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        Machinability of natural-fibre-reinforced polymer composites: Convectional vs ultrasonically-assisted machining

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        Author
        Wang, D.
        Onawumi, P. Y.
        Ismail, Sikiru O.
        Dhakal, Hom N.
        Popov, I.
        Silberschmidt, V. V.
        Roy, A.
        Attention
        2299/21083
        Abstract
        Natural-fibre-reinforced polymer (NFRP) composites are becoming a viable alternative to synthetic fibre based composites in many industrial applications. Machining is often necessary to facilitate assembly of parts in a final product. This study focuses on a comparative experimental analysis of the effects of conventional drilling (CD) and a hybrid ultrasonically-assisted drilling (UAD) of a hemp fibre-reinforced vinyl ester composite laminate. The results obtained indicate that UAD is more efficient when compared to CD for a range of drilling conditions. It yields lower cutting forces and energy resulting in reduced machining-induced damage in the composite, including diminished burr formation and fibre pull-outs. The holes drilled with UAD exhibit improved surface finish and hole quality when compared to those produced with CD. The study demonstrates the applicability of UAD as a viable machining process for improved machinability of heterogeneous NFRP composite materials.
        Publication date
        2019-01-31
        Published in
        Composites Part A: Applied Science and Manufacturing
        Published version
        https://doi.org/10.1016/j.compositesa.2019.01.028
        Other links
        http://hdl.handle.net/2299/21083
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