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Master's Dissertation
DOI
10.11606/D.18.2011.tde-13052011-094757
Document
Author
Full name
Yuri Andrey Olivato Assagra
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2011
Supervisor
Committee
Altafim, Ruy Alberto Corrêa (President)
Lahr, Francisco Antonio Rocco
Ribeiro, Cacilda de Jesus
Title in Portuguese
Estudos mecânicos e elétricos em madeiras envoltas com manta geossintética e impregnadas com resina poliuretana
Keywords in Portuguese
Geotêxtil
Madeira
Resina poliuretana derivada do óleo de mamona
Abstract in Portuguese
Nas redes de distribuição de energia, as cruzetas sofrem uma exposição direta a intempéries, particularmente à ação da umidade, o que acelera seu processo de degradação. A higroscopicidade da madeira facilita a absorção de água, com significativa perda de suas características mecânicas e elétricas. Para minorar os problemas relacionados a absorção de umidade foi desenvolvido um novo processo de revestimento e impregnação da madeira e, neste trabalho, é apresentada uma investigação das características mecânicas e elétricas desse novo compósito. Para tanto, ensaios mecânicos de flexão estática foram executados em três materiais: na madeiras em estado natural (sem tratamento), na madeira resinada e no novo compósito; e, com intuito de estudar as características elétricas, ensaios de resistividade superficial e volumétrica foram realizados em amostras secas e molhadas. Também fez parte deste estudo o desenvolvimento de uma prensa mecânica para duas toneladas, cujo programa computacional pode ser facilmente adaptado para outras cargas.
Title in English
Mechanical and electrical analysis of wood wrapped in geosynthetic blanket impregnated with polyurethane resin
Keywords in English
Geotextile
Polyurethane resin derived from castor oil
Wood
Abstract in English
In the electrical distribution system, the crossarms suffer direct exposure to weather conditions especially humidity, which can accelerates the degradation process. The hygroscopicity of wood facilitates the absorption of water, with significant loss of its mechanical and electrical characteristics. To reduce the problems listed above; we develop a new process of coating and impregnation of wood. Thus, we present in this work several studies on mechanical and electrical properties of these new composite. With this in mind, bending mechanical tests were performed in three materials: wood in natural state (no treatment), resin-impregnated wood also on the new composite. In addition, to study the electrical characteristics, tests of surface and volume resistivity were carried out in dry and wet samples. Furthermore, a two-ton mechanical press (whose computer program can be easily adapted for other tonnages) development was part of this work.
 
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Yuri.pdf (2.04 Mbytes)
Publishing Date
2011-05-20
 
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