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Experimental investigations on residual stresses during the fabrication of intrinsic CFRP-steel laminates

Prussak, Robert and Stefaniak, Daniel and Hühne, Christian and Sinapius, Michael (2016) Experimental investigations on residual stresses during the fabrication of intrinsic CFRP-steel laminates. In: Euro Hybrid - Materials and structures 2016 - Proceedings. Deutsche Gesellschaft für Materialkunde e.V. Euro Hybrid Materials and Structures 2016, 20.-21. April 2016, Kaiserslautern.

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This paper focuses on process-related thermal residual stress in fibre metal laminates, consisting of thin steel foils and CFRP prepreg layers. Different process modifications during fabrication were investigated, modifying temperature, pressure and the vacuum bagging arrangement. The impact of these parameters is measured on the deflection of asymmetrical specimens, enabling the evaluation of the potential of specific configurations. For detailed investigations, a cure monitoring system with fibre bragg grating (FBG) sensors was used to measure the in-plane strains during processing. The investigations show a relationship between cure reaction and processing strains. This allows the characterisation of the co-cure bonding process and the resulting residual stress state in nearly any FML configuration. A new method is presented for quantitative predictions of residual stresses in CFRP-steel laminates. It is characterized by the subsequent removal of the steel layers and in-situ measurements of the resulting strain changes with the help of embedded FBG-sensors.

Item URL in elib:https://elib.dlr.de/104183/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental investigations on residual stresses during the fabrication of intrinsic CFRP-steel laminates
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Prussak, Robertrobert.prussak (at) dlr.deUNSPECIFIED
Stefaniak, Danieldaniel.stefaniak (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Sinapius, Michaelmichael.sinapius (at) dlr.deUNSPECIFIED
Date:April 2016
Journal or Publication Title:Euro Hybrid - Materials and structures 2016 - Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iD
Publisher:Deutsche Gesellschaft für Materialkunde e.V
Series Name:Euro Hybrid - Materials and Structures
Keywords:fibre metal laminate, residual stress, co-cure bonding, process monitoring, FBG
Event Title:Euro Hybrid Materials and Structures 2016
Event Location:Kaiserslautern
Event Type:international Conference
Event Dates:20.-21. April 2016
Organizer:Institute of Composite Materials, Kaiserslautern
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:16 Oct 2016 10:23
Last Modified:16 Oct 2016 10:23

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