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Development of structural finite element models for aerospace CFRP components
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Aerospace, moveability and naval architecture.
2023 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Utveckling av strukturella finita element modeller för aerospace CFRP komponenter (Swedish)
Abstract [en]

The aerospace sector’s increasing use of composites highlights the need for accuratecharacterization of the material’s properties, particularly regarding failure parameters.This paper goes through the process of physically testing a carbon epoxy composite interms of delamination strength using the ASTM standard in three different mode mixtures.Then, by implementing a Cohesive Zone Modelling approach with a bi-linear tractionseparation law, simulating the coupons in LS-Dyna and performing an iterative correlationprocess to find the material parameters that best replicate the results obtained from the labexperiments.The results showed how the failure load at which the delamination initiates matched theexperimental ones for reasonable values of the material properties, but the displacementat which this load were obtained are noticeably off.In the end, the reason behind this behaviour is discussed and possible solutions forfuture work are presented.

Abstract [sv]

Den ökande användningen av kompositer inom rymdsektorn belyser behovet av noggrannkaraktärisering, särskilt avseende brottparametrar.Denna artikel går igenom processen med fysiskt testning av en kol-epoxi-kompositmed avseende på delamineringssstyrka genom att använda ASTM-standarden i tre olikaförhållanden av felmoder. Sedan, genom att integrera en modellering av kohesiva zonermed en bilinjär drag-separationslag, simuleras kupongerna i LS-Dyna och en iterativkorrelationsprocess utförs för att hitta de materialparametrar som bäst replikerar resultatenfrån labbförsöken.Resultaten visade hur felbelastningen vid vilken delaminering börjar matchade deexperimentella, men förskjutningen vid vilken denna belastning uppnås avviker signifikant.Till sist diskuteras orsaken till detta beteende och möjliga lösningar för framtida arbetepresenteras.

Place, publisher, year, edition, pages
2023.
Series
TRITA-SCI-GRU ; 2023:428
Keywords [en]
CFRP, FEM, CZM, Delamination
Keywords [sv]
CFRP, FEM, CZM, Delaminering
National Category
Vehicle and Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-347874OAI: oai:DiVA.org:kth-347874DiVA, id: diva2:1871461
External cooperation
GKN Aerospace Sweden
Subject / course
Lightweight Structures
Educational program
Master of Science - Aerospace Engineering
Supervisors
Examiners
Available from: 2024-06-17 Created: 2024-06-17 Last updated: 2025-02-14Bibliographically approved

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CiteExportLink to record
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