Identification of true microstructure of composites based on various flax fibre assemblies by means of three-dimensional tomography

Arttu Miettinen, Roberts Joffe, Liva Pupure, Bo Madsen

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Abstract

Lately it has been demonstrated that natural fibres may be an environmentally superior alternative for, e.g., glass fibres. In order to estimate properties of composite materials made of natural fibres, models designed for synthetic fibres are often used. The models usually do not account for irregularities in the material, e.g., suboptimal fibre orientation due to the twisting angle of fibres in yarns. Use of models without taking those features into account might lead to unreliable results. Methods to quantify the microstructural properties of natural fibre composites with X-ray microtomography and three-dimensional image analysis are demonstrated in this work. The methods are applied to flax fibre composites made from three different kinds of pre-forms. Microstructural parameters estimated with the methods are used in micromechanical models for the stiffness of the composite. Comparison between rule-of-mixtures and classical laminate theory is made, highlighting the requirement for accurate parameter estimation and use of a model that accounts for significant structural features of the material.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Composite Materials
Number of pages8
PublisherICCM20 Secretariat
Publication date2015
Publication statusPublished - 2015
Event20th International Conference on Composite Materials (ICCM20) - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015
Conference number: 20

Conference

Conference20th International Conference on Composite Materials (ICCM20)
Number20
CountryDenmark
CityCopenhagen
Period19/07/201524/07/2015

Keywords

  • Adhesive joints
  • Crack propagation
  • Fracture mechanics
  • Trailing edge damage
  • Wind turbine blade

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