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

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.

Changing the calculated surface area of wood samples to define drying schedules for Eucalyptus clones

“…Besides that, some intrinsic characteristics, such as lower percentage area occupied by vessels in the transversal surface of a given wood, can increase its mechanical strength to the tensions that causes end checks (Soares et al 2021). Thus, the material can be less susceptible to this type of defect and endure more severe drying at higher initial and final temperatures, besides higher drying potentials, without checking in larger proportions.…”