented,and the stress under which the failure mechanism will change is distinguished.Simulation results show the effectiveness of the proposed method.