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A New Joining-Device for Manufacturing Tubular Butt Joints with Higher Curing Temperatures of Film Adhesives

Schollerer, Martin and Kosmann, Jens and Löbel, Thomas and Holzhüter, Dirk and Hühne, Christian (2017) A New Joining-Device for Manufacturing Tubular Butt Joints with Higher Curing Temperatures of Film Adhesives. Applied Adhesion Science, 5 (15). Springer. doi: 10.1186/s40563-017-0094-8. ISSN 2196-4351.

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Official URL: https://appliedadhesionscience.springeropen.com/articles/10.1186/s40563-017-0094-8


For detailed stress distribution analysis of bondlines, non-linear finite element analy- sis (FEA) is necessary. Depending on the load case in relation to shear and tension/ compression adhesives show a different behaviour of the yield point [ 1 ], which is e.g. included in the Mahnken and Schlimmer [ 2 ] model. State of the art for biaxial tested adhesive material-characteristics is the use of bonded tubular butt joints under variable torsion and tension loads. Important for the quality of the determined material values is the alignment of both tubes. The quality is significantly improved, if both tubes are aligned perfectly coaxial. Also, the bondline has to be free of voids. In previous work [ 3 ], Wölper investigated the effects of coaxial and angle deviations for the results of material characteristics using FEA. A slight deviation has a strong negative impact to the results. Particularly for thin film-adhesives with elevated curing temperatures, the change of viscosity of the adhesive and the thermal expansion of the tubes must be considered. Previous investigations regarding the manufacturing of the specimens showed shortfalls in joining and curing them. Due to voids, geometric deviations or poorly-bonded tubes, no reliable results were achieved yet. Therefore, a new assembly- device is developed and tested. The results show well joined tubes without a signifi- cant angle deviation and with an average of 40 μm in coaxial deviation. The thickness of the bondline can be adjusted and is constant over the whole diameter. The new joining-device enables the testing of tubular butt joints to determine biaxial material values of thin higher-temperature-cured film-adhesives. The device is patented to DE 102017114538.9.

Item URL in elib:https://elib.dlr.de/114335/
Document Type:Article
Title:A New Joining-Device for Manufacturing Tubular Butt Joints with Higher Curing Temperatures of Film Adhesives
AuthorsInstitution or Email of AuthorsAuthor's 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
Löbel, Thomasthomas.loebel (at) dlr.deUNSPECIFIED
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:September 2017
Journal or Publication Title:Applied Adhesion Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:No
DOI :10.1186/s40563-017-0094-8
Series Name:Applied Adhesion Science 2017
Keywords:Adhesive bonding, Tubular butt joint, Joining device, Elevated curing temperature, Biaxial testing
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Schollerer, Martin
Deposited On:11 Dec 2017 07:02
Last Modified:08 Mar 2018 18:40

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