Comparison and Verification of Acceleration Factor of Temperature Cycle Test by Empirical Formula and CAE Analysis

It is known that the fatigue life of automotive electronic components ensures safety of the system. Electronic components are joined by the solder but this joint is one of the vulnerable point in the electronic components. Therefore, in order to know the life of electronic components [1], it is needed to investigate the reliability of solder joints. However, it takes an enormous amount of time to actually use parts and determine the life under actual use conditions. In order to shorten the testing time, there is a method called accelerated test [2]. This test can evaluate the life by calculating the acceleration factor using empirical formula but there are multiple formulas for the acceleration factor in this accelerated test. Therefore, it must have known which empirical formula can calculate the relationship between accelerated test and actual use conditions more accurately. Additionally, it is necessary to consider whether it is possible to discuss using the same empirical formula.In this study, using the Computer Aided Engineering models, the fatigue crack initiation, propagation, and fracture are reproduced under various temperature conditions to determine the acceleration factor. Then, the accuracy of the empirical formula is verified by comparing it with the acceleration factor obtained from the empirical formula.