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Study of thermophysics during diamond drilling of fibreglass and carbon fibre-reinforced polymer composites

https://doi.org/10.21285/1814-3520-2021-3-290-299

Abstract

This paper examines thermophysics of the drilling process of polymeric composite materials, such as carbon-fibre-reinforced plastics (CFRP) and fibreglass by tubular diamond drill bits. Features of the COMSOL Multiphysics engineering software package were used. We employed Fourier heat equations, which express the intensity of heat gain by a mobile source in a moving coordinate system. The research was performed using the proprietary method of modelling spatial thermal action upon drilling polymer composite materials (fibreglass and carbon-fibre-reinforced plastics) in the COMSOL Multiphysics software environment. A tubular diamond drill bit with a diameter of 10 mm with two slots was chosen as a model cutting tool. Solid plates with a thickness of 5.5 mm made of layered fibrous polymer composite materials (fibreglass, carbon-fibre-reinforced plastic) were used as a preform. As a result of computer calculations, we obtained temperature fields of fibreglass and carbon-fibre-reinforced plastic during diamond drilling with a tubular tool. When studying the thermal behaviour of fibreglass and carbon-fibre-reinforced plastics, maximum temperature fields were located. The study revealed that the temperature reaches 413.6 and 448.7 K during CFRP and fibreglass drilling, respectively. It was shown that the distance of heat transfer from the edge of the hole into the preform was 6.42 and 6.40 mm for CFRP and fibreglass, respectively. A method of modelling the thermal effects when cutting polymer composite materials developed in the COMSOL Multiphysics environment allows complex analytical calculations of temperatures induced by drilling to be simplified. In addition, its use prevents overheating of a preform during drilling, allows assessing the depth of heat distribution inside the preform from the edge of the formed hole in different polymer composite materials. These measures increase the machining quality of polymer composite materials.

About the Authors

A. S. Dudarev
Perm National Research Polytechnic University
Russian Federation

Aleksandr S. Dudarev, Cand. Sci. (Eng.), Associate Professor of the Department of Innovative Technologies of Mechanical Engineering

29 Komsomolsky pr., Perm 614990



E. Kh. Gumarov
Perm National Research Polytechnic University
Russian Federation

Eldar Kh. Gumarov, Student

29 Komsomolsky pr., Perm 614990



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For citations:


Dudarev A.S., Gumarov E.Kh. Study of thermophysics during diamond drilling of fibreglass and carbon fibre-reinforced polymer composites. Proceedings of Irkutsk State Technical University. 2021;25(3):290-299. https://doi.org/10.21285/1814-3520-2021-3-290-299

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ISSN 2782-4004 (Print)
ISSN 2782-6341 (Online)