Modulus of Elasticity of &lt;i&gt;Schizolobium amazonicum &lt;/i&gt;Wood Evaluated by Transversal Vibration Technique

Almeida, Diego Henrique de; Cavalheiro, Raquel Schmitt; Ferro, Fabiane Salles; Almeida, Tiago Hendrigo de; Christofóro, André Luis; Calil, Carlito; Lahr, Francisco Antônio Rocco

doi:10.4028/www.scientific.net/amr.912-914.247

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Hence, the use of non-destructive acoustic methods (NDAT) is needed. There exist several non-destructive acoustic methods for estimating elasticity of wood based on ultrasound (Wang et al 2003), stress waves, infrared spectroscopy (Bailleres et al 2005), and vibration method (Barrett and Hong 2010;Almeida et al 2014;Guan et al 2019;Olaoye and Okon-Akan 2020). After analyzing anatomical, physical, and mechanical properties of plantation wood, this study considers four strains of clone plantation C. lanceolata timber in Kaihua County, Zhejiang Province as the research object.…”

Section: Introductionmentioning

confidence: 99%

Anatomical, physical, and mechanical parameters of clone plantation tree, Cunninghamia lanceolata

Song

et al. 2021

BioRes

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Anatomical characteristics of the plantation tree, Cunninghamia lanceolata were studied. Clonal variability and intra-tree variation, as well as its possibilities of application to the wood industry were analyzed for four clones. Tracheid length from the first to 17th annual ring within clones increased rapidly at first, and then plateaued. The maximum value appeared at the 14th annual ring of clone IV (3795 μm), and the minimum value appeared at the 1st annual ring of clone I (849 μm). Tracheid width and tracheid double wall thickness increased first and then tended to be flat or slightly decreased; tracheid length to width ratio showed an overall increasing trend; the variation of tracheid double wall thickness was not significant. Between clones, the variation coefficient of tracheid width, double wall thickness, and wall to cavity ratio were large. The tissue proportion within clones from large to small was the following: tracheid proportion > wood ray proportion > parenchyma proportion, and there was no significant difference between clones. The basic density within clones showed a gradual increase but a certain fluctuation; the difference between clones was not significant. The maximum crystallinity appeared in clone II (sapwood 55.1%, heartwood 51.2%), and the difference between clones was not significant.

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Section: Introductionmentioning

confidence: 99%

Anatomical, physical, and mechanical parameters of clone plantation tree, Cunninghamia lanceolata

Song

et al. 2021

BioRes

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

Christofóro

Lahr²,

Valarelli

et al. 2015

AMR

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This research aimed to present an alternative methodology to determine the tensile modulus of elasticity based on the least squares method, allowing multiple uses of load and displacements values obtained from the experiment, giving greater reliability in the calculation of timber stiffness. Were used twelve specimens of Eucalyptus grandis wood species, tested in tensile parallel to the grain according to the assumptions of the Brazilian standard ABNT NBR 7190:1997. The modulus of elasticity obtained from the proposed calculation approaches were compared with the elastic moduli obtained from Brazilian standard recommendations. Results of analyzes of variance (Kruskal-Wallis) showed statistical equivalence between the modulus of elasticity obtained for both forms of calculation. However, considering the non-homogeneity of wood, to generalize the conclusions, it is necessary new set tests involving all strength classes indicate by NBR 7190:1997.

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Influence of the Number of Load Cycles to Obtain the Stiffness Properties of Angico Preto (<i>Anadenanthera macrocarpa</i>) Wood Specie

Chahud

Branco

Lahr

et al. 2015

AMR

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The tests used to obtain the stiffness properties of wood are made with two loading cycles, as defined by the Brazilian standard ABNT NBR 7190 (Design of Timber Structures). However, the possibility of reducing the number of cycles allows decrease the operating time of the machine, resulting in reduced spending on electricity used during the tests. This research aimed to investigate, with the aid of the analysis of variance (ANOVA), the influence of the use of three load cycles to obtain the modulus of elasticity in compression parallel to grain (Ec0), in tensile parallel to the grain (Et0), in bending (Em) and in compression perpendicular to the grain (Ec90) of Angico Preto (Anadenanthera macrocarpa) wood specie. For the number of cycles and stiffness were manufactured 12 samples, totaling 144 specimens. The results of the ANOVA revealed statistical equivalence between the stiffness properties for both load cycle numbers evaluated, indicating that it is possible to carry out the tests with a single charge cycle, allowing savings in time and energy in the operation of the equipment.

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Modulus of Elasticity of <i>Schizolobium amazonicum </i>Wood Evaluated by Transversal Vibration Technique

Cited by 5 publications

References 7 publications

Anatomical, physical, and mechanical parameters of clone plantation tree, Cunninghamia lanceolata

Anatomical, physical, and mechanical parameters of clone plantation tree, Cunninghamia lanceolata

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

Influence of the Number of Load Cycles to Obtain the Stiffness Properties of Angico Preto (<i>Anadenanthera macrocarpa</i>) Wood Specie

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