Delamination of carbon fiber reinforced plastics: analysis of the drilling method

摘要

Carbon fiber reinforced plastics (CFRPs) are being extensively used in industries like aeronautics. The use of CFRPs in different types of parts requires performing conventional machining operations such as drilling. During the drilling process, the work-pieces can suffer damage in form of delamination. The present study shows an analysis of the delamination at the entrance and exit movements of the drill, evaluating the influence of the feed rate, type of drills and drilling method. The results of the study include the recognition of the influence of the feed rate on the evolution of the delamination, specially, at the entrance movement of the drill. Moreover, in general, the use of diamond drills provides slightly better results than TIN/TiAIN coated drills. Regarding the drilling methods, it was identified better results when using the pre-drilling and standard methods. The results of the sacrificial plate and, specially, the sandwich method are on average the worst of all.