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Surface Toughening - A Concept to Decrease Stress Peaks in Bonded Joints

Schollerer, Martin and Kosmann, Jens and Völkerink, Oliver and Holzhüter, Dirk and Hühne, Christian (2018) Surface Toughening - A Concept to Decrease Stress Peaks in Bonded Joints. Journal of Adhesion, 94 (14), pp. 1-20. Taylor & Francis. DOI: 10.1080/00218464.2018.1555041 ISBN 0021-8464 ISSN 0021-8464

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Official URL: https://www.tandfonline.com/doi/full/10.1080/00218464.2018.1555041


By using fiber-reinforced plastics as the material for lightweight structures, adhesive bonding becomes an increasingly focused solution for joining these components. In comparison to bolted, joints, adhesive bonding has a lot of known benefits, e.g. sealing, no weakening of adherends and a homogeneous load transfer. However, the stress distributions in single-lap joints are not homogeneous all over. Both the shear and peel stress distribution have a peak at the overlap ends of the joint and a lower loaded part in the middle, as shown by Volkersen and Goland and Reissner. In order to reduce these stress concentrations, there are known concepts for the modification of the joint. In this paper, adherend chamfering, different adhesive spew fillet geometries, and the mixed adhesive joint are investigated and compared to a novel local adherend surface toughening concept by using a thermoplastic PVDF layer. A high-resolution digital image correlation is used to visualize the deformation in the bondline. While the state-of-the-art used concepts do not show a high increase of joint strength for single lap joints, the joint strength for the surface toughening specimens can be increased by up to 84%.

Item URL in elib:https://elib.dlr.de/124758/
Document Type:Article
Title:Surface Toughening - A Concept to Decrease Stress Peaks in Bonded Joints
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schollerer, MartinMartin.Schollerer (at) dlr.dehttps://orcid.org/0000-0001-7015-9461
Kosmann, Jensjens.kosmann (at) dlr.dehttps://orcid.org/0000-0002-2225-4832
Völkerink, Oliveroliver.voelkerink (at) dlr.dehttps://orcid.org/0000-0002-9589-1963
Holzhüter, Dirkdirk.holzhueter (at) dlr.dehttps://orcid.org/0000-0003-1001-2366
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:December 2018
Journal or Publication Title:Journal of Adhesion
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1080/00218464.2018.1555041
Page Range:pp. 1-20
da Silva, Lucas F.M.Department of Mechanical Engineering
Publisher:Taylor & Francis
Series Name:The Journal of Adhesion 2018
Keywords:Finite element analysis; joint design; lap-shear; stress distribution; surface modification
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Schollerer, Martin
Deposited On:13 Dec 2018 06:32
Last Modified:24 Jun 2019 11:18

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