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A hybrid bondline concept for bonded composite joints

Löbel, Thomas and Holzhüter, Dirk and Sinapius, Michael and Hühne, Christian (2016) A hybrid bondline concept for bonded composite joints. International Journal of Adhesion and Adhesives (68), pp. 229-238. Elsevier. DOI: http://dx.doi.org/10.1016/j.ijadhadh.2016.03.025 ISSN 0143-7496

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Abstract

Based on the experience in the past and the occurrence of in-service damages, the authorities restrict today the application of adhesive bonding of composite structures for aircraft applications. However, certification limitations can be overcome if occurring disbonds within a bond are stopped by implemented design features, so called disbond stopping features. Consequently, a novel bondline architecture for bonded composite joints is proposed. By implementing a distinct rather ductile thermoplastic phase, a physical barrier for growing disbonds is obtained and thus a fail-safe design, respectively. Moreover, the joint is established by using two different joining technologies, namely adhesive bonding and thermoset composite welding. A sophisticated manufacturing technique is developed for the hybrid bondline concept to achieve a high strength joint. The joint's quality is examined by means of several analytical methods like microsections, scanning electron microscopy (SEM), and energy-dispersive X-Ray (EDX) analysis. Additionally, the mechanical performance is evaluated by static Double Cantilever Beam (DCB) and Single Lap Shear (SLS) tests.

Item URL in elib:https://elib.dlr.de/106537/
Document Type:Article
Title:A hybrid bondline concept for bonded composite joints
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Löbel, ThomasThomas.Loebel (at) dlr.deUNSPECIFIED
Holzhüter, Dirkdirk.holzhueter (at) dlr.deUNSPECIFIED
Sinapius, Michaelmichael.sinapius (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:International Journal of Adhesion and Adhesives
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :http://dx.doi.org/10.1016/j.ijadhadh.2016.03.025
Page Range:pp. 229-238
Publisher:Elsevier
ISSN:0143-7496
Status:Published
Keywords:Joint design; Fracture toughness; Hybrid joints; Disbond stopping feature
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: Löbel, Thomas
Deposited On:16 Oct 2016 10:18
Last Modified:16 Oct 2016 10:18

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