Journal article
Hemp yarn reinforced composites – III. Moisture content and dimensional changes
Department of Wind Energy, Technical University of Denmark1
Composites Mechanics and Materials Mechanics, Department of Wind Energy, Technical University of Denmark2
Department of Civil Engineering, Technical University of Denmark3
Section for Construction Materials, Department of Civil Engineering, Technical University of Denmark4
Based on a comprehensive set of experimental data it is demonstrated that the moisture properties of aligned hemp fibre yarn/thermoplastic matrix composites are showing low moisture sorption capacity and low dimensional changes. Using a reference humidity of 65% RH, and a common span of ambient humidity levels of 33% and 85% RH, the relative moisture content of composites with a high fibre fraction is ranging from −0.009 at 33% RH and+0.016 at 85% RH, and this lead to relative transverse hygral strains in the range of only −0.007 to+0.011.
The axial hygral strain is practically zero. The moisture content of the composites is shown to be well predicted by a mixtures relationship using the measured moisture contents of the constituents. The dimensional changes of the composites are well predicted by micromechanical models of the transverse and axial hygral strains.
Language: | English |
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Year: | 2012 |
Pages: | 2151-2160 |
ISSN: | 18785840 and 1359835x |
Types: | Journal article |
DOI: | 10.1016/j.compositesa.2012.07.010 |
ORCIDs: | Madsen, Bo |