Evaluation of the Tensile Modulus of Elasticity in Parallel Direction to the Grain for &lt;i&gt;Eucalyptus grandis&lt;/i&gt; Wood Specie

Christofóro, André Luis; Lahr, Francisco Antônio Rocco; Valarelli, Ivaldo De Domênico; Battistelle, Rosane Aparecida Gomes; Branco, Luiz Antônio Melgaço Nunes; Chahud, Eduardo; Panzera, Túlio Hallak

doi:10.4028/www.scientific.net/amr.1088.599

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…The average values of the physical and mechanical properties obtained from this research in the respective moisture content are in accordance with the results of Santos et al (2003). Wiedenhoeft (2010), Cademartori et al (2012), Bal & Bektas (2013), Christoforo et al (2015), Lahr et al (2017) and also with the Brazilian standard ABNT NBR 7190 (1997). Table 3 shows that the basic density of wood was not affected by the moisture content, resulting in equivalent values, which is common in similar studies, such as the one developed by Wiedenhoeft (2010).…”

Section: Resultsmentioning

confidence: 99%

“…The wood of Eucalyptus grandis is light, fairly hard and easily workable. It has a straight fiber, easily cracks and has a light reddish color, being that its heartwood has dark reddish color and its sapwood presents light color and has susceptibility to Lyctus (Christoforo et al, 2015). It consists of a sawmill wood, with good planning, sanding, turning, drilling and finishing characteristics, however, it requires the use of appropriate debris techniques to minimize the effects of growth stresses.…”

Section: Introductionmentioning

confidence: 99%

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WOOD UTILIZATION OF Eucalyptus grandis IN STRUCTURAL ELEMENTS: DENSITIES AND MECHANICAL PROPERTIES

Lahr

Nogueira

Araújo³

et al. 2018

Eng. Agríc.

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Over the years, the species of eucalyptus has become a multipurpose raw material. In addition, the most relevant aspect of the use for various purposes is related to the production of a high quality wood, coming from short duration plantations, which is fundamental to the current demand of the industries. However, its use in civil construction has not yet reached a level of importance, due to the low knowledge of many of its resistance properties and the consequent popular fear in the use of reforestation woods, in particular the Eucalyptus grandis. This research investigated its main mechanical properties, aiming to reinforce its constructive applications in wood structures. For this, two physical properties and fourteen mechanical properties, in two different moisture conditions of the samples were evaluated, according to the norm NBR 7190 (1997). In the first moisture content, the samples were stabilized at 30%, while the second level considered the content of 12%. It was obtained 3580 determinations for the sixteen properties. From the 14 mechanical properties, only 7 had significant increases with the moisture reduction (30% to 12%), consisting of the rupture modulus in the parallel and normal compressions, normal traction and static bending; modulus of elasticity in normal compression and static bending and in shear strength.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

WOOD UTILIZATION OF Eucalyptus grandis IN STRUCTURAL ELEMENTS: DENSITIES AND MECHANICAL PROPERTIES

Lahr

Nogueira

Araújo³

et al. 2018

Eng. Agríc.

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show abstract

“…The modulus of elasticity to be calculated with the information from the testing model of Figure 2b is related to the idea of least squares (Equation 5) [6][7][8][9], aiming to determine the value of modulus of elasticity for the waste generated between the values of analytic (δ i (E)) and experimental (δ i ) displacements is minimized.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the Modulus of Elasticity in Damaged Wooden Beams

Christofóro¹,

Panzera²,

Silva³

et al. 2015

ijme

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This research aimed to employ two methods of calculation to obtain the bending modulus of elasticity in wooden specimens of Paricá (Shizolobium amazonicum), a simplified, adapted from the Brazilian standard ABNT NBR 7190, and another alternative based on the least squares method, in order to compare the efficiency of both. Therefore, some defects in wood specimens were created, based on the combination between the positions of the rips (damage) along the axis of the pieces (8.63, 17.25 and 25.86 cm) and their respective lengths (5, 10 and 15 mm), leading to a full factorial design of the type 3 2 , providing nine different combinations, apart from the reference condition (specimens without defects). The results of the confidence intervals revealed that the modulus of elasticity for both ways of calculation were equivalent for non-defective pieces, which did not occur with the inclusion of the defects in the specimens. In analysis of variance, the position, the length of the defects and the interaction between both proved to be not significant in the modulus of elasticity obtained from the methodology adapted from the Brazilian standard, which did not occur with the modulus of elasticity obtained from the least squares approach, proving to be more accurate than the simplified methodology, thus, emphasizing the importance of its use.

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“…The study of wood and its mechanical characterisation, as well as its engineered products [1][2][3], is of fundamental importance in order to achieve better use of this material together with those whose properties are widely known, regardless of the industrial segments involved [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Number of Load Cycles to Determine Some Wood Stiffness Properties

Morales¹,

Almeida²,

Christofóro³

et al. 2018

CJAST

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For fiber accommodation in tests to obtain wood strength and stiffness properties, some standards codes provide two or more load cycles, such as the Brazilian Standard ABNT NBR 7190, which establishes a number of three cycles (two previous and the final load cycle). However, reducing the number of load cycles provides savings in energy and manpower in the operation and maintenance of the testing machines, which motivates the development of research on this topic. This study

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Evaluation of the Tensile Modulus of Elasticity in Parallel Direction to the Grain for <i>Eucalyptus grandis</i> Wood Specie

Cited by 3 publications

References 5 publications

WOOD UTILIZATION OF Eucalyptus grandis IN STRUCTURAL ELEMENTS: DENSITIES AND MECHANICAL PROPERTIES

WOOD UTILIZATION OF Eucalyptus grandis IN STRUCTURAL ELEMENTS: DENSITIES AND MECHANICAL PROPERTIES

Evaluation of the Modulus of Elasticity in Damaged Wooden Beams

Evaluation of the Number of Load Cycles to Determine Some Wood Stiffness Properties

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