Title: Multi-response optimisation in drilling of CFRP/Ti6Al4V stacks: a degree of similarity approach

Authors: M. Senthilkumar; A. Prabukarthi; V. Krishnaraj

Addresses: Department of Production Engineering, PSG College of Technology, Coimbatore-641004, Tamil Nadu, India ' Department of Mechanical Engineering, PSG College of Technology, Coimbatore-641004, Tamil Nadu, India ' Department of Production Engineering, PSG College of Technology, Coimbatore-641004, Tamil Nadu, India

Abstract: Carbon fibre reinforced plastic (CFRP) composite with aluminium or titanium alloy has been widely used by aerospace industries. It is still a challenge to make holes on composite/metal stack with high quality due to their dissimilarity in properties. It is vital to have a good insight of the machining conditions on the quality of drilled holes. This paper aims to investigate the influence of parameters (spindle speed, feed rate) and tool geometry on drilling of CFRP/Ti6Al4V stacks with respect to drilling force and hole quality (roundness, delamination and burr height). The experiments were carried out using three modified twist drill (K20). Multi-response optimisation of performance measures (drilling force and hole quality) carried out using Taguchi integrated TOPSIS and Deng's similarity-based approach revealed that spindle speed (895 rpm), feed rate (0.05 mm/rev) and drill tool with point angle of 130° gave satisfactory performance measures for drilling CFRP/Ti6Al4V stacks.

Keywords: drilling; carbon fibre reinforced plastic; CFRP; Ti6Al4V; TOPSIS; Deng's similarity-based method; Taguchi's optimisation philosophy.

DOI: 10.1504/IJMATEI.2017.090235

International Journal of Materials Engineering Innovation, 2017 Vol.8 No.3/4, pp.222 - 249

Received: 05 Jun 2017
Accepted: 21 Sep 2017
Published online: 06 Mar 2018 *

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