University of Hertfordshire

From the same journal

By the same authors


  • D. Wang
  • P. Y. Onawumi
  • Sikiru O. Ismail
  • Hom N. Dhakal
  • I. Popov
  • V. V. Silberschmidt
  • A. Roy
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Original languageEnglish
Pages (from-to)188–195
Number of pages8
JournalComposites Part A: Applied Science and Manufacturing
Early online date31 Jan 2019
Publication statusE-pub ahead of print - 31 Jan 2019


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.


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