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Koji Murata, Tsubasa Kanazawa

Determination of Young's modulus and shear modulus by means of deflection curves for wood beams obtained in static bending tests

Keywords: digital image correlation, shear modulus, static bending test, Timoshenko theory

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 (E_s) and static shear modulus (G_s) values could be obtained from the deflection curve using finite element analysis. By comparing the dynamic properties (E_d and G_d) obtained by a flexural vibration test, it was estimated that E_s was greater than E_d, while G_s was less than G_d. However, we suppose that the G_s values calculated from the deflection curve are more plausible than those obtained from a conventional bending test.

Holzforschung, Walter de Gruyter

Print ISSN: 0018-3830
Volume: 61, 08/2007
Pages: 589 - 594

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