Towards selective laser paint stripping using shock waves produced by laser-plasma interaction for aeronautical applications on AA 2024 based substrates

Laser stripping is a process which typically includes different forms of ablation phenomena. The presented work investigates a mechanical stripping process using high pressure laser-induced shock waves in a water confined regime. Power density is studied as a parameter for selective laser stripping...

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Bibliographic Details
Published in:Optics and laser technology 2021-09, Vol.141, p.107095, Article 107095
Main Authors: Ünaldi, Selen, Papadopoulos, Kosmas, Rondepierre, Alexandre, Rouchausse, Yann, Karanika, Alexandra, Deliane, Florent, Tserpes, Konstantinos, Floros, Giannis, Richaud, Emmanuel, Berthe, Laurent
Format: Article
Language:English
Subjects:
Ablation
Adhesion tests
Aircraft coatings
Aluminum
Chemical analysis
Engineering Sciences
Epoxy
Failure analysis
Flash lamps
Laser paint stripping
Laser plasma interactions
Laser shock processes
Lasers
Neodymium lasers
Numerical models
Optical microscopy
Paint removal
Plasma interactions
Polyurethane
Profilometers
Rapid prototyping
Semiconductor lasers
Shock waves
Stress analysis
Substrates
Water confinement
YAG lasers
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Summary:Laser stripping is a process which typically includes different forms of ablation phenomena. The presented work investigates a mechanical stripping process using high pressure laser-induced shock waves in a water confined regime. Power density is studied as a parameter for selective laser stripping on painted specimens and for adhesion relations with single layer epoxy targets. A flashlamp-pumped Nd:YAG laser with fixed spot size (4 mm) is shot on single layer epoxy and several layers of polymeric paint applied on a AA 2024-T3 (Aluminium) substrate. After laser treatment, samples are investigated with optical microscopy, profilometer and chemical analysis (FTIR & TGA). The results show that selective laser stripping is possible between different layers of external aircraft coatings and without any visual damage on the substrate material. In parallel to the experimental work, a numerical model has been developed to explain the background of the physical mechanisms and to qualitatively evaluate the detailed stress analysis and interfacial failure simulation for a single layer of epoxy on an aluminium substrate. The predicted failure patterns agree with the surfaces of the tested specimens observed by a microscope.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2021.107095