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Smart cure cycles for fiber metal laminates using embedded fiber Bragg grating sensors

Prussak, Robert and Kappel, Erik and Stefaniak, Daniel and Hühne, Christian and Sinapius, Michael (2019) Smart cure cycles for fiber metal laminates using embedded fiber Bragg grating sensors. Composite Structures, 213, pp. 252-260. Elsevier. DOI: 10.1016/j.compstruct.2019.01.079 ISSN 0263-8223

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S0263822318339369

Abstract

In this paper, a smart cure cycle with an additional cooling step for co-cure bonded fiber metal laminates (FML) is developed to reduce process related thermal residual stresses. An online measuring technique with fiber Bragg grating (FBG) sensors is used to gain a clear understanding of the formation process of residual stresses during cure, as well as to determine the resulting residual stress level. Fiber optic sensors are integrated in carbon fiber reinforced plastic (CFRP) – steel laminates. The recorded processing strain curves enable the characterization of the mechanical interaction of the metal and CFRP-layers. By introducing an additional cooling-step, the moment of the connection between the individual components is being influenced. The conducted experiments show a significant reduction of the resulting stress-free temperature. A variety of temperature cycle modifications, like different cooling temperatures, as well as modified cooling and heating rates, are investigated. The impact of these parameters on the process-induced strains and stresses are detected by the fiber optic strain sensors. The thermal residual stresses are reduced by up to 23% for the specimens in focus, when the developed cure cycles with FBG sensors for a monitored cooling and reheating are used.

Item URL in elib:https://elib.dlr.de/126355/
Document Type:Article
Title:Smart cure cycles for fiber metal laminates using embedded fiber Bragg grating sensors
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Prussak, Robertrobert.prussak (at) dlr.deUNSPECIFIED
Kappel, Erikerik.kappel (at) dlr.dehttps://orcid.org/0000-0002-8760-8451
Stefaniak, DanielDaniel.Stefaniak (at) dlr.dehttps://orcid.org/0000-0001-8192-7454
Hühne, Christianchristian.huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Sinapius, Michaelmicsinap (at) tu-braunschweig.deUNSPECIFIED
Date:30 January 2019
Journal or Publication Title:Composite Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:213
DOI :10.1016/j.compstruct.2019.01.079
Page Range:pp. 252-260
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Eigenspannungen, Verzug, Smart Cure Cycles, Processing, FML, Fiber Metal laminates, CFRP, Hybrid structures
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: Kappel, Dr.-Ing. Erik
Deposited On:25 Feb 2019 05:08
Last Modified:25 Feb 2019 05:08

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