基于性能退化分析的电连接器可靠性评估

某型电连接器具有寿命长、可靠性高的特点,传统的基于失效寿命数据的可靠性评估方法行不通。提出了基于性能退化分析的可靠性评估方法,给出了进行评估的一般步骤,并以温度为加速应力设计了该型电连接器的加速退化试验。分析了电连接器的接触失效机理,进而推导出退化模型,估计出了样品的伪寿命值。利用Anderson-Darling统计量确定寿命分布类型为对数正态分布,对寿命分布函数和Arrhenius加速方程的参数值进行了极大似然估计,推导出了该型电连接器在工作温度下的可靠度函数,得出t0.9为244 240h。

Reliability assessment of electrical connectors based on performance degradation analysis

Traditional reliability assessment methods,which are based on failure lifetime data,cannot evaluate the reliabilities of electrical connectors with long-lifetime and high reliability characters.A reliability assessment method based on performance degradation analysis is proposed, the general steps which are used to implement evaluation are given and an accelerated degradation test is designed by taking temperature as accelerated stress.By analyzing the degradation failure mechanism of electrical connectors,its degradation model is deduced and then the pseudo lifetime evaluations of the samples are obtained.Lognorm distribution is chosen as the best lifetime distribution by means of Anderson-Darling,and parameters of lifetime distribution function and Arrhenius equation are calculated by MLE.Eventually,the reliability function of the electrical connectors working in operational temperature is deduced and t0.9 is 244240 hours.