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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/14721

Title: Ultrasonically-assisted drilling of carbon fibre-reinforced plastics
Authors: Makhdum, Farrukh
Keywords: Ultrasonic
Drilling
Hybrid drilling
Carbon fibre-reinforced plastics
Drilling forces
Surface roughness
Circularity
Delamination
Ultrasonically-assisted drilling.
Issue Date: 2014
Publisher: © Farrukh Makhdum
Abstract: 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. [Continues.]
Description: A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.
Sponsor: Wolfson School of Mechanical and Manufacturing Engineering
URI: https://dspace.lboro.ac.uk/2134/14721
Appears in Collections:PhD Theses (Mechanical, Electrical and Manufacturing Engineering)

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Form-2014-Makhdum.pdf769.16 kBAdobe PDFView/Open
Thesis-2014-Makhdum.pdf5.68 MBAdobe PDFView/Open

 

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