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CHARACTERIZATION OF PRODUCTION-INDUCED DEFECTS IN CARBON FIBER REINFORCED THERMOPLASTIC TECHNOLOGY

Fischer, Frederic and Mezakeu Tongnan, Yannick and Beyrle, Matthias and Gerngroß, Tobias and Kupke, Michael (2015) CHARACTERIZATION OF PRODUCTION-INDUCED DEFECTS IN CARBON FIBER REINFORCED THERMOPLASTIC TECHNOLOGY. 7th International Symposium on NDT in Aerospace 2015, 16.-18. Nov. 2015, Bremen. ISBN 978-3-940283-76-4

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Abstract

Advanced thermoplastic composites such as carbon fibre reinforced polyetheretherketone (CF-PEEK) have a great potential for efficient processing. Along the production chain certain manufacturing steps may cause slight, superficial flaws or mere optical effects without greater impact on performance whereas others may lead to severe changes of the final part properties. These production–induced defects can arise already in the early stages of the production chain and may hence cause significant downstream effects. Ultrasonic spot welding is a well-established manufacturing step in aerospace industries. As such, it is applied in preforming to locally melt the matrix of advanced thermoplastic prepregs, to bond stacked layers to one another and later produce a tailored organic sheet or part, e.g. via vacuum consolidation. Depending on the process parameters ultrasonic spot welding may, however, cause detrimental overheating of the laminate, penetration of the horn into the part and disruption of fibres. In this work the influence of production-induced defects on the properties of fully consolidated specimen is investigated and correlated with methods of non-destructive testing. The experimental analysis focusses on the impact of the respective welding and processing parameters on the mechanical performance and the detectability by non-destructive testing, e.g. optical lock-in thermography. The aim is to improve the robustness of the process by detecting, defining and dimishing production-induced defects. In this context, non-destructive testing (NDT) is employed to detect quality issues in an early stage of production.

Item URL in elib:https://elib.dlr.de/104142/
Document Type:Conference or Workshop Item (Speech)
Title:CHARACTERIZATION OF PRODUCTION-INDUCED DEFECTS IN CARBON FIBER REINFORCED THERMOPLASTIC TECHNOLOGY
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fischer, Fredericfrederic.fischer (at) dlr.deUNSPECIFIED
Mezakeu Tongnan, Yannickyannick.mezakeuTongnan (at) dlr.deUNSPECIFIED
Beyrle, Matthiasmatthias.beyrle (at) dlr.deUNSPECIFIED
Gerngroß, Tobiastobias.gerngross (at) dlr.deUNSPECIFIED
Kupke, Michaelmichael.kupke (at) dlr.deUNSPECIFIED
Date:16 November 2015
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:BB 156
Page Range:pp. 1-19
Editors:
EditorsEmail
Hanke, RandolfFraunhofer IIS
Boller, ChristianSaarland University
Purschke, MatthiasDGZfP
Series Name:DGZfP-Proceedings
ISBN:978-3-940283-76-4
Status:Published
Keywords:Composite, Thermoplastic, CFRTP, NDT, Manufacturing defects, Production–Induced Defects, Ultrasonic Welding, CF-PEEK, Thermography
Event Title:7th International Symposium on NDT in Aerospace 2015
Event Location:Bremen
Event Type:international Conference
Event Dates:16.-18. Nov. 2015
Organizer:DGZfP, FhG
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: Augsburg
Institutes and Institutions:Institute of Structures and Design > Automation and Quality Assurance in Production
Deposited By: Fischer, Frederic
Deposited On:01 Dec 2016 11:01
Last Modified:31 Jul 2019 20:01

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