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Article

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

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Institute of Mechanics and Adaptronics, Technische Universität Braunschweig, 38106 Braunschweig, Germany
2
German Aerospace Center (DLR), Institute of Composite Structures and Adaptive Systems, 38108 Braunschweig, Germany
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Institute of Microtechnology, Technische Universität Braunschweig, 38124 Braunschweig, Germany
*
Author to whom correspondence should be addressed.
Current address: J.M. Voith SE & Co. KG | VTA, 38293 Salzgitter, Germany.
Academic Editor: Susmita Naskar
J. Compos. Sci. 2021, 5(2), 51; https://doi.org/10.3390/jcs5020051
Received: 11 January 2021 / Revised: 28 January 2021 / Accepted: 31 January 2021 / Published: 7 February 2021
(This article belongs to the Special Issue Advanced Multi-functional Composites and Metamaterials)
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. View Full-Text
Keywords: composite structures; structural bonding; multifunctional bondline; function conformity; sensor integration; foil sensors composite structures; structural bonding; multifunctional bondline; function conformity; sensor integration; foil sensors
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MDPI and ACS Style

Steinmetz, J.; Löbel, T.; Völkerink, O.; Hühne, C.; Sinapius, M.; von der Heide, C.; Dietzel, A. The Working Principles of a Multifunctional Bondline with Disbond Stopping and Health Monitoring Features for Composite Structures. J. Compos. Sci. 2021, 5, 51. https://doi.org/10.3390/jcs5020051

AMA Style

Steinmetz J, Löbel T, Völkerink O, Hühne C, Sinapius M, von der Heide C, Dietzel A. The Working Principles of a Multifunctional Bondline with Disbond Stopping and Health Monitoring Features for Composite Structures. Journal of Composites Science. 2021; 5(2):51. https://doi.org/10.3390/jcs5020051

Chicago/Turabian Style

Steinmetz, Julian, Thomas Löbel, Oliver Völkerink, Christian Hühne, Michael Sinapius, Chresten von der Heide, and Andreas Dietzel. 2021. "The Working Principles of a Multifunctional Bondline with Disbond Stopping and Health Monitoring Features for Composite Structures" Journal of Composites Science 5, no. 2: 51. https://doi.org/10.3390/jcs5020051

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