Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/51956
Title: Effect of Drilling Parameters and Tool Geometry on the Thrust Force and Surface Roughness of Aerospace Grade Laminate Composites
Authors: Bolat, Ç.
Karakılınç, U.
Yalçın, B.
Öz, Y.
Yavaş, Ç.
Ergene, B.
Erçetin, A.
Akkoyun, Fatih
Keywords: carbon fiber reinforced polymers
delamination
drilling
surface roughness
thrust force
Carbon fiber reinforced plastics
Cutting
Drills
Infill drilling
Laminated composites
Carbon fibre reinforced polymer
Carbon-fibre reinforced plastics
Cutting speed
Delamination factor
Drilling parameters
Drilling tests
Feedrate
Three-level
Thrust forces
Type II
Surface roughness
Publisher: Multidisciplinary Digital Publishing Institute (MDPI)
Abstract: Carbon fiber-reinforced plastics (CFRPs) have been specially developed to enhance the performance of commercial and military aircraft because of their strength, high stiffness-to-density ratios, and superior physical properties. On the other hand, fasteners and joints of CFRP materials may be weak due to occurring surface roughness and delamination problems during drilling operations. This study’s aim is to investigate the drilling characterization of CFRPs with different drilling parameters and cutting tools. Drilling tests were performed with the Taguchi orthogonal array design (L18: 2^1 3^3). Tests were conducted with three levels of cutting speed (15, 30, 45 m/min), three levels of feed rate (0.05, 0.1, 0.2 mm/rev), two levels of drill diameter (3 and 5 mm), and three different types of drills (two twist drills with a point angle of 138° and 120° and one brad drill). Thrust forces were recorded during drilling tests, and afterwards surface roughness and hole delamination were measured. Obtained results were analyzed with Taguchi and two-way ANOVA. The general tendency was that low cutting speed, high feed rate, and small diameter drill caused an increase in thrust force. Surface roughness decreases with increasing tool diameter, decreasing feed, and cutting speed. Delamination factors of the samples dropped depending on decreasing thrust force levels. Remarkably, it is possible to control the delamination factor values via better surface quality. The brad drill and larger point angle have a negative effect on the drilling quality of CFRPs. According to all results, the cutting speed of 45 m/min and feed rate of 0.05 mm/rev using a type II drill having a 120° point angle and 5 mm diameter (12th trial) and the cutting speed of 30 m/min and feed rate of 0.05 mm/rev using a type II drill having a 120° point angle and 3 mm diameter (2nd trial) were determined as optimum drilling conditions. © 2023 by the authors.
URI: https://hdl.handle.net/11499/51956
https://doi.org/10.3390/mi14071427
ISSN: 2072-666X
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Teknoloji Fakültesi Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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