INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS
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 specime...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Portuguese |
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Universidade Federal de Santa Maria
2016-01-01
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| Series: | Ciência Florestal |
| Online Access: | http://www.redalyc.org/articulo.oa?id=53446151005 |
| _version_ | 1818333505130594304 |
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| author | Edgar Vladimiro Mantilla Carrasco Ana Lúcia Crespo Oliveira Judy Norka Rodo Mantilla |
| author_facet | Edgar Vladimiro Mantilla Carrasco Ana Lúcia Crespo Oliveira Judy Norka Rodo Mantilla |
| author_sort | Edgar Vladimiro Mantilla Carrasco |
| collection | DOAJ |
| 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/m 3 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 20 ºC. 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. |
| first_indexed | 2024-12-13T13:52:42Z |
| format | Article |
| id | doaj.art-1f3f94c58447449f826760bc6ca6db66 |
| institution | Directory Open Access Journal |
| issn | 0103-9954 1980-5098 |
| language | Portuguese |
| last_indexed | 2024-12-13T13:52:42Z |
| publishDate | 2016-01-01 |
| publisher | Universidade Federal de Santa Maria |
| record_format | Article |
| series | Ciência Florestal |
| spelling | doaj.art-1f3f94c58447449f826760bc6ca6db662022-12-21T23:43:03ZporUniversidade Federal de Santa MariaCiência Florestal0103-99541980-50982016-01-01262389400INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOSEdgar Vladimiro Mantilla CarrascoAna Lúcia Crespo OliveiraJudy Norka Rodo MantillaThis 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/m 3 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 20 ºC. 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.http://www.redalyc.org/articulo.oa?id=53446151005 |
| spellingShingle | Edgar Vladimiro Mantilla Carrasco Ana Lúcia Crespo Oliveira Judy Norka Rodo Mantilla INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS Ciência Florestal |
| title | INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS |
| title_full | INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS |
| title_fullStr | INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS |
| title_full_unstemmed | INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS |
| title_short | INFLUÊNCIA DA TEMPERATURA NA RESISTÊNCIA E NO MÓDULO DE ELASTICIDADE EM MADEIRA DE HÍBRIDOS DE EUCALIPTOS |
| title_sort | influencia da temperatura na resistencia e no modulo de elasticidade em madeira de hibridos de eucaliptos |
| url | http://www.redalyc.org/articulo.oa?id=53446151005 |
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