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The Adhesive Zone Mix Disbond Arrest Feature Results (EU-FP7 Project BOPACS)

Holzhüter, Dirk and Löbel, Thomas and Hühne, Christian (2018) The Adhesive Zone Mix Disbond Arrest Feature Results (EU-FP7 Project BOPACS). AVT-266 Research Specialists’ Meeting on Use of Bonded Joints in Military Applications, 15.-16.4.2018, Turin, Italien.

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Abstract

Nowadays bonded joints are state of the art in the assembly of composite aircraft structures. Due to current civil aerospace regulations, the implementation of secondary bonded joints is limited. However, current regulations and means of compliance provided by the authorities offer four possibilities to attain certification of safety critical structures: a fail-safe joint design, full proof testing, non-destructive testing of the joint strength, and a secured maximum disbond by design features assuring a limit load capacity of the remaining joint. The last approach has been investigated thoroughly in the European 7th Framework research project BoPACs (Boltless Assembly of Primary Aircraft Structures). The presented paper summarizes the activities and results of the German Aerospace Center within the BoPACs project. In particular, this paper focuses on the so called Adhesive Zone Mix Disbond Arrest Feature developed by DLR. The feature efficiently combines an adhesively bonded and a thermoplastic welded joint. The thermoplastic weld stops growing cracks due to its high toughness while the conventional adhesively bonded joint carries the major operational loads. The paper outlines the smart manufacturing process enabling an easy to use and cost efficient Disbond Stopping Feature. The mechanical effectiveness is validated on coupon level with fatigue testing of cracked lap shear (CLS) samples. Experimental and analysis results are summarized. Conclusions from tests and a further improvement of the feature, the so called Surface Toughening Feature, are presented. The authors kindly acknowledge the European Commission for funding the research and the contributing partners for the excellent cooperation within the project.

Item URL in elib:https://elib.dlr.de/119840/
Document Type:Conference or Workshop Item (Speech)
Title:The Adhesive Zone Mix Disbond Arrest Feature Results (EU-FP7 Project BOPACS)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Holzhüter, DirkDirk.Holzhueter (at) dlr.dehttps://orcid.org/0000-0003-1001-2366
Löbel, ThomasThomas.Loebel (at) dlr.deUNSPECIFIED
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:16 April 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Hybrid Bondline, Crack Stopping, Disbond Arrest Feature, Bonding Certification, BOPACS, Adhesive Zone Mix, Composite Bonding
Event Title:AVT-266 Research Specialists’ Meeting on Use of Bonded Joints in Military Applications
Event Location:Turin, Italien
Event Type:international Conference
Event Dates:15.-16.4.2018
Organizer:NATO STO
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: Holzhüter, Dirk
Deposited On:28 May 2018 11:26
Last Modified:31 Jul 2019 20:17

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