Design of reliability qualification test based on acceleration model

Conventional reliability qualification test takes a hardly acceptable test time when reliability requirement of the test product is extremely high. It is of great significance to shorten the test time while the product reliability can still be effectively verified. In this paper, we propose the method of reliability qualification with harsher thermal cycle replacing nominal thermal cycle in conventional reliability qualification test. Firstly, the acceleration model deduced from Arrhenius reaction rate model is used to accelerate the elevated temperature soak duration. Secondly, an innovative acceleration model which indicates the effect of mechanical and physical reactions as well as expansion and contraction in heating and cooling phase is provided. After the acceleration factor is derived from acceleration model, the reliability qualification test with harsher thermal cycle can be designed. Both the one cycling test profile and test cycle number are obtained. An example is given to illustrate the concrete calculation process of the method proposed. The result shows that the required test time is considerably diminished.