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ABSTRACT
As it is known that the hybrid Fibre Reinforced Polymer (FRP) composite laminate is a recently evolved class of structural material. Hence, the present work deals with secondary processing ability like hole drilling on hard to machine FRP laminate. The influence of drilling attributes on the delamination factor and surface roughness contours are studied for a high thickness hybrid (carbon/glass FRP) laminates. Here, the experimentation was performed utilising Taguchi’s L27 design of experiments array. Later, on post-drilling, the predominant and optimum variables were studied through taguchi and variance analysis to highlight their contribution on the response functions. Taguchi results indicate that the combination of the 90՞tungsten carbide tool, speed of 800 rpm, and rate of feed 50 mm/min gives the best performance concerning the delamination. Also, it was observed that the combination of the 118՞tungsten carbide tool, cutting speed of 900 rpm and the rate of feed 60 mm/min give the best performance concerning surface roughness. Whereas, as per ANOVA, the highest percentage contribution factor was concerned to a tool material followed by other factors and analysed data lie with the confidence level of 95%. The work also indicates that tungsten carbide tool yield better results compared to high-speed steel tool. Further, fibre morphology has been studied, which indicates optimal structure with minimal damage.
Acknowledgments
Since this is a non-funded work, there has been no significant financial support for this work that could have influenced its outcome.
Disclosure statement
No, potential conflict of interest was reported by the authors.
Additional information
Notes on contributors
N.S. Manjunatha Babu
N. S. Manjunatha Babu, Associate professor, Dept. of Mechanical Engineering, Dr. T Thimmaiah Institute of Technology, VTU, Kolar Gold Fields. Bachelor of Mechanical Engineering and a Masters Degree, Doctor of Philosophy from Visvesvaraya Technological University. He has over 14 years of teaching experience. His research areas of interest are machining effect of composite laminates, stress analysis on engineering materials.
Rajesh Mathivanan N
Rajesh Mathivanan N, Professor, Advanced Composites Research Center (ACRC), Dept. of Mechanical Engineering, PES University, Bangalore, Bachelor of Mechanical Engineering from Bangalore University and Masters Degree from Visvesvaraya Technological University. He received his Ph.D. degree from the National Institute of Technology (NIT), Tiruchirappalli in the area of impact characteristics of composite laminates. His research interests include product development, impact characterisation, and machining effects on composite laminates.
Harish Kumar M
Harish Kumar M, Assistant professor, Dept. of Automobile Engineering, Christ University, Bangalore. Bachelor of Mechanical Engineering and a Masters Degree from Visvesvaraya Technological University. He has over 10 years of teaching experience. His research areas of interest are impact and machining effect of composite laminates, stress analysis on engineering materials.