Abstract
The intermediate case splitter (splitter) is a kind of thin-walled welded component installed on the aeroengine. During the service of the aeroengine, the crack initiation and growth occurred on the weld joints of the splitter, which seriously threatens the safe operation of the aeroengine. In this study, the fracture morphology characteristics of the crack surface are analyzed in details by scanning electron microscope (SEM), based on the observation of the macro crack of the splitter. The results show that the cracks always appear in the welding zone at the edge of the outer panel of the splitter. The fracture morphology analysis shows that there are obvious fatigue striations in the stable crack growth zone. The microstructure defects such as pores and lack of fusion formed by welding are the direct causes of the fatigue failure of the splitter. In addition, the stress analysis of the splitter under random vibration load shows that the stress concentration in the V-shape slot of the splitter can promote the initiation of fatigue cracks.
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