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Assessment of the mechanical properties of a new 3D woven fibre  composite material
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: 0000-0002-9207-3404
2009 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 69, no 11-12, 1686-1692 p.Article in journal (Refereed) Published
Abstract [en]

Fully interlaced 3D fabric is produced by a new weaving technology, and it is here utilised to produce woven carbon fibre preforms, which are then used as reinforcement in composite materials. The purpose of this study is to assess the mechanical performance of this new type of composite material. A prototype loom was used to weave preforms with a rectangular cross-section where all warp and weft yarns were fully interlaced in plain weave. Tensile, compressive, out-of-plane, shear and flexural properties of the composite flat beam specimens were tested. The in-plane stiffness and strength were found to be lower, while the out-of-plane properties were higher compared to conventional 2D laminates. In terms of strength, it was not possible to quantify the difference, since the specimens with 3D woven material exhibited other failure modes than those tested for.

Place, publisher, year, edition, pages
Elsevier , 2009. Vol. 69, no 11-12, 1686-1692 p.
Keyword [en]
3D weaves, textile composites, mechanical properties
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-10233DOI: 10.1016/j.compscitech.2008.04.047ISI: 000268522500003Scopus ID: 2-s2.0-67649121747OAI: oai:DiVA.org:kth-10233DiVA: diva2:211942
Projects
MOJO
Note

QC 20101029. Uppdaterad från In press till Published (20101029). QC 20150729. QC 20160129

Available from: 2009-04-20 Created: 2009-04-20 Last updated: 2017-12-13Bibliographically approved
In thesis
1. An Introduction to the Mechanics of 3D-Woven Fibre Reinforced Composites
Open this publication in new window or tab >>An Introduction to the Mechanics of 3D-Woven Fibre Reinforced Composites
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: Institutionen för Farkost och Flyg, 2009. 29 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2009-20
Keyword
3D weave, 3D reinforcement, Textile Composites, Mechanical properties, crimp
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-10235 (URN)978-91-7415-295-1 (ISBN)
Presentation
2009-05-08, S40, Teknikringen 8, Stockholm, 13:15 (English)
Opponent
Supervisors
Projects
MOJO
Note
QC 20120131Available from: 2009-05-06 Created: 2009-04-20 Last updated: 2012-01-31Bibliographically approved
2. 3D-woven Reinforcement in Composites
Open this publication in new window or tab >>3D-woven Reinforcement in Composites
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Composites made from three-dimensional (3D) textile preforms can reduce  both the weight and manufacturing cost of advanced composite structures  within e.g. aircraft, naval vessels and blades of wind turbines. In this thesis composite beams reinforced with 3D weave are studied, which are intended for use as joining elements in a boltless modular design. 

In practice, there are a few obstacles on the way to realise the modular boltless design. There is lack of experimental data and more importantly, lack of experience and tools to predict the properties of composites reinforced with 3D-weaves. The novel material will not be accepted and used in engineering applications unless proper design methods are available. 

The overall aim of this thesis is to remedy these deficiencies by generating data, experience and a foundation for the development of adequate design methods. 

In Paper A, an initial experimental study is presented where the mechanical properties of 3D-weave reinforced composites are compared with corresponding properties of 2D-laminates. The conclusion from Paper A is that the out- of-plane properties are enhanced, while the in-plane stiffness and strength is reduced. 

In Paper B the influential crimp parameter is investigated and three analytical models are proposed. The warp yarns exhibit 3D crimp which had a large effect the predicted Young’s modulus as expected. The three models have different levels of detail, and the more sophisticated models generate more reliable predictions. However, the overall trends are consistent for all models. 

A novel framework for constitutive modelling of composites reinforced with 3D-woven preforms is presented in Papers C and D. The framework enables predictive modelling of both internal architecture and mechanical properties of composites containing 3D textiles using a minimum of input parameters. The result is geometry models which are near authentic with a high level of detail in features compared with real composite specimens. The proposed methodology is therefore the main contribution of this thesis to the field of composite material simulation. 

Paper E addresses the effect of crimp and different textile architectures on the mechanical properties of the final composite material. Both stiffness and strength decreases non-linearly with increasing crimp. Furthermore specimens containing 3D-woven reinforcement exhibit non-linear stress-strain behaviour in tension, believed to be associated with relatively early onset of matrix shear cracks. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. ix, 38 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2012:01
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-70438 (URN)978-91-7501-245-2 (ISBN)
Public defence
2012-02-17, Sal F3, Lindstedsvägen 26, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20120131

Available from: 2012-01-31 Created: 2012-01-30 Last updated: 2013-04-11Bibliographically approved

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Hallström, Stefan

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