Properties of piezoelectric voltage considering the microscopic structure of wood cell walls
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Takahisa Nakai
Abstract
The combined effects of the grain-angle (θ) and the microfibril angle (MFA) on the piezoelectric voltage (P) are discussed for a wood specimen subjected to unidirectional stress. The fiber axis of the specimen investigated was not parallel to the loading direction. A theoretical discussion is provided concerning fundamental elastic equations that predict the elastic strain field in the crystalline cellulose microfibril (CMF). It was assumed that an ideal wood specimen could be represented by a multi-tracheid model consisting mainly of the middle layer of the secondary wall. Experimental results revealed that plots of the piezoelectric voltage (P) versus the grain angle (θ) show concave curves with a maximum at θ=45°, regardless of MFA in the specimen. A similar tendency was obtained for the relationship predicted between the average shear strain along the CMF and θ. The results indicate that generation of a shear strain in the CMF positively contributes to the piezoelectric effect in wood.
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- Papermaking properties of the ECF-bleached kraft pulps from first-thinning Scots pine (Pinus sylvestris L.)
- Syntheses and properties of liquefied products of ozone treated wood/epoxy resins having high wood contents
- Quality control of thermally modified timber: Interrelationship between heat treatment intensities and CIE L*a*b* color data on homogenized wood samples
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- Dynamic mechanical analysis of dry wood: Linear viscoelastic response region and effects of minor moisture changes
- Material properties and their interrelation in chemically modified clear wood of Scots pine
- Effect of treatments with 1,3-dimethylol-4,5-dihydroxy-ethyleneurea (DMDHEU) on the tensile properties of wood
- Penetration of amino-silicone micro- and macro-emulsions into Scots pine sapwood and the effect on water-related properties
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- Heat and mass transfer in wood composite panels during hot pressing: Part 3. Predicted variations and interactions of the pressing variables
- Heat and mass transfer in wood composite panels during hot pressing: Part 4. Experimental investigation and model validation
- Dielectric relaxation of water adsorbed on wood and charcoal
- Properties of piezoelectric voltage considering the microscopic structure of wood cell walls
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