scholarly journals Physicomechanical characterization and wood machining from 10 12-year-old Hevea progeny clones with potential for furniture

2021 ◽  
Vol 10 (17) ◽  
pp. e72101724239
Author(s):  
Erick Phelipe Amorim ◽  
Juraci de Andrade Barbosa ◽  
Adriano Wagner Ballarin ◽  
Miguel Luiz Menezes de Freitas ◽  
Mario Luiz Teixeira de Moraes ◽  
...  
Keyword(s):  
Compression Test ◽  
Hevea Brasiliensis ◽  
Basic Density ◽  
Anisotropy Coefficient ◽  
Native Forests ◽  
Younger Age ◽  
Low Dimensional ◽  
Wood Machining ◽  
Dimensional Instability ◽  
Machining Properties

The objective of this work was to evaluate the physical, mechanical, and wood machining properties of 10 clonal progenies with 12 years of age aiming to produce furniture. A total of 10 progenies and three trees per progenies were used, totalling 30 trees analyzed. The basic density ranged from 0.404 g.cm-3 (IAC 301) to 0.495 g.cm-3 (IAC 326), being it considered a light wood. The anisotropy coefficient values ranged from 1.05 (IAC 40) to 1.68 (PB 330) considered low to medium dimensional instability allowing the use of wood to produce furniture with low dimensional movements. In the compression test most clones fall under class C30. For MOR and MOE, it was observed greater values for IAC 326 (11666 MPa) and GT1 (9575 MPa). In wood machining tests, slightly raised large and few defects on the surface, being them considered easy to work. The results obtained for Hevea brasiliensis, 12 years old, allow us to affirm that wood from a younger age is an alternative for furniture production and will consequently contribute to the reduction of the exploitation and degradation of native forests in Brazil for this purpose.

scholarly journals Physical and Mechanical Properties of Cassava-Bamboo Composite Lumber

2018 ◽  
Vol 2 (6) ◽  
pp. 6-9
Author(s):  
Ros Syazmini Mohd Ghani ◽  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Testing ◽  
Compression Test ◽  
Basic Density ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Bending Test ◽  
Bambusa Vulgaris ◽  
Physical Testing ◽  
Composite Lumber

The study was carried out to determine the physical and mechanical properties of composite lumber made from cassava (Mahinot esculenta Crantz) and bamboo (Bambusa vulgaris) in different ratios which is 100% cassava with 0% bamboo, 75% cassava with 25% bamboo, 50% cassava with 50% bamboo, 25% cassava with 75% bamboo and 0% cassava with 100% bamboo. The tests samples for determining the strength properties were divided into two categories namely mechanical testing and physical testing. Basic density of the samples was carried out for physical testing. The lowest basic density was in samples with 100% cassava which is 0.49 g/cm3 and highest in samples with 100% bamboo which is 0.68 g/cm3 . Two tests for the mechanical testing are bending test and compression test. In bending test, modulus of elasticity (MOE) and modulus of rupture (MOR) were both highest for samples with 100% bamboo which the reading of MOE was 16794.03 N/mm2 and 122.52 N/mm2 for MOR. Similar to the bending test, compression test is the highest for the samples with 100% bamboo which are 65.58 N/mm2 . From statistical analysis, the basic density, static bending can compression strength give significant value at 95% confidence interval.

scholarly journals Low dimensional instability for semilinear and quasilinear problems in $\mathbb{R}^N$

2009 ◽  
Vol 8 (6) ◽  
pp. 1779-1793 ◽  
Author(s):  
Daniele Castorina ◽  
◽  
Pierpaolo Esposito ◽  
Berardino Sciunzi ◽  
◽  
...  
Keyword(s):  
Quasilinear Problems ◽  
Low Dimensional ◽  
Dimensional Instability

scholarly journals CARACTERIZAÇÃO ANATÔMICA E DESCRIÇÃO FÍSICO-QUÍMICA E MECÂNICA DA MADEIRA DE Mimosa schomburgkii

FLORESTA ◽  
2017 ◽  
Vol 47 (4) ◽  
pp. 383 ◽  
Author(s):  
Luciano Junqueira Costa ◽  
Camila Batista da Silva Lopes ◽  
Matheus Fernandes de Carvalho Reis ◽  
Welliton Lelis Cândido ◽  
Bruno De Freitas Homem de Faria ◽  
...  
Keyword(s):  
Specific Gravity ◽  
Mechanical Strength ◽  
Basic Density ◽  
Raw Material ◽  
Mechanical Resistance ◽  
Extractive Content ◽  
Anisotropy Coefficient ◽  
High Mechanical Strength ◽  
Physical Chemical ◽  
Vessel Elements

O uso de madeira de espécies alternativas na construção civil é uma alternativa para reduzir a utilização concentrada em poucas espécies e evitar a falta de matéria prima no mercado. Diante do exposto, o objetivo deste estudo foi avaliar propriedades físicas, químicas, anatômicas e mecânicas da madeira de Mimosa schomburgkii visando identificar o seu potencial para o uso na construção civil. Foi utilizada a madeira de Mimosa schomburgkii, com idade de 33 anos. As características anatômicas avaliadas foram as dimensões dos elementos de vasos (diâmetro e frequência), dos raios (altura e largura) e das fibras (comprimento, largura total, espessura de parede e de lume). Foi determinada a constituição química com a quantificação do teor de extrativo, lignina e holocelulose.  Para a caracterização físico-mecânica, foram avaliadas a densidade básica e aparente, contrações, o coeficiente de anisotropia, a resistência à flexão estática, à compressão paralela às fibras, à tração paralela às fibras, ao cisalhamento e a dureza Janka (paralela e perpendicular às fibras). A madeira possui fibras libriformes, com comprimento médio de 1180 μm, sendo classificadas como curtas. A densidade básica da madeira é em média 0,80 g.cm-3 (alta densidade), o coeficiente de anisotropia, em média 1,74. A madeira apresenta elevada resistência mecânica, sendo classificada como pertencente à classe C 60. Pelos resultados obtidos no estudo, a madeira de jurema (Mimosa schomburgkii) apresenta aspectos estéticos atrativos e elevada resistência mecânica, sendo, portanto, indicada para uso na construção civil.Palavras–chave: Propriedades da madeira, construção civil, elevada resistência mecânica, alta densidade básica. AbstractAnatomical characterization and physical-chemical and mechanical description of Mimosa schomburgkii wood. The use of wood of alternative species in civil construction has been an option to reduce the concentrated use of few species and to avoid the lack of raw material in the market. The objective of this study was to evaluate the physical, chemical, anatomical and mechanical properties of Mimosa schomburgkii wood, in order to identify its potential use in civil construction. Mimosa schomburgkii wood, at the age of 33 years, was used. The anatomical characteristics evaluated were the dimensions of vessel elements (diameter and frequency), rays (height and width) and fibers (length, width, wall thickness and lumen thickness). The chemical constitution was determined with the quantification of extractive content, lignin and holocellulose. For the physical-mechanical characterization, it was evaluated the specific gravity and apparent density, contractions, anisotropy coefficient, static bending strength, compression strength parallel to grain, traction strength parallel to grain, shear strength and Janka hardness (parallel and perpendicular to grain). The wood has libriform fibers, average length of 1180 μm, and it is classified as short. The wood basic density is on average of 0.80 g.cm-3 (high density). The anisotropy coefficient is on average of 1.74. The wood presents high mechanical strength, being classified as C 60 class. From the results obtained in this study, the Mimosa schomburgkii wood presents attractive aesthetic aspects and high mechanical resistance. Therefore, this wood is indicated for use in civil construction.Keywords: Wood properties, civil construction, high mechanical strength, high specific gravity.

scholarly journals Keragaan Permesinan dan Keteguhan Rekat Kayu Jati Cepat Tumbuh Terdensifikasi

2020 ◽  
Vol 26 (1) ◽  
pp. 1-7
Author(s):  
Herianto Siahaan ◽  
Imam Wahyudi
Keyword(s):  
Treated Wood ◽  
Raw Material ◽  
Densified Wood ◽  
Machining Performance ◽  
Bonding Quality ◽  
Furniture Manufacturing ◽  
Wood Machining ◽  
Machining Properties ◽  
Hierarchy Process

The objective of this study was to analyze machining performance (characteristic and quality), as well as bonding quality of densified wood, and then compared to those of un-treated (control) wood and boron-treated wood. Characteristic and quality of machining properties were directly evaluated by qualified technician during processing, while bonding quality was evaluated through its shear strength. The results showed that densification employed was able to improve machining performance and bonding quality of the 5-year-old faster-grown teakwood. Compared to control wood and boron-treated wood, machining performances of densified teakwood are greater, while bonding quality increased by 18.79 and 26.86%, respectively. The surface became much fine and even, and has similar colour to older teakwood. Analysis hierarchy process (AHP) proves that densified teakwood is the best raw material for furniture manufacturing since its machining performances, appearance, colour, and bonding quality are better either than control wood or boron-treated wood.   Keywords: AHP, bonding quality, densification, faster-grown teakwood, machining performance

scholarly journals Characterization of properties and deterioration by termites in the Pinus elliottii Engelm. wood

2020 ◽  
Vol 19 (3) ◽  
pp. 252-257
Author(s):  
Ezequiel Gallio ◽  
Henrique Weber Dalla Costa ◽  
Laíse Guerreiro ◽  
Nidria Dias Cruz ◽  
Rafael Beltrame ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Basic Density ◽  
Physical And Mechanical Properties ◽  
Hardness Test ◽  
Pinus Elliottii ◽  
Linear Shrinkage ◽  
Chemical Components ◽  
Technological Properties ◽  
Anisotropy Coefficient ◽  
Technological Parameters

The technological properties of wood are constituted by parameters, which after being analyzed, make it possible to define an appropriate use for this material. However, the deterioration of the wood due to the attack of termites, which find their food source in the chemical components, ends up altering these original technological characteristics, reducing their useful life and compromising their use. Thus, this study aimed to determine some technological properties of Pinus elliottii, as well as to evaluate the influence of deterioration caused by Nasutitermes termites in this wood. Specimens with dimensions of 20 x 20 x 150 mm (tangential x radial x longitudinal) were used as specimens. The physical properties evaluated were the basic density and linear shrinkage (tangential and radial contractions, and anisotropy coefficient), while the mechanical properties were represented through the Janka hardness test and compression parallel to the fibers. After 40 days of the biodeterioration test with Nasutitermes termites, changes in the equilibrium moisture content, retractability, water absorption rate and mechanical properties were evaluated. While the physical and mechanical properties evaluated showed values similar to those found in the literature, the deterioration caused by termites caused a reduction in hardness and parameters related to compression, increasing the dimensional instability of the wood, represented by the variation in the anisotropy coefficient. This made it possible to conclude that the biodeterioration resulting from the attack of termites directly affected the technological parameters of the wood, and consequently, its quality for the use in the purpose it could initially be destined.

scholarly journals Effects of termal treatment on the physical properties of Buchenavia sp. (branquilho) wood

2022 ◽  
Vol 22 (1) ◽  
pp. 95-103
Author(s):  
Laysa Teles Vollbrecht ◽  
Adriano Reis Prazeres Mascarenhas ◽  
Rafael Rodolfo de Melo ◽  
Maúcha Fernanda de Mota Lima ◽  
Ricardo Pereira Soteil ◽  
...  
Keyword(s):  
Physical Properties ◽  
Apparent Density ◽  
Basic Density ◽  
Heat Treatments ◽  
Thermal Treatments ◽  
Mean Values ◽  
Construction Market ◽  
Anisotropic Factor ◽  
Increasing Temperature ◽  
Dimensional Instability

Abstract This work aimed to evaluate the effect of heat treatment on the physical properties of wood from Buchenavia sp. The heat treatments were carried out at temperatures of 180 °C and 200 °C for 2 h. Apparent density (AD), basic density (BD), porosity (Ф), mass loss, longitudinal (LS), radial (RS), tangential (TS) and volumetric (VS) shrinkages and anisotropic factor (AF) were determined. The lowest values of basic density (0.67 g cm-3), apparent density (0.77 gcm-3), and porosity (43.3%) were observed for the wood treated at a temperature of 200 °C. Mass losses increased with increasing temperature and the highest values were observed under the condition of 200 °C (9.3%). The LS and AF was not affected by heat treatments. The mean values for RS (3.1%), TS (5.1%), and VS (9.1%) were reduced after the performance of heat treatments at temperatures of 180°C and 200°C, which did not differ from each other. The thermal treatments were able to reduce the dimensional instability of Buchenavia sp. Thermal treatments enhance the use of less prestigious Amazonian woods in the civil construction market.

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