Al-Mahdy, A, Opoz, TT, Kotadia, HR, Ahuir Torres, JI and Sharp, MC (2025) Resin absorption and transmittance in CFRPs during CO2 laser surface preparation: Insights into matrix removal mechanisms. Optics and Laser Technology, 186. ISSN 0030-3992

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Abstract

Recent studies have explored CO2 laser surface treatment to enhance the adhesion of Carbon Fibre Reinforced Polymer (CFRP) composites. This paper investigates the absorptivity of epoxy resin at 10.6 μm to better understand and optimise laser-based surface preparation for improved bonding performance. Epoxy resin samples (15–110 µm thick) were exposed to unfocused CO2 laser beam (wavelength 10.6 μm). Results indicate that a 15 µm resin layer transmits 55 % of the laser power, while transmission drops significantly to 5 % for an 86 µm thick resin layer. Calculations based on the Beer-Lambert law reveal an absorption coefficient of 0.0343 μm-1 and a penetration depth of approximately 29 μm, indicating that the thickness of the matrix outer layer can significantly influence the removal mechanism.

Item Type:	Article
Uncontrolled Keywords:	0205 Optical Physics; Optoelectronics & Photonics; 40 Engineering; 46 Information and computing sciences
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Engineering
Publisher:	Elsevier
SWORD Depositor:	A Symplectic
Date Deposited:	11 Mar 2025 09:35
Last Modified:	11 Mar 2025 09:45
URI:	https://researchonline.ljmu.ac.uk/id/eprint/25844

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