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Compression and tensile properties of self-reinforced poly(ethylene terephthalate)-composites
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0003-1509-8824
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0002-6616-2964
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0002-9744-4550
2013 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 32, no 2, 221-230 p.Article in journal (Refereed) Published
Abstract [en]

Tensile and compression properties of self-reinforced poly(ethylene terephthalate) (SrPET) composites has been investigated. SrPET composites or all-polymer composites have improved mechanical properties compared to the bulk polymer but with maintained recyclability. In contrast to traditional carbon/glass fibre reinforced composites, SrPET composites are very ductile, resulting in high failure strains without softening or catastrophic failure. In tension, the SrPET composites behave linear elastically until the fibre-matrix interface fails, at which point the stiffness starts decreasing. As the material is further strained, strain hardening occurs and the specimen finally fails at a global strain above 10%. In compression, the composite initially fails through fibre yielding, and at higher strains through fibre bending. The stress-strain response is reminiscent of an elastic-perfectly plastic material with a high strain to failure (typically over 10%). This indicates that SrPET composites are not only candidates as semi-structural composites but also as highly efficient energy absorbing materials.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 32, no 2, 221-230 p.
Keyword [en]
Compression testing, Mechanical properties, Polymer-matrix composite, Self-reinforced
National Category
Vehicle Engineering
Research subject
SRA - Production
Identifiers
URN: urn:nbn:se:kth:diva-116487DOI: 10.1016/j.polymertesting.2012.11.002ISI: 000316513300009Scopus ID: 2-s2.0-84872065467OAI: oai:DiVA.org:kth-116487DiVA: diva2:589906
Projects
Centre of ECO2 Vehicle Design
Funder
XPRES - Initiative for excellence in production researchVINNOVA
Note

QC 20130213

Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2017-12-06Bibliographically 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.
Series
TRITA-AVE, ISSN 1651-7660 ; 2015:61
Keyword
Self-reinforced polymer, Composite, sandwich structure, mechanical properties, impact behaviour, finite element
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
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)
Opponent
Supervisors
Projects
ECO2
Funder
VINNOVA
Note

QC 20151012

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

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Schneider, ChristofÅkermo, MalinZenkert, Dan

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