加速贮存寿命试验及可靠性评估

目的针对工程实际中设备在贮存期间遭受的环境应力种类繁多,而常用的贮存加速寿命试验往往只考虑单应力,不能反映产品真实环境应力问题,提出综合应力下的步退应力加速贮存寿命试验方法。方法设备级电子产品由于其组成结构复杂,失效模式难以确定,引入反映综合应力的可靠性增长理论,对试验数据采用Duane模型进行增长趋势检验,得到加速因子和加速模型,进一步得出正常应力下的设备寿命。结果综合环境下步退应力加速贮存寿命试验方法可综合考虑各环境应力对设备寿命的影响,采用可靠性增长理论评估可有效评估失效模式复杂的设备寿命特征。结论该方法可以综合考虑各环境应力对设备的影响,更能反应设备的振动环境条件,采用可靠性增长理论对加速试验进行评估可避免因失效模式不明确而无法评估的弊端。

Accelerate Storage Life Test and Reliability Evaluation

Objective To propose a step-back stress accelerated storage life test method under comprehensive stress in view of various environmental stress suffered by equipment during storage in engineering practice, and the commonly used accelerated storage life test only considers single stress and cannot reflect the real environmental stress of products. Methods Due to the complex composition and structure of equipment-level electronic products, it was difficult to determine the failure mode. The reliability growth theory reflecting comprehensive stress was introduced to test the growth trend of test data with the Duane model. The acceleration factor and acceleration model were obtained, and the equipment life under normal stress was further obtained. Results The step-back stress accelerated storage life test method could comprehensively consider influences of various environmental stresses on the equipment life, and the reliability growth theory could be used to evaluate the equipment life characteristics with complex failure modes effectively. Conclusion This method can comprehensively consider the impact of various environmental stresses on the equipment, and better reflect the environmental conditions caused by the vibration of the equipment. Evaluating the accelerated test with the reliability growth theory can avoid the disadvantages of not being able to evaluate due to the unclear failure mode.