Properties of cell wall constituents in relation to longitudinal elasticity of wood |
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Authors: | H Yamamoto Y Kojima |
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Institution: | (1) Department of Bio-materials sciences, School of Bio-agricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan e-mail: hiro@agr.nagoya-u.ac.jp, JP |
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Abstract: | To predict the origin of longitudinal elasticity of the solid wood in relation to the composite structure of the wood cell
wall, an analytical procedure was developed on the basis of the idea of “the reinforced-matrix hypothesis” originally introduced
by Barber and Meylan (1964). A multi-layered circular cylinder, having the CML, the S1, and the S2 layers, was used as a model
of the ligno-cellulosic (wood) fiber, and the elastic properties of an isolated wood fiber were formulated mathematically.
In the formulation, not only the structural factors, such as the microfibril angle and the thickness of each layer, but also
the environmental condition, e.g. the moisture content, were taken into consideration. The effects of the moisture content
and the microfibril angle upon the longitudinal Young's modulus and the Poisson's ratio of the wood fiber were simulated by
using the newly derived formulae. It is anticipated to give a start to estimate the fine structure and the internal properties
of the cell wall constituents in relation to the macroscopic behaviors of the wood through simulating the mechanical behaviors
of the wood fiber.
Received 17 August 1999 |
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