WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência Florestal (Online) |
Texto Completo: | https://periodicos.ufsm.br/cienciaflorestal/article/view/487 |
Resumo: | The aim of this study was to evaluate the vaporization effects on the crushing strength at limit of proportionality on perpendicular compression, crushing strength and modulus of elasticity in parallel compression to the fiber and shear strength (radial and tangential direction) on logs and sawn wood of two sources of Eucalyptus dunnii. The mechanical attempts were performed under the Copant standards in the climatized conditions (12%). To do so, about two thirds of the logs, with a diameter between 20-30 cm, were vaporized at 100o C and 100% of relative humidity for 20 hours, while the remaining logs were kept as control. From each log, a central plank radially directed with eight centimeter of thickness was taken, from which small beams of 8 cm x 8 cm were taken. Half of the small beams from the vaporized logs were once again submitted to vaporization under the same previously described conditions for a period of 3 hours, thus obtaining three different levels of comparison (control, vaporized on logs and presteaming wood). The results showed a remarkable reduction on the crushing strength in parallel compression to the fiber and shear strength (radial and tangential direction) with the vaporization on the two conditions and sources of Eucalyptus dunnii used. On the other hand, the crushing strength at limit of proportionality on perpendicular compression and modulus of elasticity in parallel compression did not show any change with the vaporization. |
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WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunniiCaracterísticas estruturais da madeira de Pinus elliottii Engelm aos 30 anos de idade.Eucalyptus dunniiwood vaporizationperpendicular compressionparallel compres-sion.Pinus elliottiiflexão estáticalenho outonalnúmero de anéis de crescimento.The aim of this study was to evaluate the vaporization effects on the crushing strength at limit of proportionality on perpendicular compression, crushing strength and modulus of elasticity in parallel compression to the fiber and shear strength (radial and tangential direction) on logs and sawn wood of two sources of Eucalyptus dunnii. The mechanical attempts were performed under the Copant standards in the climatized conditions (12%). To do so, about two thirds of the logs, with a diameter between 20-30 cm, were vaporized at 100o C and 100% of relative humidity for 20 hours, while the remaining logs were kept as control. From each log, a central plank radially directed with eight centimeter of thickness was taken, from which small beams of 8 cm x 8 cm were taken. Half of the small beams from the vaporized logs were once again submitted to vaporization under the same previously described conditions for a period of 3 hours, thus obtaining three different levels of comparison (control, vaporized on logs and presteaming wood). The results showed a remarkable reduction on the crushing strength in parallel compression to the fiber and shear strength (radial and tangential direction) with the vaporization on the two conditions and sources of Eucalyptus dunnii used. On the other hand, the crushing strength at limit of proportionality on perpendicular compression and modulus of elasticity in parallel compression did not show any change with the vaporization. No presente estudo, seis árvores de um povoamento de Pinus elliottii com 30 anos de idade foram coletadas e transformadas em toras de 2,5 m de comprimento. De cada uma das duas primeiras toras, retirou-se um pranchão central, do qual foram confeccionados, segundo a norma ASTM D143-93 (1995), nas regiões próximas à medula e à casca, os corpos de prova utilizados nos ensaios de flexão estática. As propriedades de flexão (módulos de elasticidade e de ruptura) e massa específica básica a 12% de umidade foram relacionados como número de anéis de crescimento e a porcentagem de lenho tardio determinados na secção transversal para cada corpo de prova. Os resultados evidenciaram, para as propriedades estudadas, a existência de diferenças significativas entre as posições.Universidade Federal de Santa Maria2000-06-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsm.br/cienciaflorestal/article/view/48710.5902/19805098487Ciência Florestal; Vol. 10 No. 2 (2000); 135-144Ciência Florestal; v. 10 n. 2 (2000); 135-1441980-50980103-9954reponame:Ciência Florestal (Online)instname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMporhttps://periodicos.ufsm.br/cienciaflorestal/article/view/487/373Haselein, Clóvis RobertoCechin, EmersonSantini, Elio JoséGatto, Darci Albertoinfo:eu-repo/semantics/openAccess2017-06-06T18:45:52Zoai:ojs.pkp.sfu.ca:article/487Revistahttp://www.ufsm.br/cienciaflorestal/ONGhttps://old.scielo.br/oai/scielo-oai.php||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br1980-50980103-9954opendoar:2017-06-06T18:45:52Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii Características estruturais da madeira de Pinus elliottii Engelm aos 30 anos de idade. |
title |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii |
spellingShingle |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii Haselein, Clóvis Roberto Eucalyptus dunnii wood vaporization perpendicular compression parallel compres-sion. Pinus elliottii flexão estática lenho outonal número de anéis de crescimento. |
title_short |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii |
title_full |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii |
title_fullStr |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii |
title_full_unstemmed |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii |
title_sort |
WOOD VAPORIZATION EFFECT ON SOME MECHANICAL PROPERTIES OF Eucalyptus dunnii |
author |
Haselein, Clóvis Roberto |
author_facet |
Haselein, Clóvis Roberto Cechin, Emerson Santini, Elio José Gatto, Darci Alberto |
author_role |
author |
author2 |
Cechin, Emerson Santini, Elio José Gatto, Darci Alberto |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Haselein, Clóvis Roberto Cechin, Emerson Santini, Elio José Gatto, Darci Alberto |
dc.subject.por.fl_str_mv |
Eucalyptus dunnii wood vaporization perpendicular compression parallel compres-sion. Pinus elliottii flexão estática lenho outonal número de anéis de crescimento. |
topic |
Eucalyptus dunnii wood vaporization perpendicular compression parallel compres-sion. Pinus elliottii flexão estática lenho outonal número de anéis de crescimento. |
description |
The aim of this study was to evaluate the vaporization effects on the crushing strength at limit of proportionality on perpendicular compression, crushing strength and modulus of elasticity in parallel compression to the fiber and shear strength (radial and tangential direction) on logs and sawn wood of two sources of Eucalyptus dunnii. The mechanical attempts were performed under the Copant standards in the climatized conditions (12%). To do so, about two thirds of the logs, with a diameter between 20-30 cm, were vaporized at 100o C and 100% of relative humidity for 20 hours, while the remaining logs were kept as control. From each log, a central plank radially directed with eight centimeter of thickness was taken, from which small beams of 8 cm x 8 cm were taken. Half of the small beams from the vaporized logs were once again submitted to vaporization under the same previously described conditions for a period of 3 hours, thus obtaining three different levels of comparison (control, vaporized on logs and presteaming wood). The results showed a remarkable reduction on the crushing strength in parallel compression to the fiber and shear strength (radial and tangential direction) with the vaporization on the two conditions and sources of Eucalyptus dunnii used. On the other hand, the crushing strength at limit of proportionality on perpendicular compression and modulus of elasticity in parallel compression did not show any change with the vaporization. |
publishDate |
2000 |
dc.date.none.fl_str_mv |
2000-06-30 |
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/487 10.5902/19805098487 |
url |
https://periodicos.ufsm.br/cienciaflorestal/article/view/487 |
identifier_str_mv |
10.5902/19805098487 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/487/373 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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. 10 No. 2 (2000); 135-144 Ciência Florestal; v. 10 n. 2 (2000); 135-144 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_ |
1799944125468901376 |