Abstract
During its operational life automotive junction box fuse faces various challenges such as severe vibration, impact, temperature, humidity, etc. Accordingly, it demands high durability, thermal resistance, and humidity resistance. Therefore, to evaluate its life cycle establishment of measurement method is needed. To evaluate life cycle of junction box fuse, generally two exciters are needed to excite each side of the fuse separately. However, there are some difficulties such as high equipment cost, high maintenance and repairing cost, setting difficulty, etc., that limit its use. In this experimental paper we propose a durability measurement method that uses only one exciter. Also, to validate our method we performed fatigue life cycle experiment on fuse. The acceleration difference between ends of fuse which occurs due to interior design of fuse box is a primary factor behind its life cycle reduction. Also, the low frequency vibration that occurs in the engine seriously affects its durability. The stress analysis of the fuse is performed for finding maximum stress concentration, and its natural frequencies and mode shapes are calculated by finite element analysis. Fatigue life cycle is evaluated from the data measured in accordance with acceleration differences between left and right ends of the fuse. Excitation range and acceleration amplitude is set, and failure position of fuse is predicted and verified by simulation results. Hence, the experimental and simulation results validate our proposed measurement method and the principle of one-side excitation measurement.
