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The Working Principles of a Multifunctional Bondline with Disbond Stopping and Health Monitoring Features for Composite Structures

Steinmetz, Julian and Löbel, Thomas and Völkerink, Oliver and Hühne, Christian and Sinapius, Michael and von der Heide, Chresten and Dietzel, Andreas (2021) The Working Principles of a Multifunctional Bondline with Disbond Stopping and Health Monitoring Features for Composite Structures. Journal of Composites Science, 5 (2), p. 51. Multidisciplinary Digital Publishing Institute (MDPI). ISSN 2504-477X.

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Abstract

In comparison to bolted joints, structural bonds are the desirable joining method for light-weight composite structures. To achieve a broad implementation of this technology in safety critical structures, the issues of structural bonds due to their complex and often unpredictable failure mechanisms have to be overcome. The proposed multifunctional bondline approach aims at solving this by adding two safety mechanisms to structural bondlines. These are a design feature for limiting damages to a certain size and a structural health monitoring system for damage detection. The key question is whether or not the implementation of both safety features without deteriorating the strength in comparison to a healthy conventional bondline is possible. In previous studies on the hybrid bondline, a design feature for damage limitations in bondlines by means of disbond stopping features was already developed. Thus, the approach to evolve the hybrid bondline to a multifunctional one is followed. A thorough analysis of the shear stress and tensile strain distribution within the hybrid bondline demonstrates the feasibility to access the status of the bondline by monitoring either of these quantities. Moreover, the results indicate that it is sufficient to place sensors within the disbond stopping feature only and not throughout the entire bondline. Based on these findings, the three main working principles of the multifunctional are stated. Finally, two initial concepts for a novel multifunctional disbond arrest feature are derived for testing the fundamental hypothesis that the integration of micro sensors into the disbond stopping feature only enables the crack arrest and the health monitoring functions, while reaching the mechanical strength of a conventional healthy epoxy bondline. This work therefore provides the fundamentals for future investigations in the scope of the multifunctional bondline.

Item URL in elib:https://elib.dlr.de/140946/
Document Type:Article
Title:The Working Principles of a Multifunctional Bondline with Disbond Stopping and Health Monitoring Features for Composite Structures
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Steinmetz, Julianj.steinmetz (at) tu-braunschweig.dehttps://orcid.org/0000-0003-1969-9387
Löbel, ThomasThomas.Loebel (at) voith.comUNSPECIFIED
Völkerink, Oliveroliver.voelkerink (at) dlr.dehttps://orcid.org/0000-0002-9589-1963
Hühne, Christianchristian.huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Sinapius, MichaelMichael.Sinapius (at) dlr.dehttps://orcid.org/0000-0002-1873-9140
von der Heide, ChrestenUNSPECIFIEDUNSPECIFIED
Dietzel, Andreasa.dietzel (at) tu-braunschweig.deUNSPECIFIED
Date:January 2021
Journal or Publication Title:Journal of Composites Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:No
In ISI Web of Science:Yes
Volume:5
Page Range:p. 51
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2504-477X
Status:Published
Keywords:composite structures;foil sensors;function conformity;multifunctional bondline;sensor integration;structural bonding
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Structural Materials and Design
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Hühne, Prof. Dr. Christian
Deposited On:02 Mar 2021 06:57
Last Modified:11 Jun 2021 04:13

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