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      EFEITO DA MASSA ESPECÍFICA NAS PROPRIEDADES DE FLEXÃO ESTÁTICA EM CONPENSADOS DE Pinus elliottii Engelm Translated title: EFECT OF THE SPECIFIC GRAVITY ON STATIC BENDING PROPERTIES IN PLYWOOD OF Pinus elliottii Engelm

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          Abstract

          RESUMO O presente trabalho teve por objetivo a determinação de relações entre as propriedades de resistência e rigidez à flexão estática e a massa especifica de painéis compensados de 5 lâminas feitos de madeira de Pinus elliottii Engelm, proveniente de plantios de 30 anos de idade. Foram estudadas várias relações lineares simples, múltiplas e polinomiais, envolvendo o módulo de ruptura (MOR), o módulo de elasticidade (MOE), a tensão no limite proporcional (TLP) e a massa específica (Me) dos compensados. A massa específica mostrou não ser indicador muito preciso das propriedades de resistência e rigidez dos painéis. As propriedades dos compensados à flexão estática, em termos de MOE, MOR e TLP mostraram baixos coeficientes de correlação e determinação ajustados por regressão linear simples, indicando pouca dependência de massa específica. O módulo de ruptura à flexão nas direções principais (x e Y), teve uma forte dependência do módulo de elasticidade e de tensão no limite proporcional. Os coeficientes de correlação dos melhores modelos de regressão nas duas direções variaram de 0,85 a 0,91, Histogramas de frequência da massa específica dos compensados mostraram uma distribuição unimodal homogênea, enquanto que o MOE e o MOR apresentaram uma distribuição unimodal com assimetria positiva.

          Translated abstract

          ABSTRACT The objetive of this work was to determine the relation between the rigidity and strength properties in static bending and specific gravity of plywood manufactured from five veneers of Pinus elliottii Engelm from 30 year-old plantations. Linear simples, multiple and polynomial relations involving the modulus of rupture (MOR), modulus of elasticity (MOE), stress at proportional limit (TLP) and specific gravity (Me) of the plywood were studied. The specific gravity did not prove to be a very exact indicator of the rigidity and strength properties of the plywood. The MOE, MOR and TLP in static bending of the plywood showed low coefficients of correlations and determination adjusted for simple linear regression, indicating a little dependence of the specific gravity, the modulus of rupture in static bending on the principal directions (X and Y) had a strong dependence of the modulus of elasticity and stress at proportional limit. The coefficients of correlations of the best models of regression in the two directions varied from 0.85 to 0,91. The frequency histograms of the specific gravity of plywood showed a unimodal homogeneous distribution, while MOE and MOR showed a unimodal distribution with positive asymmetric skewness.

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          Most cited references 7

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          How growth rate affects properties of softwood veneer

           J Lutz (1964)
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            How and log characteristics affecting veneer production.

             J Lutz (1971)
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              Radiata pine plywood - The strength properties of small clear specimens of plywood

               H. BIER (1984)
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                Author and article information

                Contributors
                Role: ND
                Journal
                cflo
                Ciência Florestal
                Ciênc. Florest.
                Universidade Federal de Santa Maria (Santa Maria, RS, Brazil )
                0103-9954
                1980-5098
                June 1999
                : 9
                : 1
                : 161-171
                Affiliations
                Botucatu orgnameUniversidade Estadual Paulista orgdiv1Faculdade de Ciências Agrárias orgdiv2Departamento de Ciências Florestais Brazil
                Article
                S1980-50981999000100161
                10.5902/19805098374

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 10, Pages: 11
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