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Journal article

Plant fibre composites - porosity and stiffness

By Madsen, Bo1,2,3; Thygesen, Anders3,4,5; Lilholt, Hans1,2,3

From

Composites and Materials Mechanics, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1

Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2

Risø National Laboratory for Sustainable Energy, Technical University of Denmark3

Bioenergy and Biomass, Biosystems Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4

Biosystems Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark5

Plant fibre composites contain typically a relatively large amount of porosity which influences their performance. A model, based on a modified rule of mixtures, is presented to include the influence of porosity on the composite stiffness. The model integrates the volumetric composition of the composites with their mechanical properties.

The fibre weight fraction is used as an independent parameter to calculate the complete volumetric composition. A maximum obtainable stiffness of the composites is calculated at a certain transition fibre weight fraction, which is characterised by a best possible combination of high fibre volume fraction and low porosity.

The model is validated with experimental data from the literature on several types of composites. A stiffness diagram is presented to demonstrate that the calculations can be used for tailoring and design of composites with a given profile of properties. (C) 2009 Elsevier Ltd. All rights reserved.

Language: English
Year: 2009
Pages: 1057-1069
ISSN: 18791050 and 02663538
Types: Journal article
DOI: 10.1016/j.compscitech.2009.01.016
ORCIDs: Madsen, Bo and Thygesen, Anders
Keywords

Lette stærke materialer til vindmøller og til transport Light strong materials for wind turbines and for transportation Materialeforskning Materials research

Other keywords

A. Plant fibre composites B. Mechanical properties B. Porosity/voids C. Modelling

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