Quantitative assessment approach of RET based on interference model
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摘要: 介绍了国外最新可靠性强化试验基本概念、各种应力极限分类和试验过程,阐述了强化试验的基础理论.针对可靠性强化试验无法进行定量分析的问题,引入应力强度干涉模型理论,运用干涉模型分析了强化试验中的产品失效原因,即试验环境应力大于产品工作极限应力.通过分析工作极限应力与产品实际使用环境应力的相互关系,推导了利用强化试验数据计算产品可靠度的相关公式,将定量分析引入强化试验中.并举具体计算实例说明了该方法的可行性.在此基础上,运用干涉模型和可靠度计算公式,分析了强化试验提高产品可靠性的2种基本途径:改进设计和提高工艺水平,进一步阐述了可靠性强化的基本原理.Abstract: RET(reliability enhancement testing) is the most advanced technology in western countries. RET’s concept, process and stress limit classification were introduced. The basic theory of RET was explained. Interference model was introduced into RET, to settle the problem that RET couldn’t be analyzed quantitatively. The failure mechanism occurred in RET was analyzed by using interference model. Because the test stress was higher than the operation stress limit of product, almost all products in RET failed. By analyzing the interdependence between the operating stress found in RET and the stress in actual operation environment, the formula for reliable probability was deduced based on interference model. Then an example was given to explain this approach’s feasibility. RET could improve the reliability of products by improving the quality of design and manufacturing process. By using the interference model and the deuced formula, two ways of improving the reliability of products were analyzed. And also the basic principle of RET was explained based on the model.
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