中文摘要：

传统的可靠性筛选方法以产品是否失效为筛选判据，对于高可靠长寿命产品，必须将产品长时间置于筛选应力下，对于一批产品中的合格品会产生较为严重的不良影响。针对退化失效型产品，研究了不合格品与合格品的性能退化规律：在筛选应力下，相对于合格品，不合格品性能参数的变化速率相对较快，从而使得性能参数在试验检测过程中形成明显的双峰分布。论文提出了基于产品性能退化特性的可靠性筛选技术，在保证筛选成品率和产品可靠度的前提下，通过合理选取筛选试验持续时间和筛选阈值，实现了缩短试验时间和减少筛选应力对合格品的不良影响的目的，最后通过实例说明了方法的有效性。

英文摘要：

The existing Environmental-Stress-Screen（ESS）plans precipitate defects by stressing all products for specified durations. For high reliability and long life products,the plans usually require long screen durations to allow nearly all defective items to fall,and thus generate excessive aging effects of good items. For some products, failures are defined in terms of performance characteristics exceeding their critical values. This paper describes the principles of using degradation measurements of performance characteristics to screen the products. In an ESS, the performance characteristics of defective items degrade considerably faster than of good ones, yielding a bimodal distribution of the characteristics. As screen duration increases, the 2 modes of the distribution shift apart. It is possible to find a tightened critical value to weed out the defective items before they fail. This paper, based on principle, by choosing optimal screen durations and tightened critical values, designs the optimal screen plans which meet the screening efficiency and which simultaneously meet the reliability requirement. Because the ESS regime of this paper allows defective parts to be screened out before they fail, the developed ESS plans can shorten screening duration and alleviate aging effects of good products. A numerical example is given to illustrate the effectiveness of the method.