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Spatial modelling of 3D-woven textiles
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
2012 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 94, no 5, 1495-1502 p.Article in journal (Refereed) Published
Abstract [en]

When analysing for instance permeability and mechanical behaviour of advanced textiles, a representative description of the textiles' architecture is desired. Realistic geometric representations of textiles are however often either difficult to obtain due to limitations in modelling tools, or judged unfeasible to generate due to unreasonable modelling efforts. In this paper a scheme is presented that enables modelling of the internal strand geometry including details of the strand path and smoothly varying cross-section size and shape, on a meso-scale. The main modelling artifice is to initially model the strand perimeters as inflatable tubes in an explicit finite element simulation. The tubes are initially made slender to avoid strand inter-penetration, and then expanded under general contact conditions until the desired volume fraction of strand is reached. For validation a model is compared with pictures from a computer tomography scan of a 3-dimensionally woven carbon fibre preform. The correlation between the simulated geometry and the real sample is striking. The results also indicate that the approach is relatively robust in terms of sensitiveness to variations of input data and starting conditions.

Place, publisher, year, edition, pages
2012. Vol. 94, no 5, 1495-1502 p.
Keyword [en]
3D weave, 3D textile, Composites, Geometric model, Crimp, Preform
National Category
Textile, Rubber and Polymeric Materials Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-70399DOI: 10.1016/j.compstruct.2011.12.003ISI: 000302980400002Scopus ID: 2-s2.0-84858699039OAI: oai:DiVA.org:kth-70399DiVA: diva2:486226
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20120131

Available from: 2012-01-30 Created: 2012-01-30 Last updated: 2017-12-08Bibliographically approved
In thesis
1. 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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