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Master's Dissertation
DOI
10.11606/D.88.2002.tde-23042007-085046
Document
Author
Full name
Elen Aparecida Martines Morales
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2002
Supervisor
Committee
Lahr, Francisco Antonio Rocco (President)
Goncalves, Marcos Tadeu Tiburcio
Govone, José Silvio
Title in Portuguese
Determinação do módulo de elasticidade da madeira: proposta para simplificação de procedimentos metodológicos
Keywords in Portuguese
Ciclos de carregamento
Madeira
Módulos de elasticidade
Resistência
Rigidez
Abstract in Portuguese
O texto normativo NBR 7190/1997, da Associação Brasileira de Normas Técnicas (ABNT), adota três ciclos de carregamento nos ensaios para a determinação de propriedades de rigidez e resistência da madeira. A partir das recomendações de tal documento foram realizados ensaios de compressão normal às fibras, compressão paralela às fibras, flexão estática e tração paralela às fibras com corpos-de-prova de Cambará Rosa (Erisma sp), Eucalipto Grandis (Eucalyptus grandis), Envira (Xylopia sp), Champanhe (Dipteryx odorata), Pinus Caribaea (Pinus caribaea var. caribaea), Pinus Elliottii (Pinus elliottii var. elliottii) e Pinus Hondurensis (Pinus caribaea var. hondurensis). Os valores dos módulos de elasticidade (E) obtidos mostraram-se estatisticamente equivalentes no segundo e terceiro ciclos de carregamento. Esta análise sugere, então, que o terceiro ciclo de carregamento é desnecessário. Foram comparados, também, os valores dos módulos de elasticidade de trinta e quatro espécies de madeiras tropicais brasileiras, obtidos nos ensaios de compressão paralela às fibras, tração paralela às fibras e flexão estática. Concluiu-se que estes são estatisticamente equivalentes.
Title in English
Wood modulus of elasticity determination: proposal to simplification of methodological procedures
Keywords in English
Loading cycles
Modulus of elasticity
Stiffness
Strength
Wood
Abstract in English
The NBR 7190/1997, adopted by of Brazilian Technical Standard Association (ABNT), indicates three loading cycles for tests to determine wood stiffness and strength. Based on recommendations of ABNT methods tests were carried out in compression perpendicular to grain, compression parallel to grain, static bending and tension parallel to grain, with Cambará Rosa (Erisma sp), Eucalipto Grandis (Eucalyptus grandis), Envira (Xylopia sp), Champanhe (Dipteryx odorata), Pinus Caribaea (Pinus caribaea var. caribaea), Pinus Elliottii (Pinus elliottii var. elliottii) and Pinus Hondurensis (Pinus caribaea var. hondurensis) species. Modulus of elasticity values (E) obtained were statistically equivalent in second and third loading cycles. This analysis suggests that the third loading cycle is not necessary. Modulus of elasticity values of thirty four Brazilian tropical wood species were compared in compression parallel to grain, tension parallel to grain and static bending. The analysis showed that these values are statistically equivalent.
 
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dissertacao.pdf (730.87 Kbytes)
Publishing Date
2007-05-28
 
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