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On a simultaneous use of fiber-Bragg-gratings and strain-gages to determine the stress-free temperature Tsf during GLARE manufacturing

Kappel, Erik and Prussak, Robert and Johannes, Wiedemann (2019) On a simultaneous use of fiber-Bragg-gratings and strain-gages to determine the stress-free temperature Tsf during GLARE manufacturing. Composite Structures, 227, pp. 269-279. Elsevier. doi: 10.1016/j.compstruct.2019.111279. ISSN 0263-8223.

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S0263822319308384

Abstract

Process-induced residual stresses in fiber-metal laminates depend on the stress-free temperature, which refers to the moment during the manufacturing process where a resilient mechanical connection between metal and fiber-reinforced epoxy layers is established. The stress free temperature is often determined reversely by evaluating distortions of FML specimens with asymmetric layup. The present paper focusses on an in situ strain-measurement-based procedure, which allows for the direct determination of the stress-free temperature during manufacturing. The paper reports on a combined application of strain-gage and fiber-Bragg sensors, during manufacturing of a GLARE laminate in an oven environment. The experiment setup allowed for the simultaneous measuring of strains in both constituents along the entire fabrication process. The in situ technique gives insight into mechanical interactions of the GLARE constituents during processing. As will be shown, the stress free temperature can be identified from the monitored strains and therefrom, the material’s residual stress state is quantified.

Item URL in elib:https://elib.dlr.de/130801/
Document Type:Article
Title:On a simultaneous use of fiber-Bragg-gratings and strain-gages to determine the stress-free temperature Tsf during GLARE manufacturing
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kappel, ErikErik.Kappel (at) dlr.dehttps://orcid.org/0000-0002-8760-8451
Prussak, RobertRobert.Prussak (at) dlr.dehttps://orcid.org/0000-0002-9777-0495
Johannes, WiedemannJ.Wiedemann (at) tu-braunschweig.deUNSPECIFIED
Date:1 August 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:227
DOI :10.1016/j.compstruct.2019.111279
Page Range:pp. 269-279
Editors:
EditorsEmailEditor's ORCID iD
Ferreira, A. J. M.Depto. de Engenharia Mecanica, Universidade do Porto, Rua Dr Roberto FriasUNSPECIFIED
Publisher:Elsevier
ISSN:0263-8223
Status:Published
Keywords:Fiber metal laminates, Process monitoring, Residual stresses, Autoclave manufacturing, Smart cure cycle
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Prussak, Robert
Deposited On:19 Nov 2019 05:29
Last Modified:19 Nov 2019 05:29

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