The Optimization Method of Component Multi-stress Reliability Enhancement Test Based on Fuzzy Theory

In the development and production stages of components, the reliability enhancement test (RET) has been used as one of the necessary test methods to identify weak links in product design and production. Due to the diversity and the complex environment of components, how to reduce the cost of RET and stimulate the potential defects of the device products quickly has become the primary research goal. In this paper, a design method of component multi-stress RET based on fuzzy theory is presented. First, we use the FMECA to obtain the sensitive stresses of components. The sensitive stresses order is measured by the fuzzy theory. Second, we use the double-crossed stepwise stress method to verify the sensitive stresses sequence. Third, the stress combination of RET is determined by using the fuzzy matrix calculation results and the data distribution characteristics. Fourth, using the failure physics theory and orthogonal experiment methods to optimize the design of RET. Finally, a case study with A/D converter is carried out to verify the above methods. The optimization method of multi-stress RET is helpful to quantify different factors and quickly excite potential defects of components by using failure physical simulations.