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A study of laser surface treatment in bonded repair of composite aircraft structures

Surface pre-treatment is one of the key processes in bonded repair of aircraft carbon fibre reinforced polymer composites. This paper investigates the surface modification of physical and chemical properties by laser ablation and conventional polish treatment techniques. Surface morphology analysed...

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Detalles Bibliográficos
Autores principales: Li, Shaolong, Sun, Ting, Liu, Chang, Yang, Wenfeng, Tang, Qingru
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society Publishing 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5882672/
https://www.ncbi.nlm.nih.gov/pubmed/29657748
http://dx.doi.org/10.1098/rsos.171272
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author Li, Shaolong
Sun, Ting
Liu, Chang
Yang, Wenfeng
Tang, Qingru
author_facet Li, Shaolong
Sun, Ting
Liu, Chang
Yang, Wenfeng
Tang, Qingru
author_sort Li, Shaolong
collection PubMed
description Surface pre-treatment is one of the key processes in bonded repair of aircraft carbon fibre reinforced polymer composites. This paper investigates the surface modification of physical and chemical properties by laser ablation and conventional polish treatment techniques. Surface morphology analysed by laser scanning confocal microscopy and scanning electron microscopy showed that a laser-treated surface displayed higher roughness than that of a polish-treated specimen. The laser-treated laminate exhibited more functional groups in the form of O 1 s/C 1 s atomic ratio of 30.89% for laser-treated and 20.14% for polish-treated as evidenced by X-ray photoelectron spectroscopy observation. Contact angle goniometry demonstrated that laser treatment can provide increased surface free energy and wettability. In the light of mechanical interlocking, molecular bonding and thermodynamics theories on adhesion, laser etching process displayed enhanced bonding performance relative to the polishing surface treatment. These properties resulted in an increased single lap shear strength and a cohesive failure mode for laser etching while an adhesive failure mode occurred in polish-treated specimen.
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spelling pubmed-58826722018-04-13 A study of laser surface treatment in bonded repair of composite aircraft structures Li, Shaolong Sun, Ting Liu, Chang Yang, Wenfeng Tang, Qingru R Soc Open Sci Engineering Surface pre-treatment is one of the key processes in bonded repair of aircraft carbon fibre reinforced polymer composites. This paper investigates the surface modification of physical and chemical properties by laser ablation and conventional polish treatment techniques. Surface morphology analysed by laser scanning confocal microscopy and scanning electron microscopy showed that a laser-treated surface displayed higher roughness than that of a polish-treated specimen. The laser-treated laminate exhibited more functional groups in the form of O 1 s/C 1 s atomic ratio of 30.89% for laser-treated and 20.14% for polish-treated as evidenced by X-ray photoelectron spectroscopy observation. Contact angle goniometry demonstrated that laser treatment can provide increased surface free energy and wettability. In the light of mechanical interlocking, molecular bonding and thermodynamics theories on adhesion, laser etching process displayed enhanced bonding performance relative to the polishing surface treatment. These properties resulted in an increased single lap shear strength and a cohesive failure mode for laser etching while an adhesive failure mode occurred in polish-treated specimen. The Royal Society Publishing 2018-03-21 /pmc/articles/PMC5882672/ /pubmed/29657748 http://dx.doi.org/10.1098/rsos.171272 Text en © 2018 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Engineering
Li, Shaolong
Sun, Ting
Liu, Chang
Yang, Wenfeng
Tang, Qingru
A study of laser surface treatment in bonded repair of composite aircraft structures
title A study of laser surface treatment in bonded repair of composite aircraft structures
title_full A study of laser surface treatment in bonded repair of composite aircraft structures
title_fullStr A study of laser surface treatment in bonded repair of composite aircraft structures
title_full_unstemmed A study of laser surface treatment in bonded repair of composite aircraft structures
title_short A study of laser surface treatment in bonded repair of composite aircraft structures
title_sort study of laser surface treatment in bonded repair of composite aircraft structures
topic Engineering
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5882672/
https://www.ncbi.nlm.nih.gov/pubmed/29657748
http://dx.doi.org/10.1098/rsos.171272
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