PHYSICAL AND MECHANICAL PROPERTIES OF SOME CHILEAN SOFTWOODS AND HARDWOODS USING ULTRASOUND

Erik Baradit, Peter Niemz, Arturo Fernández-Pérez

Abstract


The non-destructive techniques are a very important tool in the process of wood characterization andevaluation. In this work, the objective is the evaluation of physical and mechanical properties of somenative Chilean wood species by using the ultrasound techniques and their comparision with the resultsof typical mechanical tests. The selected woods were four hardwoods: tepa (Laureliopsis philipiana),olivillo (Aextoxicon punctatum), laurel (Laurelia sempervirens) and lenga (Nothofagus pumilio) andtwo softwoods: alerce (Fitzroya cupressoides) and mañío (Podocarpus nubigena). The equipment usedwere two types of ultrasound generators: Steinkamp BP5 and Panametric Epoch XT. The results showna higher anisotropy for hardwoods than for softwoods, and a relatively symmetry for transversal wavepropagation velocities and for shear modulus of elasticity, along the principal directions of the tree. Atthe same time the mean values of Young modulus of elasticity (MOE) obtained by using the ultrasoundequipments were a 25-47 % higher than the same modulus measured by mechanical tests.

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