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Determination of Young's modulus and shear modulus by means of deflection curves for wood beams obtained in static bending tests
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Koji Murata
Published/Copyright:
August 8, 2007
Abstract
Young's modulus and shear modulus were simultaneously obtained in a three-point bending test based on Timoshenko's bending theory. Deflection curves of a bent beam were measured by image analysis, and the mechanical properties of the wood were calculated by polynomial regression analysis after excluding the singular region. When beam specimens of spruce (Picea sp.) and mizunara (Quercus crispula) wood were tested, static Young's modulus (Es) and static shear modulus (Gs) values could be obtained from the deflection curve using finite element analysis. By comparing the dynamic properties (Ed and Gd) obtained by a flexural vibration test, it was estimated that Es was greater than Ed, while Gs was less than Gd. However, we suppose that the Gs values calculated from the deflection curve are more plausible than those obtained from a conventional bending test.
Keywords: digital image correlation; shear modulus; static bending test; Timoshenko theory; Young's modulus
Received: 2006-12-8
Accepted: 2007-4-24
Published Online: 2007-08-08
Published in Print: 2007-8-1
©2007 by Walter de Gruyter Berlin New York
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Keywords for this article
digital image correlation;
shear modulus;
static bending test;
Timoshenko theory;
Young's modulus
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- Determination of the accessible hydroxyl groups in heat-treated Styrax tonkinensis (Pierre) Craib ex Hartwich wood by hydrogen-deuterium exchange and 2H NMR spectroscopy
- Lignin modification in the initial phase of softwood kraft pulp delignification with polyoxometalates (POMs)
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