INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência Florestal (Online) |
Texto Completo: | https://periodicos.ufsm.br/cienciaflorestal/article/view/22740 |
Resumo: | This paper deals with the influence of temperature in a range from 20 °C to 240 °C, in the physical properties of wood: humidity and specific and mechanical masses: strength and modulus of elasticity for the parallel compression to the fibers. The experimental program was performed with 78 specimens of hybrids of Eucalyptus grandis x Eucalyptus urophylla with mean apparent specific gravity of 671 kg/m3 and moisture content of 11.14%. The test procedures prescribed by NBR 7190 were followed. The results show a linear decrease in moisture content with increasing temperature up to 160°C. Two straight lines are noteworthy, the first one from 20°C to 65°C with slight decrease in moisture content, reaching 4% and the second one from 65°C to 160°C with the sharpest loss reaching 0% content of moisture. Above 160°C, the moisture content is zero, so that the wood loses only organic material, coming to lose 20% by weight when it reaches a temperature of 240°C. The specific mass remains practically constant until the temperature of 100°C. Temperature between 100°C to 240°C, the specific mass decreases linearly reaching 20 per cent. The strength to compression parallel to the fibers increases linearly with the temperature, reaching 19% at 100°C. Above this temperature, the behavior is inverse, with linear decrease until the temperature of 180°C. From 180°C the compression strength decreases reaching the temperature of 240°C at 32% lower than the resistance at the temperature of 20ºC. As the modulus of elasticity decreases, it only increases the temperature. Up to the temperature of 120°C, it has a very slight linear decrease of around 8 per cent. However, between 120°C and 200°C the decrease is also linear, but more accentuated, reaching 38 per cent. |
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INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUSINFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOShigh temperaturesthermal degradation of woodstrength of wood.altas temperaturasdegradação térmica da madeiraresistência da madeira.This paper deals with the influence of temperature in a range from 20 °C to 240 °C, in the physical properties of wood: humidity and specific and mechanical masses: strength and modulus of elasticity for the parallel compression to the fibers. The experimental program was performed with 78 specimens of hybrids of Eucalyptus grandis x Eucalyptus urophylla with mean apparent specific gravity of 671 kg/m3 and moisture content of 11.14%. The test procedures prescribed by NBR 7190 were followed. The results show a linear decrease in moisture content with increasing temperature up to 160°C. Two straight lines are noteworthy, the first one from 20°C to 65°C with slight decrease in moisture content, reaching 4% and the second one from 65°C to 160°C with the sharpest loss reaching 0% content of moisture. Above 160°C, the moisture content is zero, so that the wood loses only organic material, coming to lose 20% by weight when it reaches a temperature of 240°C. The specific mass remains practically constant until the temperature of 100°C. Temperature between 100°C to 240°C, the specific mass decreases linearly reaching 20 per cent. The strength to compression parallel to the fibers increases linearly with the temperature, reaching 19% at 100°C. Above this temperature, the behavior is inverse, with linear decrease until the temperature of 180°C. From 180°C the compression strength decreases reaching the temperature of 240°C at 32% lower than the resistance at the temperature of 20ºC. As the modulus of elasticity decreases, it only increases the temperature. Up to the temperature of 120°C, it has a very slight linear decrease of around 8 per cent. However, between 120°C and 200°C the decrease is also linear, but more accentuated, reaching 38 per cent.O trabalho trata da influência da temperatura, em um intervalo de 20ºC a 24ºC, nas propriedades físicas da madeira: umidade e massa específica e mecânicas: resistência e módulo de elasticidade à compressão paralela às fibras. O programa experimental foi realizado com 78 corpos de prova, de híbridos de Eucalyptus grandis com Eucalyptus urophylla, com massa específica aparente média de 671 kg/m3 e teor de umidade de 11,14%. Foram seguidos os procedimentos dos ensaios prescritos pela NBR 7190. Os resultados mostram uma diminuição linear do teor de umidade com o aumento da temperatura até 160°C. Destacam-se duas retas, a primeira de 20°C até 65°C com pequeno decréscimo do teor de umidade, chegando a 4% e a segunda de 65°C até 160°C com perda mais acentuada chegando a 0% de teor de umidade. Acima de 160°C, não apresentando mais umidade, a madeira perde apenas material orgânico, chegando a 20% de perda de massa quando atinge uma temperatura de 240°C. A massa específica praticamente permanece constante até a temperatura de 100ºC. A partir da temperatura de 100ºC até 240ºC a massa específica decresce linearmente chegando a 20%. A resistência à compressão paralela às fibras aumenta linearmente com a temperatura, chegando a 19% na temperatura de 100°C e, após esta temperatura, o comportamento se inverte com decréscimo linear até a temperatura de 180ºC. A partir de 180ºC, a queda de resistência é acentuada, chegando, na temperatura de 240ºC, a 32% menor do que a resistência na temperatura de 20ºC. O módulo de elasticidade diminui, apenas aumenta a temperatura. Até 120ºC existe uma diminuição linear não muito acentuada, em torno de 8%. Já de 120ºC até 200ºC a diminuição também é linear, porém, bastante acentuada chegando a 38%.Universidade Federal de Santa Maria2016-06-20info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsm.br/cienciaflorestal/article/view/2274010.5902/1980509822740Ciência Florestal; Vol. 26 No. 2 (2016); 389-400Ciência Florestal; v. 26 n. 2 (2016); 389-4001980-50980103-9954reponame:Ciência Florestal (Online)instname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMporhttps://periodicos.ufsm.br/cienciaflorestal/article/view/22740/13423Copyright (c) 2016 Ciência Florestalinfo:eu-repo/semantics/openAccessCarrasco, Edgar Vladimiro MantillaOliveira, Ana Lúcia CrespoMantilla, Judy Norka Rodo2017-04-06T14:14:08Zoai:ojs.pkp.sfu.ca:article/22740Revistahttp://www.ufsm.br/cienciaflorestal/ONGhttps://old.scielo.br/oai/scielo-oai.php||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br1980-50980103-9954opendoar:2017-04-06T14:14:08Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS |
title |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS |
spellingShingle |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS Carrasco, Edgar Vladimiro Mantilla high temperatures thermal degradation of wood strength of wood. altas temperaturas degradação térmica da madeira resistência da madeira. |
title_short |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS |
title_full |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS |
title_fullStr |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS |
title_full_unstemmed |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS |
title_sort |
INFLUENCE OF TEMPERATURE IN THE STRENGTH AND MODULUS OF ELASTICITY IN WOOD FROM HYBRIDS OF EUCALYPTUS |
author |
Carrasco, Edgar Vladimiro Mantilla |
author_facet |
Carrasco, Edgar Vladimiro Mantilla Oliveira, Ana Lúcia Crespo Mantilla, Judy Norka Rodo |
author_role |
author |
author2 |
Oliveira, Ana Lúcia Crespo Mantilla, Judy Norka Rodo |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Carrasco, Edgar Vladimiro Mantilla Oliveira, Ana Lúcia Crespo Mantilla, Judy Norka Rodo |
dc.subject.por.fl_str_mv |
high temperatures thermal degradation of wood strength of wood. altas temperaturas degradação térmica da madeira resistência da madeira. |
topic |
high temperatures thermal degradation of wood strength of wood. altas temperaturas degradação térmica da madeira resistência da madeira. |
description |
This paper deals with the influence of temperature in a range from 20 °C to 240 °C, in the physical properties of wood: humidity and specific and mechanical masses: strength and modulus of elasticity for the parallel compression to the fibers. The experimental program was performed with 78 specimens of hybrids of Eucalyptus grandis x Eucalyptus urophylla with mean apparent specific gravity of 671 kg/m3 and moisture content of 11.14%. The test procedures prescribed by NBR 7190 were followed. The results show a linear decrease in moisture content with increasing temperature up to 160°C. Two straight lines are noteworthy, the first one from 20°C to 65°C with slight decrease in moisture content, reaching 4% and the second one from 65°C to 160°C with the sharpest loss reaching 0% content of moisture. Above 160°C, the moisture content is zero, so that the wood loses only organic material, coming to lose 20% by weight when it reaches a temperature of 240°C. The specific mass remains practically constant until the temperature of 100°C. Temperature between 100°C to 240°C, the specific mass decreases linearly reaching 20 per cent. The strength to compression parallel to the fibers increases linearly with the temperature, reaching 19% at 100°C. Above this temperature, the behavior is inverse, with linear decrease until the temperature of 180°C. From 180°C the compression strength decreases reaching the temperature of 240°C at 32% lower than the resistance at the temperature of 20ºC. As the modulus of elasticity decreases, it only increases the temperature. Up to the temperature of 120°C, it has a very slight linear decrease of around 8 per cent. However, between 120°C and 200°C the decrease is also linear, but more accentuated, reaching 38 per cent. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-06-20 |
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/22740 10.5902/1980509822740 |
url |
https://periodicos.ufsm.br/cienciaflorestal/article/view/22740 |
identifier_str_mv |
10.5902/1980509822740 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/22740/13423 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2016 Ciência Florestal info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2016 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. 26 No. 2 (2016); 389-400 Ciência Florestal; v. 26 n. 2 (2016); 389-400 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_ |
1799944131080880128 |