Abstract

SOTOMAYOR CASTELLANOS, Javier Ramón  and  VILLASENOR AGUILAR, José María. Dynamic modulus assessment by stress waves in Acer saccharum Marshall and Thuja plicata L. wood. Ing. Desarro. [online]. 2017, vol.35, n.2, pp.402-416. ISSN 0122-3461.

The research goal was to assess the stress wave speed in the longitudi nal and radial directions of Acer saccharum Marshall and Thuja plicata L. wood, and weighting this parameter with the wood density, to determine the dynamic modulus of elasticity. For each species, 32 ad-doc wood specimens were prepared with an average moisture content of 11 % in which stress waves tests were realized. The experimental design consisted in normality and difference of means tests. The res ponse variables were the wood density, and for the longitudinal and tangential directions, the speed of the stress waves and the dynamic modulus. The wood species was considered the variation factor. The stress waves method allowed the dynamic characterization of A. sac charum and T. plicata wood. Significant statistical difference was found between the response variables. The density of A. saccharum wood is greater than the corresponding to T. plicata wood. In the longitudinal direction, the stress wave speed and dynamic modulus of A. saccharum wood are lower than the T. plicata ones. In the tangential direction, the stress wave speed of A. saccharum is bigger than the T. plicata wood. In contrast, the dynamic modulus is smaller. When compared to the tangential direction, the stress wave speed and dynamic modulus are bigger in the longitudinal direction for both species.

Keywords : Dynamic characterization; nondestructive tests; wood anisotropy; wood density.

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