Relationship between vessel parameters and cleavage associated with checking in Eucalyptus grandis wood

José Reinaldo Moreira Da Silva,José Tarcísio Lima,Bruno Charles Dias Soares

doi:10.4067/s0718-221x2021000100443

José Reinaldo Moreira Da Silva, José Tarcísio Lima + Show 1 more

Open Access

https://doi.org/10.4067/s0718-221x2021000100443

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Abstract

In this work, the relationship between vessels parameters and the wood cleavage strength were studied to clarify the process of formation of this type of check, very common in Eucalyptus wood. The objective was to identify the relationship between the wood cleavage strength, the average area of the vessel, and the percentage area of vessels on the wood transverse surface. For this, two Eucalyptus grandis trees at 22 years old were felled and specimens for the cleavage test were produced to determine the wood cleavage strength. From these specimens, samples were taken to determine the average area of the vessel and the percentage area of vessels, aiming at adjusting mathematical models that explain the variation in the cleavage strength. The results showed that the higher the average area of the vessel and the percentage of area occupied by vessels in the wood, the lower its cleavage strength. The multiple linear regression model can estimate the cleavage strength as a function of the average area of the vessel, and the percentage area of the vessels

Highlights

As a sustainable alternative to the use of wood from Brazilian native species for the sawn timber industry, species of the genus Eucalyptus have been used
About the area of the vessel (AAV), the average of 12493 μm2 is higher than that found by Barotto et al (2017), of 9673 μm2, in wood of four E. grandis clones analyzed at 18 years of age
With regard to percentage area of vessels (PAV), the average of 18,7 % is higher than the average of 14,4 % found by Barotto et al (2017), indicating that the average area of the vessel tends to directly influence the percentage area of the vessels

Summary

Introduction

As a sustainable alternative to the use of wood from Brazilian native species for the sawn timber industry, species of the genus Eucalyptus have been used. This wood is prone to defects caused by the release of growth stress and the stresses generated during the drying process. The existence of the vessels characterize wood as a porous material, the fiber cell wall being responsible for the mechanical strength of the trunk. The stresses applied to the wood dissipate through the cell walls, which in turn can deform elastically, plastically, or undergo fracture, depending on their mechanical strength and the type and the degree of applied stress

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