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Compression properties of novel thermoplastic carbon fibre and poly-ethylene terephthalate fibre composite lattice structures
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0003-1509-8824
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Transilvania University of Brasov, Romania .
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-9744-4550
2015 (English)In: Materials & Design, ISSN 0261-3069, Vol. 65, 1110-1120 p.Article in journal (Refereed) Published
Abstract [en]

A novel manufacturing route to efficiently produce fibre composite lattice structures has been developed. By using thermoplastic composite materials, flat sheets have been continuously folded, cut into a lattice shape and joined into a sandwich structure. Carbon fibre reinforced poly-ethylene terephthalate (CPET) and poly-ethylene terephthalate fibre reinforced poly-ethylene terephthalate (SrPET) materials have been used to explore two different core options; a carbon fibre option which gives high performance but low recyclability and a single polymer PET option which gives lower performance but full recyclability. Parametric numerical simulations have been used to investigate how the various manufacturing parameters affect the mechanical performance of the core. The carbon fibre composite cores have mechanical performance on-par or better than existing metallic and composite lattice cores presented in literature. Single polymer PET cores show better performance compared to high-end foam cores but have considerable lower performance than carbon fibre lattice cores.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 65, 1110-1120 p.
Keyword [en]
Lattice structures, Self-reinforced polymers, Thermoplastic composites
National Category
Other Materials Engineering
URN: urn:nbn:se:kth:diva-158376DOI: 10.1016/j.matdes.2014.08.032ISI: 000345520000135ScopusID: 2-s2.0-84918554568OAI: diva2:780792

QC 20150115

Available from: 2015-01-15 Created: 2015-01-07 Last updated: 2015-10-12Bibliographically approved
In thesis
1. Recyclable self-reinforced ductile fiber composite materials for structural applications
Open this publication in new window or tab >>Recyclable self-reinforced ductile fiber composite materials for structural applications
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lightweight structures in vehicles are a proven way to reduce fuel consumption and the environmental impact during the use. Lower structural weight can be achieved by using high performance materials such as composites or using the material efficiently as a sandwich structure. Traditional composite materials such as carbon or glass fiber reinforced polymers have high weight specific mechanical properties but are inherently brittle and expensive. They consist of at least two different materials making recycling a difficult endeavor.The best composite material would have good weight specific properties and is ductile, cheap and comprises of a reinforcement and matrix material based on the same recyclable material making recycling easy. In self-reinforced polymer (SrP) composite materials, reinforcing fibers and matrix material are based on the same recyclable thermoplastic polymer making recycling to a straightforward process. SrP composite materials are ductile, inexpensive and have a high energy absorption potential. The aim of this thesis is to investigate the potential of SrP composites in structural applications. Firstly, the quasi-static and dynamic tensile and compression properties of a self-reinforced poly(ethylene terephthalate) (SrPET) composite material are investigated confirming the high energy absorption potential. Sandwich structures out of only SrPET with a lattice core are manufactured and tested in quasi-static out-of-plane compression showing the potential of SrPET as core material. Corrugated sandwich structured out of only SrPET are manufactured and tested in out-of-plane compression over a strain rate range10−4 s−1 - 103 s−1. The corrugated SrPET core has similar quasi-static properties as commercial polymeric foams but superior dynamic compression properties. Corrugated sandwich beams out of only SrPET are manufactured and tested in quasi-static three-point bending confirming the high energy absorption potential of SrPET structures. When comparing the SrPET beams to aluminum beams with identical geometry and weight, the SrPET beams shows higher energy absorption and peak load. The experimental results show excellent agreement with finite element predictions. The impact behaviorof corrugated SrPET sandwich beams during three-point bending is investigated. When comparing SrPET sandwich beams to sandwich beams with carbon fiber face sheets and high performance thermoset polymeric foam with the same areal weight, for the same impact impulse per area, the SrPET shows less mid-span deflection.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. ix, 49 p.
TRITA-AVE, ISSN 1651-7660 ; 2015:61
Self-reinforced polymer, Composite, sandwich structure, mechanical properties, impact behaviour, finite element
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
urn:nbn:se:kth:diva-174131 (URN)978-91-7595-679-4 (ISBN)
Public defence
2015-11-09, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (English)

QC 20151012

Available from: 2015-10-12 Created: 2015-09-30 Last updated: 2015-10-12Bibliographically approved

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