Abstract
We examined the feasibility of estimation methods for measuring Young's modulus of wood by the three-point bending test using spruce specimens (Picea sitchensis Carr.). By measuring the deflections at the midspan and at the midpoint between the loading and supporting points, Young's moduli were determined according to elementary and Timoshenko's beam theory. Additionally, longitudinal strain at the midspan was measured independently of measuring the deflections, and Young's modulus was also determined from the load-strain relation. The values of Young's modulus obtained by the different procedures were compared with each other, and the following results were obtained: (1) Measurement of two-point deflections was effective for obtaining Young's modulus while reducing the influence of shear deformation when the specimen had a small depth. (2) In the measurement of two-point deflections, the specimen configuration should be regarded as more important than the contact at the loading and supporting points. (3) The use of strain gauges should be taken into account as a standardized method for measuring Young's modulus by bending.
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