摘要
从概率意义上对寿命和应力之间的关系作了探索性研究。为了根据寿命和应力之间的概率相关性建立加速寿命模型,假设在给定应力条件下元件寿命服从指数分布,根据二维指数条件分布的定义和特性推导出一种BEC加速寿命模型。为了检验BEC模型的有效性,利用一组加速寿命试验数据,对BEC模型、Arrhenius模型、逆幂率模型进行了对比分析。结果表明,在加速应力范围,BEC模型能够正确描述寿命与应力之间的关系,与Arrhenius模型、IPL模型具有同等效力;而在正常应力范围,BEC模型的寿命外推精度低于Arrhenius模型和IPL模型。
To establish an accelerated life model based on the probabilistic correlation between lifetime and stress, an accelerated life model, named bivariate exponential conditional (BEC) accelerated life model, is derived according to the definition and properties of BEC distribution. Experimental data is employed to valid the BEC model. The results indicate that the BEC model can describe the relationship between the lifetime and stress properly in the accelerated stress domain compared with the Arrhenius and inverse power law (IPL) models, however, the life-extrapolation accuracy of the BEC model is a little lower than that of the Arrhenius and IPL models.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2009年第3期455-458,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(50775026)
国家863计划(2007AA04Z403)
四川省科技支撑计划(07GG012-002)
甘肃省教育厅科研基金(0603B-06)
关键词
加速寿命:二维指数条件分布:模型建立:相关方法
accelerated life
bivariate exponential conditional distribution
model buildings
correlationmethods
作者简介
安宗文(1968-),男,博士生,副教授,主要从事结构可靠性分析方面的研究.