Consulta: subjectFacets:"Modulus of elasticity"
Registros recuperados: 8
Data/hora: 07/06/2024 09:44:10

The position effect of structural Eucalyptus round timber on the flexural modulus of elasticity
Provedor de dados: 70
Autores: Christoforo,André L; Panzera,Túlio H; Batista,Fabiano B; Borges,Paulo H. R; Lahr,Francisco A. R; Franco,Claudenir F.
Round timber has great use in civil construction, performing the function of beams, columns, foundations, poles for power distribution among others, with the advantage of not being processed, such as lumber. The structural design of round timber requires determining the elastic properties, mainly the modulus of elasticity. The Brazilian standards responsible for the stiffness and strength determination of round timber are in effect for over twenty years with no technical review. Round timber, for generally present an axis with non-zero curvature according to the position of the element in the bending test, may exhibit different values of modulus of elasticity. This study aims to analyze the position effect of Eucalyptus grandis round timber on the flexural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Round timber; Bending of beams; Modulus of elasticity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600019

Mechanical properties of grain in silos for simulation designs
Provedor de dados: 70
Autores: Lopes Neto,José P.; Nascimento,José W. B. do; Marques,Jordânio I.; Costa,Carlos A. da.
ABSTRACT For the calculation of silos structures it has been used new methods and computational tools that require mechanical properties knowledge that are still unknown for most storable materials, especially grains. In this context, we aimed to determine the mechanical properties of rice and beans grains with moisture contents of 10, 12, and 14% by applying four compressive loads (5, 10, 15 and 20). The determined mechanical properties were Poisson's ratio (ν), Modulus of Elasticity (E), and the dilatancy angle (ψ). The procedure consisted in the application of the load in compression cell, adapted from MOLENDA &amp; STASIAK, aiming to simulate loading and unloading of silos. We observed that the Poisson's ratio calculated for both loading and unloading,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poisson’s coefficient; Compression; Modulus of elasticity; Silos; Simulation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400573

Alternative methodology for calculating the modulus of elasticity of wooden beams of structural dimensions
Provedor de dados: 70
Autores: Christoforo,André L.; Panzera,Tulio H.; Neto Junior,Carlito Calil; Demarzo,Mauro A.; Ribeiro Filho,Sérgio L. M.; Toniolo,Luiz E.; Amstalden,Rogério A. S.; Lahr,Francisco A. R.
This study aims to present an alternative calculation methodology based on the Least Squares Method for determining the modulus of elasticity in bending wooden beams of structural dimensions. The equations developed require knowledge of three or five points measured in displacements along the piece, allowing greater reliability on the response variable, using the statistical bending test at three points and non-destructively, resulting from imposition of measures from small displacements L/300 and L/200, the largest being stipulated by the Brazilian norm NBR 7190:1997. The woods tested were Angico, Cumaru, Garapa and Jatoba. Besides obtaining the modulus of elasticity through the alternative methodology proposed, these were also obtained employing the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wood; Beam theory; Modulus of elasticity; Least Squares Method.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100016

ANALYSIS OF ELASTICITY IN WOODS SUBMITTED TO THE STATIC BENDING TEST USING THE PARTICLE IMAGE VELOCIMETRY (PIV) TECHNIQUE
Provedor de dados: 70
Autores: Pereira,Rodrigo A.; Gomes,Francisco C.; Braga Júnior,Roberto A.; Rivera,Fernando P.
ABSTRACT The most important parameter in terms of material mechanical behavior knowledge is the modulus of elasticity, being traditionally obtained through destructive tests. The objective of this study is the verification of the potential use of the particle image velocimetry technique (PIV) as a tool to obtain the modulus of elasticity in sawed wood samples (Pinus oocarpa and Eucaliptus grandis) and wood panels (Plywood, LVL and OSB). The PIV technique has as characteristics the low cost of equipment, fast results, no need for contact with the object tested, accuracy and possibility of application in the field. The application of the PIV technique occurred during the static bending tests where the deformations were also measured with a dial indicator...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characterization; Nondestructive testing; Modulus of elasticity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000200159

ESTIMATION OF WOOD TOUGHNESS IN BRAZILIAN TROPICAL TREE SPECIES
Provedor de dados: 70
Autores: Christoforo,André L.; Almeida,Diego H. de; Varanda,Luciano D.; Panzera,Tulio H.; Lahr,Francisco A. R.
ABSTRACT Wood has been used for several purposes such as in civil and rural construction. Knowing wood mechanical behavior under short-term loading is essential for safer structural designs. However, wood toughness is a mechanical property little investigated for this purpose. Thus, this study aimed to evaluate, using exponential and polynomial regression models (linear, quadratic, and cubic), the possibility of estimating toughness as a function of apparent density, compression parallel to grain strength, and modulus of rupture in static bending. Thirty-six Brazilian tropical wood species from south of Roraima, Mato Grosso do Sul, and north and northeast of Mato Grosso were tested. Our results showed the significance and representativeness of all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apparent density; Tropical wood species; Modulus of elasticity; Compression parallel to grain strength; Toughness.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000200232

Estimativa da resistência e rigidez da madeira de Eucalyptus grandis por meio de onda ultrassonora
Provedor de dados: 190
Autores: Vivian, Magnos Alan; Santini, Elio José; Modes, Karina Soares; Carvalho, Douglas Edson; Morais, Weslley Wilker Corrêa; Souza, Joel Telles de; Susin, Felipe.
O presente estudo objetivou avaliar o uso da constante elástica dinâmica obtida no ensaio não destrutivo, como parâmetro para estimativa das propriedades mecânicas de rigidez e resistência da madeira de Eucalyptus grandis. Para isto, utilizou-se um emissor de ondas ultrassônicas, o qual teve sua sensibilidade avaliada através da comparação com os valores obtidos no ensaio destrutivo de flexão estática. Os resultados evidenciam que a constante elástica dinâmica pode ser utilizada para inferência não destrutiva da rigidez e resistência da madeira de Eucalyptus grandis, entretanto com ressalvas, pois os ajustes observados foram relativamente baixos, com R²aj. de 0,25 e 0,39, respectivamente. doi: 10.4336/2012.pfb.32.69.109
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ensaio não destrutivo; Módulo de elasticidade; Módulo de ruptura Non-destructive testing; Modulus of elasticity; Modulus of rupture.
Ano: 2012
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/272

Mechanical properties of the rachis from macaw palm bunche
Provedor de dados: 1
Autores: Oliveira, Zenil Ricardo Cunha Rodrigues de; Santos, Fábio Lúcio; Valente, Domingos Sarvio Magalhães; Pinto, Francisco de Assis de Carvalho; Velloso, Nara Silveira.
 Numerical implementation methods such as the finite element method can be used in machine design to study the dynamic behavior of the plant. Input parameters for using the finite element method should be set based on the geometrical, physical and mechanical system under study. Thus, the aim of this study was to determine the mechanical properties of the rachis of macaw palm in the green maturation stage at an age of 180 days and at fruit maturation. The water content was calculated using the oven method of 105 ± 3°C for 24 hours. The modulus of elasticity for the rachis was determined by means of mechanical compression testing. The Poisson's ratios were determined from the results of the longitudinal and transverse deformation of rachis test bodies. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acrocomia aculeate; Modulus of elasticity; Poisson's ratio; Shear test.; Engenharia de Processamento de Produtos Agrícolas.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39504

Mechanical properties of the rachis from macaw palm bunche
Provedor de dados: 1
Autores: Oliveira, Zenil Ricardo Cunha Rodrigues de; Santos, Fábio Lúcio; Valente, Domingos Sarvio Magalhães; Pinto, Francisco de Assis de Carvalho; Velloso, Nara Silveira.
 Numerical implementation methods such as the finite element method can be used in machine design to study the dynamic behavior of the plant. Input parameters for using the finite element method should be set based on the geometrical, physical and mechanical system under study. Thus, the aim of this study was to determine the mechanical properties of the rachis of macaw palm in the green maturation stage at an age of 180 days and at fruit maturation. The water content was calculated using the oven method of 105 ± 3°C for 24 hours. The modulus of elasticity for the rachis was determined by means of mechanical compression testing. The Poisson's ratios were determined from the results of the longitudinal and transverse deformation of rachis test bodies. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.03.00.00-8; 50303007 Acrocomia aculeate; Modulus of elasticity; Poisson's ratio; Shear test. Engenharia de Processamento de Produtos Agrícolas.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39504