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

Bo Madsen; Preben Hoffmeyer; Hans Lilholt

doi:10.1016/j.compositesa.2012.07.010

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

Bo Madsen, Preben Hoffmeyer, Hans Lilholt

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

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 language	English
Journal	Composites Part A: Applied Science and Manufacturing
Volume	43
Issue number	11
Pages (from-to)	2151-2160
ISSN	1359-835X
DOIs	https://doi.org/10.1016/j.compositesa.2012.07.010
Publication status	Published - 2012

Keywords

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

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10.1016/j.compositesa.2012.07.010

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title = "Hemp yarn reinforced composites – III. Moisture content and dimensional changes",

abstract = "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.",

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T1 - Hemp yarn reinforced composites – III. Moisture content and dimensional changes

AU - Madsen, Bo

AU - Hoffmeyer, Preben

AU - Lilholt, Hans

PY - 2012

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N2 - 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.

AB - 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.

KW - A. Lignocellulosic fibres

KW - A. Yarn

KW - B. Physical properties

KW - C. Micro-mechanics

U2 - 10.1016/j.compositesa.2012.07.010

DO - 10.1016/j.compositesa.2012.07.010

M3 - Journal article

SN - 1359-835X

VL - 43

SP - 2151

EP - 2160

JO - Composites Part A: Applied Science and Manufacturing

JF - Composites Part A: Applied Science and Manufacturing

IS - 11

ER -

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

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Keywords

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