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Influence of Crimp on 3D-woven Fibre Reinforced Composites
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
2013 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 95, 114-122 p.Article in journal (Refereed) Published
Abstract [en]

Three analytical models are developed for prediction of the longitudinal Young's modulus of carbon fibre composite materials containing fully interlaced 3D-woven textile reinforcement. Two of the non-linear models utilise rods and springs and are designed to handle an idealised periodic repetitive volume element of the composite material. For validation, an experimental study is performed, and a more detailed model is built using existing textile software (TexGen and WiseTex). All models are employed to explore the effect of three-dimensional yarn crimp on the longitudinal Young's modulus, and they give at hand that the longitudinal stiffness decreases non-linearly with increasing crimp. One of the proposed models agrees particularly well with the experimental results but there are also a few sources of discrepancy, such as shape distortions in the textile architecture.

Place, publisher, year, edition, pages
2013. Vol. 95, 114-122 p.
Keyword [en]
3D weave, Carbon fibre composite materials, Crimp, Detailed models, Experimental studies, Fibre reinforced composites, Longitudinal stiffness, Longitudinal Young's modulus, Non-linear model, Shape distortions, Textile composite, Volume elements, Woven textiles
National Category
Vehicle Engineering Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:kth:diva-10234DOI: 10.1016/j.compstruct.2012.07.022ISI: 000311859400014Scopus ID: 2-s2.0-84868120835OAI: oai:DiVA.org:kth-10234DiVA: diva2:211945
Note

QC 20121207

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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