EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência Florestal (Online) |
Texto Completo: | https://periodicos.ufsm.br/cienciaflorestal/article/view/26467 |
Resumo: | This study investigated the effect of thermal treatment, employed under two treatment conditions on mechanical properties of wood of Pinus taeda L. and Eucalyptus grandis W. Hill ex Maiden. From each species, three 25-year tress were sampled, and from each one, it was taken the first 2-meter long log, which was obtained from two boards of size 7,0 x 20,0 cm (thickness x width respectively) diametrically opposite from where 30 specimens were saw for each treatment. At the first one, called the combined one, the woods were subjected to heat treatment by autoclaving at 130 / ± 3°C and pressure of 2 kgf / cm ² for 3 hours and, after a conditioning period, subjected to heat in an electric oven at 160 / ± 1°C for the same period. The second treatment consisted only of heat treatment in oven. It was also evaluated the pieces of wood without treatment (control). The mechanical properties were evaluated by means of tests for determining the modulus of elasticity and rupture in bending, maximum resistance to compression parallel to the grain and Janka hardness according to ASTM D 143 (1995), and the impact resistance according to ABNT NBR 7190 (1997). For Pinus taeda wood, it was observed that treatment in an oven gave the worst outcomes, both due to the reduction in the values of supported load of a greater number of mechanical properties evaluated, but also as compared to the lowest increments in resistance when it was observed an increase to the same ones with heat treatment. In Eucalyptus grandis, the combined treatment decreased the greatest number of mechanical properties of wood. |
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EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODSEFEITO DA TERMORRETIFICAÇÃO NAS PROPRIEDADES MECÂNICAS DAS MADEIRAS DE Pinus taeda E Eucalyptus grandisheat treatmentmechanical propertiesPinusEucalyptusretificação térmicapropriedades mecânicasPinusEucalyptusThis study investigated the effect of thermal treatment, employed under two treatment conditions on mechanical properties of wood of Pinus taeda L. and Eucalyptus grandis W. Hill ex Maiden. From each species, three 25-year tress were sampled, and from each one, it was taken the first 2-meter long log, which was obtained from two boards of size 7,0 x 20,0 cm (thickness x width respectively) diametrically opposite from where 30 specimens were saw for each treatment. At the first one, called the combined one, the woods were subjected to heat treatment by autoclaving at 130 / ± 3°C and pressure of 2 kgf / cm ² for 3 hours and, after a conditioning period, subjected to heat in an electric oven at 160 / ± 1°C for the same period. The second treatment consisted only of heat treatment in oven. It was also evaluated the pieces of wood without treatment (control). The mechanical properties were evaluated by means of tests for determining the modulus of elasticity and rupture in bending, maximum resistance to compression parallel to the grain and Janka hardness according to ASTM D 143 (1995), and the impact resistance according to ABNT NBR 7190 (1997). For Pinus taeda wood, it was observed that treatment in an oven gave the worst outcomes, both due to the reduction in the values of supported load of a greater number of mechanical properties evaluated, but also as compared to the lowest increments in resistance when it was observed an increase to the same ones with heat treatment. In Eucalyptus grandis, the combined treatment decreased the greatest number of mechanical properties of wood.A presente pesquisa objetivou investigar o efeito da técnica de retificação térmica, empregada sob duas condições de tratamento, nas propriedades mecânicas das madeiras de Pinus taeda L. e Eucalyptus grandis W. Hill ex Maiden. De cada espécie foram amostradas três árvores com 25 anos e, de cada uma, retirada a primeira tora com 2 m de comprimento da qual foi obtida duas pranchas de dimensão 7,0 x 20,0 cm (espessura x largura, respectivamente) diametralmente opostas e destas confeccionados 30 corpos de prova para cada tratamento. No primeiro deles, denominado combinado, as madeiras foram submetidas à termorretificação em autoclave a 130/±3°C e pressão de 2 kgf/cm², por 3 horas e, após um período de condicionamento, submetidas ao calor em estufa elétrica a 160/±1°C, pelo mesmo período. O segundo tratamento consistiu apenas na termorretificação em estufa. Avaliaram-se ainda peças de madeira sem tratamento (testemunha). As propriedades mecânicas foram avaliadas por meio dos ensaios para determinação dos módulos de elasticidade e ruptura em flexão estática, resistência máxima à compressão paralela à grã e dureza Janka, conforme norma ASTM D 143 (1995), e resistência ao impacto, conforme norma ABNT NBR 7190 (1997). Para a madeira de Pinus taeda, observou-se que o tratamento em estufa forneceu os piores resultados, tanto em função da redução nos valores de carga suportada de um maior número de propriedades mecânicas avaliadas, como em relação aos menores incrementos na resistência quando observado um aumento das mesmas atribuídas ao tratamento térmico. Na madeira de Eucalyptus grandis, o tratamento combinado reduziu um maior número de propriedades mecânicas da madeira. Universidade Federal de Santa Maria2017-03-31info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsm.br/cienciaflorestal/article/view/2646710.5902/1980509826467Ciência Florestal; Vol. 27 No. 1 (2017); 291-302Ciência Florestal; v. 27 n. 1 (2017); 291-3021980-50980103-9954reponame:Ciência Florestal (Online)instname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMporhttps://periodicos.ufsm.br/cienciaflorestal/article/view/26467/pdf_1Copyright (c) 2017 Ciência Florestalinfo:eu-repo/semantics/openAccessModes, Karina SoaresSantini, Elio JoséVivian, Magnos AlanHaselein, Clovis Roberto2017-04-05T14:18:41Zoai:ojs.pkp.sfu.ca:article/26467Revistahttp://www.ufsm.br/cienciaflorestal/ONGhttps://old.scielo.br/oai/scielo-oai.php||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br1980-50980103-9954opendoar:2017-04-05T14:18:41Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS EFEITO DA TERMORRETIFICAÇÃO NAS PROPRIEDADES MECÂNICAS DAS MADEIRAS DE Pinus taeda E Eucalyptus grandis |
title |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS |
spellingShingle |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS Modes, Karina Soares heat treatment mechanical properties Pinus Eucalyptus retificação térmica propriedades mecânicas Pinus Eucalyptus |
title_short |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS |
title_full |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS |
title_fullStr |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS |
title_full_unstemmed |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS |
title_sort |
EFFECT OF HEAT TREATMENT ON MECHANICAL PROPERTIES OF Pinus taeda AND Eucalyptus grandis WOODS |
author |
Modes, Karina Soares |
author_facet |
Modes, Karina Soares Santini, Elio José Vivian, Magnos Alan Haselein, Clovis Roberto |
author_role |
author |
author2 |
Santini, Elio José Vivian, Magnos Alan Haselein, Clovis Roberto |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Modes, Karina Soares Santini, Elio José Vivian, Magnos Alan Haselein, Clovis Roberto |
dc.subject.por.fl_str_mv |
heat treatment mechanical properties Pinus Eucalyptus retificação térmica propriedades mecânicas Pinus Eucalyptus |
topic |
heat treatment mechanical properties Pinus Eucalyptus retificação térmica propriedades mecânicas Pinus Eucalyptus |
description |
This study investigated the effect of thermal treatment, employed under two treatment conditions on mechanical properties of wood of Pinus taeda L. and Eucalyptus grandis W. Hill ex Maiden. From each species, three 25-year tress were sampled, and from each one, it was taken the first 2-meter long log, which was obtained from two boards of size 7,0 x 20,0 cm (thickness x width respectively) diametrically opposite from where 30 specimens were saw for each treatment. At the first one, called the combined one, the woods were subjected to heat treatment by autoclaving at 130 / ± 3°C and pressure of 2 kgf / cm ² for 3 hours and, after a conditioning period, subjected to heat in an electric oven at 160 / ± 1°C for the same period. The second treatment consisted only of heat treatment in oven. It was also evaluated the pieces of wood without treatment (control). The mechanical properties were evaluated by means of tests for determining the modulus of elasticity and rupture in bending, maximum resistance to compression parallel to the grain and Janka hardness according to ASTM D 143 (1995), and the impact resistance according to ABNT NBR 7190 (1997). For Pinus taeda wood, it was observed that treatment in an oven gave the worst outcomes, both due to the reduction in the values of supported load of a greater number of mechanical properties evaluated, but also as compared to the lowest increments in resistance when it was observed an increase to the same ones with heat treatment. In Eucalyptus grandis, the combined treatment decreased the greatest number of mechanical properties of wood. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-03-31 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/26467 10.5902/1980509826467 |
url |
https://periodicos.ufsm.br/cienciaflorestal/article/view/26467 |
identifier_str_mv |
10.5902/1980509826467 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/26467/pdf_1 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2017 Ciência Florestal info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2017 Ciência Florestal |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
dc.source.none.fl_str_mv |
Ciência Florestal; Vol. 27 No. 1 (2017); 291-302 Ciência Florestal; v. 27 n. 1 (2017); 291-302 1980-5098 0103-9954 reponame:Ciência Florestal (Online) instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Ciência Florestal (Online) |
collection |
Ciência Florestal (Online) |
repository.name.fl_str_mv |
Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br |
_version_ |
1799944131872555008 |