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Pesquisa Florestal Brasileira
Article . 2016 . Peer-reviewed
License: CC BY NC ND
Data sources: Crossref
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Pesquisa Florestal Brasileira
Article
License: CC BY NC ND
Data sources: UnpayWall
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Propriedades físico-mecânicas da madeira de Chrysophyllum marginatum

Authors: Jussan Albarello de Cezaro; Rômulo Trevisan; Rafaelo Balbinot;

Propriedades físico-mecânicas da madeira de Chrysophyllum marginatum

Abstract

Esse estudo objetivou avaliar as propriedades físico-mecânicas da madeira de Chrysophyllum marginatum (Hook. e Arn.) Radlk. Foram utilizadas três árvores com 20,3 ± 6 cm de diâmetro. Por regressão, determinou-se a variação no sentido base-topo de retratibilidade, coeficiente anisotrópico, teor de umidade saturado e massa específica básica. Para caracterizar a flexão estática na primeira tora, nas condições úmida e seca ao ar, foi realizada análise de variância pelo teste de Tukey. Observou-se decréscimo das contrações radial e tangencial e da massa específica básica da madeira no sentido base-topo, inversamente ao teor de umidade saturado, que apresentou uma variação crescente. Na análise do coeficiente anisotrópico, verificou-se uma tendência de acréscimo até 1,30 m de altura, seguido de estabilização a partir dessa posição até o topo. A contração longitudinal apresentou tendência de decréscimo até, aproximadamente, 40% de altura, seguido de acréscimo até a altura de inserção do primeiro galho vivo. As médias do coeficiente anisotrópico e da massa específica básica foram 2,3 kg m-3 e 594 kg m-3, respectivamente. A condição de umidade seca ao ar apresentou maior resistência à flexão estática do que quando saturada e os valores dos módulos de elasticidade e de ruptura foram semelhantes aos encontrados em estudos de Eucalyptus saligna e Carya illinoinensis.Physical and mechanical properties of Chrysophyllum marginatum woodThis study aimed to evaluate the physical and mechanical properties of the wood of Chrysophyllum marginatum (Hook. And Arn.) Radlk. We used three trees with 20.3 ± 6 cm of diameter. It was determined by regression analysis the variation bottom-up of shrinkage, anisotropic coefficient, saturate moisture content and basic density. To characterize the static bending in the first log, in saturate and air dried conditions, it was performed variance analysis using Tukey›s test. It was observed a decrease in radial and tangential contractions and basic density on bottom-up direction. Saturate moisture content increased, considering the same direction. Anisotropic coefficient presented increase tendency up to 1.30 m height followed by stabilization from that position to the top. It was observed decreasing tendency of longitudinal contraction to approximately 40% of total height, followed by increasing up to the insertion of the first living branch. Mean anisotropic coefficient and basic density were 2.3kg m-³ and 594 kg m-³, respectively. Air dry condition showed greater static bending resistance than when saturate. Values of rupture and elasticity modulus were similar to those found in studies with Eucalyptus saligna and Carya illinoinensis.Index terms: Shrinkage; Anisotropic coefficient; Static bending

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
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