PHYSICAL-MECHANICAL CHARACTERIZATION OF Eucalyptus urophylla WOOD

Abstract

ABSTRACT:Eucalyptus urophylla consists in a wood-producing species, which offers a natural multiple raw material of good quality for applications in rural and civil constructions. However, Eucalyptus urophylla still has a small utilization as building parts and elements, resulting from the possible ignorance and low diffusion of its structural possibilities. Thereby, the present research aims to measure the main thirteen mechanical properties of Eucalyptus urophylla wood for two different moisture contents, 12% and 30% (green wood). Furthermore, in these two conditions of moisture content evaluation, volumetric mass densities were also evaluated. At the end of this evaluation, which included 2688 determinations, all the obtained results were statistically treated with t-test at a 5% of significance level in order to evaluate the influence of moisture content in the evaluated properties. Twelve mechanical properties were significantly affected by moisture content, and the behavior pattern consisted in increasing the values of the properties with the reduction of the moisture content.

Sixteen properties of Eucalyptus Tereticornis wood for structural uses

“…Comparing these results to ones found to Eucalyptus umbra (NOGUEIRA et al, 2018a), Eucalyptus camaldulensis (NOGUEIRA et al, 2018b), Eucalyptus maidenii (NOGUEIRA et al, 2018c), and Eucalyptus urophylla (LAHR et al, 2017), the Eucalyptus tereticornis timber is efficient from the structural point of view (Tables 3 to 5), being interesting for heavy and light buildings and rural uses due to result similarities. In addition, this study reinforced that tereticornis species could be useful in these purposes, testifying Gutiérrez (1976) and Boland et al (2006) similar affirmations from their eucalypt "encyclopedic studies", despite their non-specification of any numerical value for Eucalyptus tereticornis mechanical properties.…”

“…All samples were tested in both moisture contents (30 and 12%), together with a universal testing machine. This research inquired the influence of these two moisture contents for two physical and fourteen mechanical properties, comparing their progresses by means of testing of Eucalyptus tereticornis wood, such as were followed by Lahr et al (2017) and Nogueira et al (2018a,b,c). In total, 1091 repeats were performed.…”

“…Due to the consideration of sampling independence, randomization of sampling process, and the normality admission, the t-test was utilized to verify statistical differences among results at both moisture conditions of 30 and 12%, similarly to those analyses from Lahr et al (2017) and Nogueira et al (2018a,b,c). For this, statistical hypotheses of interest were established, where in the first condition (H0: µ1 = µ2) there is no statistical differences, and in the second one (H1: µ1 ≠ µ2) these means do differ.…”

Characterization of Eucalyptus maidenii Timber for Structural Application: Physical and Mechanical Properties at Two Moisture Conditions

“…Similarly to Lahr et al [28] and Nogueira et al [29] studies, the samples used in these sixteen tests were prepared and conditioned for stabilization in both moistures at green (30%) and standard point (12%) in the Laboratory of Wood and Timber Structures (LaMEM) at the School of Engineering of São Carlos from the University of São Paulo (USP-EESC), São Carlos, Brazil. Furthermore, 310 determinations (or repetitions) were carried out in the aforementioned sixteen physical-mechanical parameters for the evaluation of Eucalyptus maidenii.…”

Physical and mechanical properties of Eucalyptus saligna wood for timber structures

“…For timber building structures, the knowledge of physical and mechanical properties of wood are very important, for its rational use (CALIL JUNIOR;DIAS, 2003;CALIL JUNIOR;MOLINA, 2010;ANDRADE JUNIOR et al, 2014;LAHR et al, 2017a). The very purpose of wood characterization is to evaluate its possible use as a structural member (VIVIAN et al, 2010;GUO, 2016GUO, , 2017LAHR et al, 2017b). For this purpose, Brazilian Standard Code NBR 7190 (Associação Brasileira de Normas Técnicas (ABNT, 1997) presents all experimental procedures for the conduction of the testing of the specimens.…”