Evaluation of density, compression and flexure strngth based on Jaka hardness test of eucaliptus


Eucalyptus presents heterogeneity of physical-mechanical characteristics and has difficulty anatomical identification. This paper analyses the viability of Janka hardness (considered a no-destructive test) as an estimator of density, compression strength and modulus of rupture. The 43 eucalyptus logs were analysed using a exponential function (linearized through the natural logarithm) for Janka hardness and depend variables. It was observed that the dispersions around the regression curves increase, but on the transformed scale these dispersions are constant. The regression analysis results showed that there is a correlation of apparent density at 15% of moisture content, flexural strength and green state compression with the Janka hardness on green wood. Eucalyptus presented regression curve with a coefficient of determination between 0.80 and 0.84, with dispersion between 6% and 10%. It was conclude that the Janka hardness property can be used as density estimator and resistance to flexion and compression.

YOJO, Takashi; SOUZA, Cassiano Oliveira de; MIRANDA, Maria José de Andrade Casimiro; BRAZOLIN, Sérgio. Dureza Janka como estimador da densidade aparente e das resistências à flexão e compressão em eucalipto. In: ENCONTRO BRASILEIRO MEM MADEIRAS EM ESTRUTURAS DE MADEIRA, EBRAMEM, 16.; CONGRESSO LATINO-AMERICANO DE ESTRUTURAS DE MADEIRAS, 3., 2018, São Carlos. Anais… São Carlos: USP/EEESC; IBRAMEM, 2018. 9 p.

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