Hemp yarn reinforced composites – III. Moisture content and dimensional changes

Bo Madsen, Preben Hoffmeyer, Hans Lilholt

    Research output: Contribution to journalJournal articleResearchpeer-review


    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.
    Original languageEnglish
    JournalComposites Part A: Applied Science and Manufacturing
    Issue number11
    Pages (from-to)2151-2160
    Publication statusPublished - 2012


    • A. Lignocellulosic fibres
    • A. Yarn
    • B. Physical properties
    • C. Micro-mechanics


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