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Influence of fibre shrinkage and stretching on the mechanical properties of self-reinforced poly(ethylene terephthalate) composite
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. Scania CV, Södertälje, Sweden .ORCID-id: 0000-0001-9909-7620
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.ORCID-id: 0000-0002-6616-2964
2014 (Engelska)Ingår i: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 33, nr 17, s. 1644-1655Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Self-reinforced poly(ethylene terephthalate) composite laminates were manufactured from fabric using a hot press. Fabric was either allowed to shrink or exposed to stretching during different phases of the manufacturing process. Composite macrostructure, crimp, was investigated and results showed that shrinkage affects fibre crimp more than stretching does. Mechanical tests showed that shrinkage do not significantly affect mechanical properties while stretching fabric by 10% during heating results in 50% increase in tensile stiffness. The lack of correlation between crimp and mechanical properties indicates that mechanical properties for self-reinforced poly(ethylene terephthalate) composites are dominated by their microstructure, molecular orientation, which may be affected by the manufacturing process.

Ort, förlag, år, upplaga, sidor
2014. Vol. 33, nr 17, s. 1644-1655
Nyckelord [en]
Self-reinforced composite, poly(ethylene terephthalate), mechanical properties, processing, macrostructure
Nationell ämneskategori
Polymerteknologi Materialteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-151329DOI: 10.1177/0731684414541018ISI: 000340939600008Scopus ID: 2-s2.0-84906667850OAI: oai:DiVA.org:kth-151329DiVA, id: diva2:748071
Forskningsfinansiär
XPRES - Initiative for excellence in production research
Anmärkning

QC 20140918

Tillgänglig från: 2014-09-18 Skapad: 2014-09-18 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Ingår i avhandling
1. Processing of self-reinforced poly(ethylene terephthalate) composites for automotive applications
Öppna denna publikation i ny flik eller fönster >>Processing of self-reinforced poly(ethylene terephthalate) composites for automotive applications
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The vehicles of the future must have less negative environmental impact during their use phase than the vehicles of today in order to avoid major climate change on earth. Consequently electric vehicles are currently under development with the purpose of reducing CO2 emissions when the vehicle is

driven. There are also efforts put in to reducing the weight of vehicles in order to reduce the demand for energy to drive them. One important aspect of weight reduction is that new materials and technologies are developed. Plastic materials have low a density and can therefore be used to reduce the weight of vehicle components and with composite materials there is further potential for weight reduction. Self-reinforced thermoplastic composite materials are materials in which both reinforcement and matrix are thermoplastic materials and thanks to their low density and relatively good mechanical properties, these materials may be used for weight reduction of vehicle components.

 

The aim of this thesis is to study selected process parameters for component manufacturing with self-reinforced poly(ethylene terephthalate) (SrPET) in order to increase knowledge and thereby advance the field of self-reinforced PET composites. This thesis shows that stretching the material in the manufacturing process increases the mechanical performance of the material due to increased orientation of the amorphous phase in the PET reinforcement. However, stretching introduces stresses in the material that give rise to negative shape distortions in the formed component. The degree of stretching during forming must therefore be controlled in order to achieve a robust serial production. The concept of a SrPET component over-moulded for integration of stiffeners and attachments has been evaluated in a life-cycle-assessment. This evaluation shows that the component weight can be reduced compared to technology currently in use and thereby contribute to increased sustainability of transport.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2017
Serie
TRITA-AVE, ISSN 1651-7660 ; 2017:94
Nationell ämneskategori
Kompositmaterial och -teknik
Forskningsämne
Farkostteknik
Identifikatorer
urn:nbn:se:kth:diva-219926 (URN)978-91-7729-651-5 (ISBN)
Disputation
2018-01-26, Kollegiesalen, Brinellvägen 8, Stockholm, 09:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20171215

Tillgänglig från: 2017-12-15 Skapad: 2017-12-14 Senast uppdaterad: 2017-12-15Bibliografiskt granskad

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Jerpdal, LarsÅkermo, Malin

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