Interrelationships of specific gravity, stiffness, and strength of yellow pine across five decades

França, Frederico José Nistal; Shmulsky, Rubin; Ratcliff, Tedrick; Farber, Benjamin; Senalik, C. Adam; Ross, Robert; Seale, R. Daniel

doi:10.15376/biores.16.2.3815-3826

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Additionally, Firmanti et al (2005) and França et al (2021) stated that the strength and stiffness of wood are primarily determined by specific gravity, fiber and tissue characteristics, and defects or flaws of wood, e.g., density, knots (number, size, and position of knots on the board), slope of the grain, and interlocked grain. Moreover, there can be great differences between different tree species or even among the same tree species.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the strength characteristics of Cunninghamia lanceolata timber using continuous mechanical stress rating equipment

Lee

Lin

Chung

et al. 2022

BioRes

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Before timber is used for engineering and structural purposes, it is necessary to grade the strength of the timber. In order to obtain the static modulus of elasticity value of timber quickly and accurately, this study used ultrasonic waves and continuous mechanical stress rating equipment and two non-destructive test methods to analyze the correlation between the non-destructive test measured value and the static modulus of elasticity value. It also evaluated the influence of the feeding orientation of the boards, the forward and reverse feed directions, feeding speed, and break area ratio. The analysis results indicated that the modulus of elasticity value determined through continuous mechanical stress rating equipment had the highest correlation with the static modulus of elasticity value. Moreover, according to the results, the feeding orientation of the boards, the forward and reverse feed directions, and the feeding speed did not influence the prediction of the continuous mechanical stress rating equipment modulus of elasticity value. Meanwhile, to ensure the accuracy and uniformity of the continuous mechanical stress rating equipment modulus of elasticity detection value, it is necessary to avoid an excessively high break area ratio in Cunninghamia lanceolata timber during the preparation process.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the strength characteristics of Cunninghamia lanceolata timber using continuous mechanical stress rating equipment

Lee

Lin

Chung

et al. 2022

BioRes

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“…Vivian et al (2012) corroboram este fato, uma vez que referem que existe uma correlação positiva entre o MOR e o MOE, tendo obtido um coeficiente de Pearson de 0,85 para uma amostra de peças de madeira de Eucalyptus cloeziana. Além disso,França et al (2021) também apresentam correlações positivas entre o MOR e o MOE, cujos coeficientes de determinação R² variaram entre 0,60 e 0,69, quando analisaram madeira de pinus (pinus spp.) proveniente de plantações nos Estados Unidos da América.…”

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Avaliação das propriedades físicas e mecânicas da madeira de paricá (Schizolobium amazonicum) utilizada na indústria de compensados no Estado do Maranhão

Lima

Nascimento

Santos

et al. 2022

RSD

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O paricá (Schizolobium amazonicum) é uma espécie nativa da região amazônica, cujas características físicas e mecânicas estão na base da aceitação desta espécie por parte do mercado madeireiro, sobretudo através da sua utilização para produção de painéis de compensado e painéis de lâminas paralelas (LVL). O objetivo deste trabalho foi avaliar as propriedades físicas e mecânicas da madeira de paricá utilizadas na indústria de compensados no Estado do Maranhão. Foram analisados o teor de umidade, as densidades aparente e básica, a variação volumétrica, as resistências à compressão paralela e perpendicular à grã, a resistência ao cisalhamento paralelo à grã, a resistência à flexão e os módulos de elasticidade à compressão paralela à grã e à flexão. O lote de madeira analisado apresentou teor de umidade em equilíbrio ao ar (11,33%), baixa densidade aparente (275,57 kg.m-3) e variação volumétrica reduzida (8,75%), estando estas propriedades abaixo dos valores apresentados pela bibliografia, para madeiras de idades semelhantes. As propriedades mecânicas analisadas (resistência à compressão paralela à grã, resistência à compressão normal à grã, módulo de ruptura na flexão, módulo de elasticidade na flexão, resistência ao cisalhamento paralelo à grã e módulo de elasticidade à compressão paralela à grã) apresentaram igualmente valores inferiores à média dos resultados obtidos na bibliografia. Desta forma, a utilização de madeira de paricá em painéis de compensados constitui uma alternativa válida, considerando que estes são leves e estáveis no que concerne à variação dimensional, quando comparados com os produtos provenientes de madeira de eucalipto. No entanto, é pertinente realizar ações que visam melhorar as propriedades mecânicas da madeira de paricá, de forma a aumentar as propriedades de resistência e de rigidez.

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In Situ Synthesis of Fe3O4 Nanoparticles and Wood Composite Properties of Three Tropical Species

Moya

Merazzo

2022

Materials

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Magnetic wood is a composite material that achieves harmony between both woody and magnetic functions through the active addition of magnetic characteristics to the wood itself. In addition to showing magnetic characteristics, magnetic wood offers low specific gravity, humidity control and acoustic absorption ability. It has potential for broad applications in the fields of electromagnetic wave absorption, electromagnetic interference shielding, furniture, etc. This work reports on the synthesis of Fe3O4 nanoparticles (NPs) in wood from three tropical species (Pinus oocarpa, Vochysia ferruginea and Vochysia guatemalensis) using a solution of iron (III) hexahydrate and iron (II) chloride tetrahydrate with a molar ratio of 1.6:1 at a concentration of 1.2 mol/L ferric chlorate under 700 kPa pressure for 2 h. Afterward, the wood samples were impregnated with an ammonia solution with three different immersion times. The treated wood (wood composites) was evaluated for the weight gain percentage (WPG), density, ash content and Fe3O4 content by the Fourier transform infrared spectroscopy (FTIR) spectrum, X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). The results show that the species P. oocarpa had the lowest values of WPG, and its density decreased in relation to the untreated wood, with lower ash and Fe3O4 NP content. The XRD and some FTIR signals associated with changes in the wood component showed small differences from the untreated wood. Fe3O4 NPs presented nanoparticles with the smallest diameter of (approx. 7.3 to 8.5 nm), and its saturation magnetization (Ms) parameters were the lowest. On the other hand, V. guatemalensis was the species with the best Ms values, but the wood composite had the lowest density. In relation to the different immersion times, the magnetic properties were not statistically affected. Finally, the magnetization values of the studied species were lower than those of the pure Fe3O4 nanoparticles, since the species only have a certain amount of these nanoparticles (NPs), and this was reflected proportionally in the magnetization of saturation.

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Interrelationships of specific gravity, stiffness, and strength of yellow pine across five decades

Cited by 3 publications

References 3 publications

Evaluation of the strength characteristics of Cunninghamia lanceolata timber using continuous mechanical stress rating equipment

Evaluation of the strength characteristics of Cunninghamia lanceolata timber using continuous mechanical stress rating equipment

Avaliação das propriedades físicas e mecânicas da madeira de paricá (Schizolobium amazonicum) utilizada na indústria de compensados no Estado do Maranhão

In Situ Synthesis of Fe3O4 Nanoparticles and Wood Composite Properties of Three Tropical Species

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