Effect of nanofiller on fibre laser drilling quality of carbon fibre reinforced polymer composite laminates

Kumar, Dhiraj and Singh, Kalyan Kumar (2019) Effect of nanofiller on fibre laser drilling quality of carbon fibre reinforced polymer composite laminates. In: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING, 233 (4). pp. 857-870.

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Abstract

Laser machining of carbon fibre reinforced polymer composites is a challenging task due to a significant difference between physical and thermal properties of the constituent materials, i.e. polymer matrix and carbon fibres. This results in extended heat-affected zone (HAZ), taper kerf and poor surface finishing. This paper focuses on an investigation, attempting to minimise the divergence in the decomposition temperature of carbon fibres and epoxy resin by adding multi-walled carbon nanotubes in polymer matrix as a secondary reinforcement. High thermal conductivity of multi-walled carbon nanotubes increases the thermal diffusivity of polymer matrix, which in turn reduces the matrix recession. In addition, laser power and scan speed was also considered as an input parameter and their influence on output responses such as HAZ, taper angle and surface roughness has been studied. To analyse the effect of multi-walled carbon nanotubes on the resultant thermal damage, an innovative technique, i.e. scanning acoustic microscopy was used. This technique provides a ply-by-ply damage analysis. C-scans of the top and bottom surface of the machined holes in the composite were also carried out. Further, micrographs of the holes were taken to analyse the quality of the holes using field-emission scanning electron microscope. The obtained results indicated that HAZ, taper angle and surface roughness of holes decreased by similar to 30%, similar to 47% and similar to 43%, respectively, with 1.5 wt% multi-walled carbon nanotubes doped carbon fibre reinforced polymer laminates, when compared with the results obtained from experiments with neat carbon fibre reinforced polymer composite laminates.

Item Type:	Journal Article
Publication:	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
Publisher:	SAGE PUBLICATIONS LTD
Additional Information:	Copyright for this article belongs to SAGE PUBLICATIONS LTD
Keywords:	Fibre laser; drilling; carbon fibre reinforced polymer; multi-walled carbon nanotubes; HAZ; taper angle; surface roughness
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	14 Feb 2020 11:43
Last Modified:	14 Feb 2020 11:43
URI:	http://eprints.iisc.ac.in/id/eprint/63402

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