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Smart Inlays for Simultaneous Crack Sensing and Arrest in Multifunctional Bondlines of Composites

von der Heide, Chresten and Steinmetz, Julian and Schollerer, Martin Johannes and Hühne, Christian and Sinapius, Johannes Michael and Dietzel, Andreas (2021) Smart Inlays for Simultaneous Crack Sensing and Arrest in Multifunctional Bondlines of Composites. Sensors, 21 (11), p. 3852. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/s21113852. ISSN 1424-8220.

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Official URL: https://www.mdpi.com/1424-8220/21/11/3852

Abstract

Disbond arrest features combined with a structural health monitoring system for permanent bondline surveillance have the potential to significantly increase the safety of adhesive bonds in composite structures. A core requirement is that the integration of such features is achieved without causing weakening of the bondline. We present the design of a smart inlay equipped with a micro strain sensor-system fabricated on a polyvinyliden fluorid (PVDF) foil material. This material has proven disbond arrest functionality, but has not before been used as a substrate in lithographic micro sensor fabrication. Only with special pretreatment can it meet the requirements of thin film sensor elements regarding surface roughness and adhesion. Moreover, the sensor integration into composite material using a standard manufacturing procedure reveals that the smart inlays endure this process even though subjected to high temperatures, curing reactions and plasma treatment. Most critical is the substrate melting during curing when sensory function is preserved with a covering caul plate that stabilizes the fragile measuring grids. The smart inlays are tested by static mechanical loading, showing that they can be stretched far beyond critical elongations of composites before failure. The health monitoring function is verified by testing the specimens with integrated sensors in a cantilever bending setup. The results prove the feasibility of micro sensors detecting strain gradients on a disbond arresting substrate to form a so-called multifunctional bondline.

Item URL in elib:https://elib.dlr.de/142955/
Document Type:Article
Title:Smart Inlays for Simultaneous Crack Sensing and Arrest in Multifunctional Bondlines of Composites
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
von der Heide, Chrestenc.von-der-heide (at) tu-braunschweig.dehttps://orcid.org/0000-0002-9983-0340
Steinmetz, Julianj.steinmetz (at) tu-braunschweig.dehttps://orcid.org/0000-0003-1969-9387
Schollerer, Martin Johannesmartin.schollerer (at) dlr.dehttps://orcid.org/0000-0001-7015-9461
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Sinapius, Johannes Michaelm.sinapius (at) tu-braunschweig.dehttps://orcid.org/0000-0002-1873-9140
Dietzel, Andreasa.dietzel (at) tu-braunschweig.dehttps://orcid.org/0000-0003-2090-6259
Date:2 June 2021
Journal or Publication Title:Sensors
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:21
DOI :10.3390/s21113852
Page Range:p. 3852
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Smart Sensors for Damage Detection
ISSN:1424-8220
Status:Published
Keywords:thin-film sensors; foil sensors; composite structures; structural bonding; multifunctional bondline; function conformity; sensor integration
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: Schollerer, Martin
Deposited On:05 Jul 2021 07:34
Last Modified:05 Jul 2021 07:34

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