Strain-softening behavior of wood under tension perpendicular to the grain |
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Authors: | Kazunari Miyauchi Koji Murata |
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Institution: | (1) Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyoku, Kyoto 606-8502, Japan |
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Abstract: | Three softwood samples and one hardwood sample were tested under a tension load applied along the radial direction using small
clear specimens and the local tension strain was measured using the digital image correlation method. We successfully obtained
a stress-strain curve with a strain-softening branch by calculating the stress using the strain distributions in the vicinity
where the specimen ruptured. The continuous digital imaging of the specimen proved to be very effective for measuring the
strain in quasi-brittle materials such as wood under tension. The nonlinearity of the stress-strain curve was quantified using
two parameters representing the deviation from linear elasticity, and the formula of the stress-strain curve was deduced from
the interrelation between these parameters. This formula is expressed quite simply by using the modulus of elasticity along
the radial direction and another constant that is unique to the material.
Part of this article was presented at the 56th Annual Meeting of the Japan Wood Research Society, Akita, Japan, August 2006 |
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Keywords: | Strain softening Tension Digital image correlation Nonlinearity Perpendicular to grain |
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