On enhancement of fracture resistance of adhesive joints by surface micropatterning using a femtosecond laser

Fengzhen Sun; Pavel Penchev; Catalin I. Pruncu; Junjie Wang; Chris Pargeter; Yaping Wang; Chang Li; Stefan Dimov; Jun Jiang; Bamber R.K. Blackman

doi:10.1016/j.jmatprotec.2023.117904

On enhancement of fracture resistance of adhesive joints by surface micropatterning using a femtosecond laser

Fengzhen Sun^*, Pavel Penchev, Catalin I. Pruncu^*, Junjie Wang, Chris Pargeter, Yaping Wang, Chang Li, Stefan Dimov, Jun Jiang, Bamber R.K. Blackman

^*Corresponding author for this work

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

This study focuses on the influence of surface micropatterns, including uniform and nonuniform grooves fabricated by selective removal of a designed volume from aluminum alloy substrates using a femtosecond laser, on the mode I fracture behavior of adhesively bonded interfaces. The morphology, wettability, chemistry and microstructure of the patterned surfaces have been analyzed. The mode I fracture behavior of adhesive joints was characterized by measuring the fracture resistance using a J-integral approach, and the fracture process in the joint was investigated numerically using a continuum damage model. The results show that the laser patterning has modified the surface roughness, wettability and surface chemistry such that the fracture resistance could be greatly increased. It also reveals the significance of patterning uniformity across the surfaces and the existence of a limiting effective patterning ratio (the ratio of the patterned area to the flat bonding area) on enhancing the fracture resistance. Local plastic deformation that occurred in the adhesive at the patterned structures due to stress concentration was found to be one toughening mechanism although it tended to induce crack growth close to one substrate-adhesive interface.

Original language	English
Article number	117904
Journal	Journal of Materials Processing Technology
Volume	315
Early online date	9 Feb 2023
DOIs	https://doi.org/10.1016/j.jmatprotec.2023.117904
Publication status	Published - Jun 2023

Bibliographical note

Funding Information:
This study was funded by Innovate UK's APC7 “RACEForm” grant (NO. 113153) led by Impression Technologies Ltd in collaboration with Gestamp, Innoval Technology Ltd, Imperial College London and Brunel University London. The authors would like to acknowledge Sika AG (Switzerland) for supplying the adhesive.

Publisher Copyright:
© 2023

Keywords

Adhesive joints
Femtosecond laser patterning
Fracture resistance
Surface patterns

ASJC Scopus subject areas

Ceramics and Composites
Computer Science Applications
Metals and Alloys
Industrial and Manufacturing Engineering

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On enhancement of fracture resistance of adhesive joints by surface micropatterning using a femtosecond laser
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Cite this

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title = "On enhancement of fracture resistance of adhesive joints by surface micropatterning using a femtosecond laser",

abstract = "This study focuses on the influence of surface micropatterns, including uniform and nonuniform grooves fabricated by selective removal of a designed volume from aluminum alloy substrates using a femtosecond laser, on the mode I fracture behavior of adhesively bonded interfaces. The morphology, wettability, chemistry and microstructure of the patterned surfaces have been analyzed. The mode I fracture behavior of adhesive joints was characterized by measuring the fracture resistance using a J-integral approach, and the fracture process in the joint was investigated numerically using a continuum damage model. The results show that the laser patterning has modified the surface roughness, wettability and surface chemistry such that the fracture resistance could be greatly increased. It also reveals the significance of patterning uniformity across the surfaces and the existence of a limiting effective patterning ratio (the ratio of the patterned area to the flat bonding area) on enhancing the fracture resistance. Local plastic deformation that occurred in the adhesive at the patterned structures due to stress concentration was found to be one toughening mechanism although it tended to induce crack growth close to one substrate-adhesive interface.",

keywords = "Adhesive joints, Femtosecond laser patterning, Fracture resistance, Surface patterns",

author = "Fengzhen Sun and Pavel Penchev and Pruncu, {Catalin I.} and Junjie Wang and Chris Pargeter and Yaping Wang and Chang Li and Stefan Dimov and Jun Jiang and Blackman, {Bamber R.K.}",

note = "Funding Information: This study was funded by Innovate UK's APC7 “RACEForm” grant (NO. 113153) led by Impression Technologies Ltd in collaboration with Gestamp, Innoval Technology Ltd, Imperial College London and Brunel University London. The authors would like to acknowledge Sika AG (Switzerland) for supplying the adhesive. Publisher Copyright: {\textcopyright} 2023",

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language = "English",

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AU - Sun, Fengzhen

AU - Penchev, Pavel

AU - Pruncu, Catalin I.

AU - Wang, Junjie

AU - Pargeter, Chris

AU - Wang, Yaping

AU - Li, Chang

AU - Dimov, Stefan

AU - Jiang, Jun

AU - Blackman, Bamber R.K.

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PY - 2023/6

Y1 - 2023/6

N2 - This study focuses on the influence of surface micropatterns, including uniform and nonuniform grooves fabricated by selective removal of a designed volume from aluminum alloy substrates using a femtosecond laser, on the mode I fracture behavior of adhesively bonded interfaces. The morphology, wettability, chemistry and microstructure of the patterned surfaces have been analyzed. The mode I fracture behavior of adhesive joints was characterized by measuring the fracture resistance using a J-integral approach, and the fracture process in the joint was investigated numerically using a continuum damage model. The results show that the laser patterning has modified the surface roughness, wettability and surface chemistry such that the fracture resistance could be greatly increased. It also reveals the significance of patterning uniformity across the surfaces and the existence of a limiting effective patterning ratio (the ratio of the patterned area to the flat bonding area) on enhancing the fracture resistance. Local plastic deformation that occurred in the adhesive at the patterned structures due to stress concentration was found to be one toughening mechanism although it tended to induce crack growth close to one substrate-adhesive interface.

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On enhancement of fracture resistance of adhesive joints by surface micropatterning using a femtosecond laser

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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