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Doctoral Thesis
DOI
10.11606/T.18.2012.tde-10042012-105723
Document
Author
Full name
Marcelo Rodrigo Carreira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2012
Supervisor
Committee
Dias, Antonio Alves (President)
Ballarin, Adriano Wagner
Lahr, Francisco Antonio Rocco
Sales, Almir
Varoto, Paulo Sergio
Title in Portuguese
Avaliação da rigidez à flexão de toras de madeira por meio de vibração transversal
Keywords in Portuguese
Avaliação não-destrutiva
Ensaio dinâmico
Rigidez à flexão
Toras de madeira
Vibração transversal
Abstract in Portuguese
Antes de utilizar as toras de madeira como elemento estrutural é necessário avaliar as propriedades mecânicas desse material tanto por inspeção visual quanto por ensaio mecânico. A técnica de vibração transversal tem se destacado entre os demais métodos de Avaliação Não-Destrutiva para madeira serrada por obter estimativas acuradas do módulo de elasticidade à flexão. Contudo, testes prévios com essa técnica evidenciaram dificuldades de empregá-la na avaliação a rigidez à flexão de toras. O objetivo deste trabalho foi propor um método de ensaio para estimar o módulo de elasticidade na flexão de toras de madeira por meio de vibração transversal. O método proposto foi testado e validado em uma amostra de 40 toras de Eucalyptus sp. Foram obtidas boas correlações entre o módulo de elasticidade estático e o módulo de elasticidade dinâmico obtido pelo ensaio de vibração transversal.
Title in English
Evaluation of bending stiffness of wood logs by means of transverse vibration
Keywords in English
Bending stiffness
Dynamic test
Non-destructive evaluation
Transverse vibration
Wood logs
Abstract in English
Before using the wood logs as a structural element is necessary to evaluate the mechanical properties of this material by visual inspection and mechanical testing. The transverse vibration technique has stood out among the other methods of Non-Destructive Evaluation for lumber to obtain accurate estimates of the bending modulus of elasticity. However, previous tests showed difficulties with this technique to use it to evaluate the bending stiffness of logs. The aim of this work is to propose a test method to estimate the bending modulus of elasticity of wood logs by means of transverse vibration. The proposed method was tested and validated on a sample of 40 logs of Eucalyptus sp. It was obtained good correlation between the static bending and dynamic modulus of elasticity obtained by transverse vibration test.
 
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Publishing Date
2012-04-18
 
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