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Contribution of Wood Fiber Hygroexpansion to Moisture Induced Thickness Swelling of Composite Plates by Karin M. Almgren; E. Kristofer Gamstedt; Janis Varna is a Materials Science article available to read on EtoBox.

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## Abstract One of the main drawbacks of wood fiber‐based composite materials is their propensity to swell due to moisture uptake. Because the wood fibers are usually the main contributor to hygroexpansion, it is of interest to quantify the hygroexpansion coefficient of wood fibers, to compare and rank different types of fibers. This investigation outlines an inverse method to estimate the transverse hygroexpansion coefficient of wood fibers based on measurements of moisture induced thickness swelling of composite plates. The model is based on composite micromechanics and laminate theory. Thickness swelling has been measured on polylactide matrix composites with either bleached reference fibers or crosslinked fibers. The crosslinking modification reduced the transverse hygroexpansion of the composites and the transverse coefficient of hygroexpansion of the fibers was reduced from 0.28 strain per relative humidity for reference fibers to 0.12 for cross‐linked fibers. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers

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Author

Karin M. Almgren; E. Kristofer Gamstedt; Janis Varna

Publisher

Society for Plastic Engineers; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0272-8397)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)