Title: Effect of moisture sorption state on vibrational properties of wood
Author: Jiang, Jiali; Cai, Zhiyong; Lu, Jianxiong
Source: Proceedings of the 16th International Symposium on Nondestructive Testing and Evaluation of Wood, October 12-14, 2009, Beijing, China. Beijing, China : Beijing Forestry University, c2009: p. 177-183.
Description: The purpose of this study was to investigate the vibrational properties of wood during different states of moisture sorption. The dynamic cantilever vibration experiments were performed on Maple (Acer spp.) and Red oak (Quercus borealis Michx.f.) specimens. The dynamic modulus of elasticity (dynamic MOE) and log-decrement were examined as a function of grain orientation during moisture adsorption and desorption processes. It was observed that the dynamic MOE was higher during desorption process compared to adsorption process at a given moisture content, while the log-decrement showed an opposite trend. The dynamic MOE and log-decrement was lower during moisture changing process compared to those measured at similar moisture content in a stable state. These results suggested that wood in an unstable state showed lower elasticity and strength and higher fluidity than wood in a true equilibrium state. Furthermore, the anisotropy in vibrational properties was found to vary between two species.
Keywords: Mechanical properties, elasticity, red oak, maple, moisture, vibration, modulus of elasticity, bending, Acer, Quercus rubra, flexure, wood moisture, anisotropy, adsorption, orientation, nondestructive testing, bending strength, wood strength, moisture content, vibration tests, stiffness, desorption, fiber orientation
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Jiang, Jiali; Cai, Zhiyong; Lu, Jianxiong; 2009. Effect of moisture sorption state on vibrational properties of wood. In: Proceedings of the 16th International Symposium on Nondestructive Testing and Evaluation of Wood, October 12-14, 2009, Beijing, China. Beijing, China : Beijing Forestry University, c2009: p. 177-183.
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