Development and experimental validation of a continuum micromechanics model for the elasticity of wood

De Borst, K., Hellmich, C. and Eberhardsteiner, J. (2005) Development and experimental validation of a continuum micromechanics model for the elasticity of wood. European Journal of Mechanics - A/Solids, 24(6), pp. 1030-1053. (doi:10.1016/j.euromechsol.2005.05.006)

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Abstract

This contribution covers the development and validation of a microelastic model for wood, based on a four-step homogenization scheme. At a length scale of several tens of nanometers, hemicellulose, lignin, and water are intimately mixed, and build up a polymer (polycrystal-type) network. At a length scale of around one micron, fiberlike aggregates of crystalline and amorphous cellulose are embedded in an contiguous polymer matrix, constituting the so-called cell wall material. At a length scale of about one hundred microns, the material softwood is defined, comprising cylindrical pores (lumen) in the cell wall material of the preceding homogenization step. Finally, at a length scale of several millimeters, hardwood comprises larger cylindrical pores (vessels) embedded in the softwood-type material homogenized before. Model validation rests on statistically and physically independent experiments: The macroscopic stiffness values (of hardwood or softwood) predicted by the micromechanical model on the basis of tissue-independent (‘universal’) phase stiffness properties of hemicellulose, amorphous cellulose, crystalline cellulose, lignin, and water (experimental set I) for tissue-specific composition data (experimental set IIb) are compared to corresponding experimentally determined tissue-specific stiffness values (experimental set IIa).

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:De Borst, Dr Karin
Authors: De Borst, K., Hellmich, C., and Eberhardsteiner, J.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:European Journal of Mechanics - A/Solids
Publisher:Elsevier Masson SA
ISSN:0997-7538
ISSN (Online):1873-7285

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