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Title: Effect of Moisture Sorption State on Vibrational Properties of Wood

Source: In: Proceedings of the international symposium on nondestructive testing and evaluation of wood. 2009 October 12-14. Beijing, China. Beijing, China: Beijing Forestry University. 177-183; 2009

Author(s)Jiang, Jiali; Cai, Zhiyong; Lu, Jianxiong

Publication Year: 2009  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4706-2A

Abstract: 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

Publication Review Process: Non-Refereed (Other)

File size: 214 kb(s)

Date posted: 05/02/2011
RITS Product ID: 36666
Current FPL Scientist associated with this product
Cai, Zhiyong
Supervisory Research Materials Engineer
  

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