Influence of specimen configuration on the measurement of the off-axis Young's modulus of wood by vibration tests

摘要

To determine the Young's modulus of solid wood, longitudinal and flexural vibration methods are very effective because the Young's modulus can be measured non-destructively. When the specimen has an off-axis angle, however, the specimen configuration has an influence on the measurement of Young's modulus. Therefore, it is important to reveal the influence of specimen configuration on the measurement of off-axis Young's modulus. In this research, the off-axis Young's modulus of wood was obtained by conducting longitudinal and flexural vibration tests using specimens with various widths and performing a subsequent numerical analysis on the test data. The off-axis Young's modulus was dependent on specimen configuration when the off-axis angle ranged from approximately 5~° to 15~° because the bending and torsional deformations in the longitudinal and flexural vibration tests, respectively, were significant in this range.