ELASTIC CONSTANTS OF SOME NATIVE CHILEAN WOOD SPECIES USING ULTRASOUND TECHNIQUES

摘要

The aim of this work is to determine the Young's modules and shear modules of elasticity of four native Chilean hardwoods (Tepa (Laureliopsis philipiand), Olivillo (Aextoxicon punctatuni), Laurel (Laurelia sempervirens) and Lenga (Nothofagus pumilio)and two Chilean softwoods (Alerce (Fitzroya cupressoides) and Manio (Podocarpus nubigendj) using ultrasound techniques. Longitudinal and transversal waves were used to determine the three MOE in the longitudinal, radial and transversal directions and also the shear modules G_(LR), G_(lt)and G_(rt) The results show higher anisotropy behavior for the tested hardwoods in relation to softwoods. This is in contrast to most European species, which have a higher anisotropy for softwood than for hardwood.