Abstract
The aim of this research is to study the ultrasonic waves birefringence in three wood-based composite panels, chipboards, oriented strandboards, and medium-density fiberboards, for the characterization of their global elastic and structural properties. Shear waves of 1 MHz were used to study the ultrasonic birefringence and to determine the shear terms of the stiffness matrix. As a complement for anisotropic behavior panel study, longitudinal waves of the same frequency were used to determine the corresponding terms of the stiffness matrix. Shear wave birefringence is the highest in the transversal anisotropic plane of the panels. Textural anisotropy was observed at the scale of the skin and core. Data related to the local characterization of the skin and core of the panels by x-ray microdensitometric technique revealed that, generally, the profile of the panel is symmetric and the skin density is higher than the core density. The nondestructive estimation of the birefringence of ultrasonic waves is a useful tool for further evaluation of panel performance related to their structural integrity and bond performance.
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