Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Woven fabrics (biaxial plain weaves) based on flax yarn for composite reinforcement

Traditional woven fabrics were manufacturing from the optimised pre-yarns by JOB and Jokiipin. Laminates were made by hand lay-up from these biaxial (0/90 degree) woven fabrics and tested by QMUL. The mechanical properties for laminates with a fibre volume fraction of 28% where a strength of 65Mpa and a modulus of 5GPa.

Clearly these values are well below those obtained using uniaxial (0 degree) fabrics by Engtext. The main reason for this being the biaxial fibre orientation with fibre in the 0 and 90 degree orientation. Another reason is that the transfer of fibre properties into composite properties in the case of woven fabrics is generally less efficient because of the crimped structure with the fibres, which may lead to some property loss from fibre to composite.

Analysis of the composite data showed that the fibre efficiency in the woven fabrics is around 80% compared to 100% for non-crimp knitted fabrics. Based on the results obtained so far it is expected that the maximum attainable properties for composites made by vacuum infusion, RTM or pultrusion in the case of typical fibre volume fractions of 40-50% are a stiffness of 10GPa and a strength of around 120MPa. These properties compare again vary favourable with current non-woven composites with strengths around 50MPa and moduli of 6GPa.

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