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Relationship between laser-generated micro- and nanostructures and the long-term stability of bonded epoxy-aluminum joints

Freund, Jonathan and Löbbecke, Miriam and Delp, Alexander and Walther, Frank and Wu, Shuang and Tröster, Thomas and Haubrich, Jan (2023) Relationship between laser-generated micro- and nanostructures and the long-term stability of bonded epoxy-aluminum joints. Journal of Adhesion. Taylor & Francis. doi: 10.1080/00218464.2023.2223475. ISSN 0021-8464.

[img] PDF - Only accessible within DLR bis 17 June 2024 - Postprint version (accepted manuscript)

Official URL: https://www.tandfonline.com/doi/abs/10.1080/00218464.2023.2223475?journalCode=gadh20


To improve the mechanical performance and to address current shortcomings of adhesive bonds such as bond degradation due to aging, a pulsed laser surface pretreatment of the metal surfaces of aluminum AW 6082-T6 joints with epoxy adhesive E320 is investigated. The surface treatment of the specimens resulted in increased single-lap shear (SLS) strengths before and after hydrothermal aging in 80°C hot water compared to nonpretreated reference specimens. In order to reveal the correlations of laser parameters, resulting surface morphologies and the SLS strength, differently laser pretreated surfaces were characterized at the micro- and nanoscale using optical and scanning electron microscopies. The surface enlargement was quantified with a digital image analysis of cross-sections prepared from the joint interfaces. An analysis of variances (ANOVA) of the SLS results indicated that the laser parameters power and pulse frequency were most critical for obtaining high SLS strengths. Pretreated joint surfaces with a high micro- and nano-surface enlargement and deep solidification structures provide high SLS strengths of up to 50 MPa and almost negligible aging losses of merely 4%. Undercut structures on the pretreated surfaces were found to be beneficial for the mechanical and aging properties when only limited micro- and nanostructuring was applied.

Item URL in elib:https://elib.dlr.de/195589/
Document Type:Article
Title:Relationship between laser-generated micro- and nanostructures and the long-term stability of bonded epoxy-aluminum joints
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Freund, JonathanUNSPECIFIEDhttps://orcid.org/0000-0003-1379-798X137947129
Löbbecke, MiriamUNSPECIFIEDhttps://orcid.org/0000-0001-7838-6204UNSPECIFIED
Delp, AlexanderUNSPECIFIEDhttps://orcid.org/0000-0002-2057-7806UNSPECIFIED
Walther, FrankTU Dortmundhttps://orcid.org/0000-0003-2287-2099UNSPECIFIED
Wu, ShuangUNSPECIFIEDhttps://orcid.org/0000-0001-8645-9952UNSPECIFIED
Tröster, ThomasUniversität Paderbornhttps://orcid.org/0000-0003-3488-5575UNSPECIFIED
Haubrich, JanUNSPECIFIEDhttps://orcid.org/0000-0002-5748-2755UNSPECIFIED
Date:6 June 2023
Journal or Publication Title:Journal of Adhesion
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:Taylor & Francis
Keywords:Laser surface pretreatment; surface structuring; surface enlargement; image analysis; adhesive bonding
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Advanced Materials and New Manufacturing Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Freund, Jonathan
Deposited On:03 Jul 2023 08:48
Last Modified:03 Jul 2023 08:48

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