Influência do Comprimento de Corpos-de-prova na Obtenção do Módulo de Elasticidade Ec0

Bertolini, Marília da Silva; Silva, Diogo Aparecido Lopes; Souza, Amós Magalhães de; Neto, Carlito Calil; Lahr, Francisco Antônio Rocco

doi:10.4322/floram.2012.021

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…Researches with different positions, sizes and grain directions of the specimens were realizes to determine more information to mechanical and physical properties of the wood [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Shrinkage for Some Wood Species Estimated by Density

Christofóro¹,

Almeida²,

Almeida³

et al. 2016

ijme

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The knowledge about anisotropy of wood possibility more security design of structures and structural members designed. Therefore, there are little quantity of results knowledge about shrinkage and anisotropy coefficients of Wood species, motivating the development of new researches. The aim of research is evaluate the possibility of estimate the full shrinkage (radial; tangential; volumetric), anisotropy coefficient and shrinkage coefficient (radial; tangential; volumetric), using polynomial regression models (linear; quadratic; cubic) and exponential, by density of five Wood species (Cedro Doce [C20]; Canafístula [C30]; Angelim Araroba [C40]; Mandioqueira [C50]; Angelim Vermelho [C60]), properly classifieds in five strength classes for dicotyledonous according Brazilian Standard ABNT NBR 7190:1997. The better results were from tangential and volumetric retractions both using exponentials functions, justified by lower values of variation coefficients, with coefficients values of determination adjusted ranging from 51 and 54%. Even considered significant to the regressions for the tangential and volumetric shrinkage by analysis of variance, but with adjusted coefficients of determination lower than 70%, news researches should realized with other Wood species, enabling find general expressions for estimating such properties using the knowledge of the density.

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Section: Introductionmentioning

confidence: 99%

Shrinkage for Some Wood Species Estimated by Density

Christofóro¹,

Almeida²,

Almeida³

et al. 2016

ijme

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“…This material has the characteristic of being renewable and having a wide variety of properties between species that give it various applications. As wood is a heterogeneous material in terms of anatomical structure and chemical composition, the knowledge of its mechanical properties is fundamental and serves as a tool for understanding its quality, appropriate use, and the dimensions of structural parts (Bertolini et al, 2012;Lahr et al, 2017).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Effect of Sample Dimensions on Static Bending Test

et al. 2020

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This study aimed to evaluate the static bending strength (f M) and modulus of elasticity (MOE) to static bending values of Eucalyptus grandis samples produced in different dimensions. It intended to identify samples that present similar mechanical properties to those recommended by other technical standards and those obtained according to NBR 7190. The samples were made in agreement with the dimensions of the following standards: IPT, AFNOR B51-016, ASTM D143, CEN-EN 408, COPANT 555, and NBR 7190. The strength was significantly reduced with the increase of the sample dimensions. The MOE was significantly influenced by the samples size with the values showing a parabolic trend. The samples produced according to COPANT 555 (5 x 5 x 75 cm) presented resistance values similar to the values obtained following NBR 7190 specifications, whereas for the MOE, the samples proposed according to the IPT presented the closest values of Brazilian technical standards (NBR 7190).

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“…It was performed a study [13] to verify the influence of the length of wood specimens on the modulus of elasticity obtained in compression parallel to the grain (E c0 ). It were adopted 1:3, 1:4 and 1:5 ratios between the side of the cross section (50mm) and the length of the specimens (150, 200 and 250 mm).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Two Methods to Determine the Bending Modulus of Elasticity of Wood

Marini¹,

Christofóro²,

Lahr³

2018

ijme

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The modulus of elasticity is among the main properties required for the dimensioning of a wood structure. It can be calculated using different test methods, the most commonly used are the 3 and 4 points bending tests. The Brazilian standard, ABNT NBR 7190: 1997, recommends the 3-point static bending test. Studies about the influence of testing methods to determine the bending modulus of elasticity are always relevant, since can improve its reliability. Thus, the aim of this study is to examine the bending modulus of elasticity of samples of nine Brazilian wood species: Cambará Rosa (Erisma uncinatum Warm), Caxeta (Tabebuia cassinoides), Tatajuba (Bagassa guianensis), Itaúba (Mezilaurus itauba), Branquilho (Termilalia spp), Cedro Amazonense (Cedrelinga catenaeformis Ducke), Roxinho (Peltogyne spp.), Cumaru (Dipteryx odorata) and Cambará (Gochnatia polymorpha). The results of the confidence intervals have showed that the moduli of elasticity for both test methods were equivalent at 5% significance level.

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Influência do Comprimento de Corpos-de-prova na Obtenção do Módulo de Elasticidade Ec0

Cited by 8 publications

References 3 publications

Shrinkage for Some Wood Species Estimated by Density

Shrinkage for Some Wood Species Estimated by Density

Effect of Sample Dimensions on Static Bending Test

Comparison of Two Methods to Determine the Bending Modulus of Elasticity of Wood

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