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Title: Ultrasonically-assisted drilling of carbon fibre-reinforced plastics
Author: Makhdum, Farrukh
ISNI:       0000 0004 6351 755X
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2014
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Carbon fibre-reinforced plastics (CFRP) are widely used in aerospace, automobile and other structural applications due to their superior mechanical and physical properties. CFRP outperform conventional metals in high strength-to-weight ratio. Usually, CFRP parts are manufactured near to net-shape;however,machining is unavoidable when it comes to assembly. Drilling the holes are essential to facilitate riveting and bolting of the components. However, conventional drilling (CD) induces different types of damages such as cracking, fibre pull-out, sprintling and delamination due to the abrasive nature, inhomogeneity and anisotropy of CFRP. A novel technique, ultrasonically-assisted drilling (UAD) is hybrid machining technique in which highfrequency (typically above 20 kHz) vibration are superimposed on a standard twist drill bit in axial direction using ultrasonic transducer. UAD has shown several advantages such as thrust force reduction, improving surface quality and lower bur-formation in drilling of conventional metals. UAD has also effectively been used for drilling brittle materials.
Supervisor: Not available Sponsor: Wolfson School of Mechanical and Manufacturing Engineering
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Ultrasonic ; Drilling ; Hybrid drilling ; Carbon fibre-reinforced plastics ; Drilling forces ; Surface roughness ; Circularity ; Delamination ; Ultrasonically-assisted drilling.