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| 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 & 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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