Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Recyclable self-reinforced ductile fiber composite materials for structural applications
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0003-1509-8824
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 [en]
Self-reinforced polymer, Composite, sandwich structure, mechanical properties, impact behaviour, finite element
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-174131ISBN: 978-91-7595-679-4 (print)OAI: oai:DiVA.org:kth-174131DiVA: diva2:858046
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
List of papers
1. Compression and tensile properties of self-reinforced poly(ethylene terephthalate)-composites
Open this publication in new window or tab >>Compression and tensile properties of self-reinforced poly(ethylene terephthalate)-composites
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
Keyword
Compression testing, Mechanical properties, Polymer-matrix composite, Self-reinforced
National Category
Vehicle Engineering
Research subject
SRA - Production
Identifiers
urn:nbn:se:kth:diva-116487 (URN)10.1016/j.polymertesting.2012.11.002 (DOI)000316513300009 ()2-s2.0-84872065467 (Scopus ID)
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
2. Dynamic compression response of self-reinforced poly(ethylene terephthalate) composites and corrugated sandwich cores
Open this publication in new window or tab >>Dynamic compression response of self-reinforced poly(ethylene terephthalate) composites and corrugated sandwich cores
2015 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 77, 96-105 p.Article in journal (Refereed) Published
Abstract [en]

A novel manufacturing route for fully recyclable corrugated sandwich structures made from self-reinforced poly(ethylene terephthalate) SrPET composites is developed. The dynamic compression properties of the SrPET material and the out-of-plane compression properties of the sandwich core structure are investigated over a strain rate range 10(-4)-10(3) s(-1). Although the SrPET material shows limited rate dependence, the corrugated. core structures show significant rate dependence mainly attributed to micro-inertial stabilisation of the core struts and increased plastic tangent stiffness of the SrPE"T material. The corrugated SrPET cores have similar quasi-static performance as commercial polymeric foams but the SrPET cores have superior dynamic compression properties.

Keyword
Mechanical Properties, Plastic deformation, Polymer (textile) fibre, Ductile composites
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-173756 (URN)10.1016/j.compositesa.2015.06.016 (DOI)000360420300009 ()2-s2.0-84934757398 (Scopus ID)
Funder
VINNOVA
Note

QC 20150923

Available from: 2015-09-23 Created: 2015-09-18 Last updated: 2017-12-01Bibliographically approved
3. Compression properties of novel thermoplastic carbon fibre and poly-ethylene terephthalate fibre composite lattice structures
Open this publication in new window or tab >>Compression properties of novel thermoplastic carbon fibre and poly-ethylene terephthalate fibre composite lattice structures
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
Keyword
Lattice structures, Self-reinforced polymers, Thermoplastic composites
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-158376 (URN)10.1016/j.matdes.2014.08.032 (DOI)000345520000135 ()2-s2.0-84918554568 (Scopus ID)
Note

QC 20150115

Available from: 2015-01-15 Created: 2015-01-07 Last updated: 2017-12-05Bibliographically approved
4. Energy absorption of self-reinforced poly(ethylene terephtalate) composite sandwich beams under three-point bending
Open this publication in new window or tab >>Energy absorption of self-reinforced poly(ethylene terephtalate) composite sandwich beams under three-point bending
(English)Manuscript (preprint) (Other academic)
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-175322 (URN)
Note

QS 2015

Available from: 2015-10-12 Created: 2015-10-12 Last updated: 2015-10-12Bibliographically approved
5. Impact response of ductile self-reinforced composite corrugated sandwich beams
Open this publication in new window or tab >>Impact response of ductile self-reinforced composite corrugated sandwich beams
Show others...
(English)Manuscript (preprint) (Other academic)
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-175323 (URN)
Note

QS 2015

Available from: 2015-10-12 Created: 2015-10-12 Last updated: 2015-10-12Bibliographically approved
6. A material selection approach to evaluate material substitution for minimizing the life cycle environmental impact of vehicles
Open this publication in new window or tab >>A material selection approach to evaluate material substitution for minimizing the life cycle environmental impact of vehicles
Show others...
2015 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 83, 704-712 p.Article in journal (Refereed) Published
Abstract [en]

Weight reduction is commonly adopted in vehicle design as a means for energy and emissions savings. However, selection of lightweight materials is often focused on performance characteristics, which may lead to sub optimizations of life cycle environmental impact. Therefore systematic material selection processes are needed that integrate weight optimization and environmental life cycle assessment. This paper presents such an approach and its application to design of an automotive component. Materials from the metal, hybrid and polymer families were assessed, along with a novel self-reinforced composite material that is a potential lightweight alternative to non-recyclable composites. It was shown that materials offering the highest weight saving potential offer limited life cycle environmental benefit due to energy demanding manufacturing. Selection of the preferable alternative is not a straightforward process since results may be sensitive to critical but uncertain aspects of the life cycle. Such aspects need to be evaluated to determine the actual benefits of lightweight design and to base material selection on more informed choices.

Keyword
Lightweight design, Material selection, Life cycle assessment, Sandwich structures, Self-reinforced composites
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-173255 (URN)10.1016/j.matdes.2015.06.079 (DOI)000359329000080 ()2-s2.0-84941312731 (Scopus ID)
Note

QC 20150911

Available from: 2015-09-11 Created: 2015-09-09 Last updated: 2017-09-08Bibliographically approved

Open Access in DiVA

Spikblad(202 kB)13 downloads
File information
File name SPIKBLAD01.pdfFile size 202 kBChecksum SHA-512
360d0faf237e64fd9bca982d2dd018bfde07ec8244d882d71284d1c5e976714ef46503375355c5d02ce14d92bebb6c7e04db2b5f59c0663f692736aa83aa5f26
Type spikbladMimetype application/pdf
Thesis(5285 kB)579 downloads
File information
File name FULLTEXT01.pdfFile size 5285 kBChecksum SHA-512
c50658d47ed4d6ec5eaf83dd1c31e46c8114550c59522492f6fe8b307ecbbe57d5e60851560932dca6a67db0757cf439fee238a589e9701ac93ebf275c589210
Type fulltextMimetype application/pdf

Authority records BETA

Schneider, Christof

Search in DiVA

By author/editor
Schneider, Christof
By organisation
Lightweight Structures
Vehicle Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 579 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 245 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf