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Shape Distortion Analysis of Self-Reinforced Poly(ethylene terephthalate) Composites: The PETrifying reality!
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Composite components with a V-shaped geometry have been manufactured through compression moulding of fabrics based on self-reinforced poly(ethylene terephthalate). The fabrics were subjected to a set of predetermined degrees of stretching during manufacturing with the intent to investigate its effects on shape distortions in terms of spring-in and warping. The shape distortions were also monitored as the components were subjected to sawing, a secondary heat treatment and a secondary chemical treatment. Moreover, to a limited extent the effects of weave architecture and pattern orientation were also studied as both twill and plain weaves used and the fabrics were rotated a relative angle of 45°. The shape distortions in these were then compared with shape distortions in both un-stretched self-reinforced poly(ethylene terephthalate) and traditional composite components based on glass/poly(ethylene terephthalate) and carbon/poly(ethylene terephthalate). Laser scanning measurements of the surfaces showed that fibre stretching counteracted spring-in while causing warping in the components during manufacturing. Sawing had limited effects on the components while heating increased spring-in but reduced warping. The chemical treatment increased both the spring-in and warping to a smaller and larger extent than the heat treatment, respectively. Overall the carbon fibre components performed best but the self-reinforced poly(ethylene terephthalate) performed better than the glass fibre ones. Lastly, both the secondary processing steps had a negative effect on the surface quality.

Abstract [sv]

V-formade kompositartiklar har tillverkats genom formpressning av vävar bestående av självförstärkt polyetentereftalat. Under tillverkningsfasen utsattes materialet för förutbestämda sträcknings grader samt tilläts förblev osträckt med för avsikt att kartlägga fibersträckningen påverkan på formförändringar så som spring-in och skevning. Effekterna av sågning, värme- och kemikalieytbehandling på uppkomsten av formförändringar inspekterades. Utöver detta undersöktes även effekten av vävstruktur (tuskaft och twill testades) samt orientering av dessa, då de utsattes för en relativ rotation på 45°, i viss omfattning. Dessutom utfördes en jämförelse mellan de inducerade formförändringarna i de självförstärkta polyetentereftalat komponenterna och mer traditionella kompositkomponenter baserade på glasfiber/polyetentereftalat samt kolfiber/polyetentereftalat för fallet med osträckt material. De erhållna resultaten påvisar att fibersträckning minskade spring-in-vinkeln i komponenteran efter tillverkning medan skevning istället uppstod. Sågning hade en begränsad effekt på formförändringarna. Värmebehandlingen hade större påverkan på komponenterna och resulterade i en ökande spring-in-vinkel men dock en minskad skevning. Kemikaliernas påverkan på spring-in-vinkeln var relativt liten i relation till värmebehandlingen medan påverkan på skevningen var mer påtaglig. Överlag presterade kolfiberkomponenterna bäst emellertid klarade sig de självförstärkta komponenterna i regel bättre än glasfiberkomponenterna. Båda efterbehandlingsprocesserna påverkade texturen på komponentera som blev märkbart grövre och strävare.

Place, publisher, year, edition, pages
2016. , p. 55
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:59
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-203276OAI: oai:DiVA.org:kth-203276DiVA, id: diva2:1081937
External cooperation
Scania
Subject / course
Lightweight Structures
Examiners
Available from: 2017-03-15 Created: 2017-03-15 Last updated: 2017-03-15Bibliographically approved

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