• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
10.11606/T.18.2018.tde-18052018-202939
Document
Author
Full name
Alcebíades Negrão Macêdo
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2000
Supervisor
Committee
Calil Junior, Carlito (President)
Ballarin, Adriano Wagner
Dias, Antonio Alves
Proença, Sergio Persival Baroncini
Rodrigues Junior, Manoel Santinho
Title in Portuguese
Fadiga em emendas dentadas em madeira laminada colada
Keywords in Portuguese
Emendas dentadas
Fadiga
Madeira laminada colada
Abstract in Portuguese
O objetivo deste trabalho é o estudo da resistência e rigidez das emendas dentadas à fadiga na tração com as finalidades de propor uma metodologia de ensaio e estimar um coeficiente redução da resistência à fadiga na tração das emendas dentadas em relação a madeira maciça, contribuindo para a caracterização destas ligações. Foram utilizadas duas espécies de madeira, Pinus caribea hondurensis e Eucalyptus grandis, e dois tipos de adesivos sendo um industrial à base de fenol-resorcinol e um poliuretano à base de resina de mamona desenvolvido no Instituto de Química de São Carlos. Foram realizados ensaios cíclicos para três níveis de freqüência (1 Hz, 5 Hz e 9 Hz) e três níveis de tensão (90%, 75% e 60% da resistência) a uma relação R = 0,1. Com base nos resultados foram propostos coeficientes de redução de resistência à fadiga da emenda dentada em relação à madeira maciça e verificar que não há variação significativa da rigidez em função do número de ciclos.
Title in English
not available
Keywords in English
Fatigue
Finger joints
Glulam
Abstract in English
The aims of this work is the study of the fatigue strength and stiffness of the finger joints in tension, in order to propose an experimental methodology and to determine a strength reduction coefficient, in relation to solid wood, contributing to the characterization of these joints. Two wood species, Pinus caribea hondurensis and Eucalyptus grandis, and two adhesives types were used, being an industrial one phenol-resorcinol based and a poliuretane castor oil resin based, developed at the lnstitute of Chemistry of São Carlos. Cyclical tests were accomplished in three frequency levels (1 Hz, 5 Hz and 9 Hz) and three tension levels (90%, 75% and 60% of the strength) to a relationship R = 0,1. Based on the results, it were proposed strength reduction coefficients in relation to solid wood, for finger joints under fatigue in tension, and to concluded that there is no significant variation in stiffness with the cycle numbers.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2018-05-18
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2020. All rights reserved.