&lt;b&gt;Evaluation of modulus of elasticity in static bending of particleboards manufactured with &lt;i&gt;Eucalyptus grandis&lt;/i&gt; wood and oat hulls

Varanda, Luciano Donizeti; Christofóro, André Luis; Almeida, Diego Henrique de; Silva, Diogo Aparecido Lopes; Panzera, Túlio Hallak; Lahr, Francisco Antônio Rocco

doi:10.4025/actascitechnol.v36i3.21077

Cited by 10 publications

(9 citation statements)

References 11 publications

(2 reference statements)

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“…For stabilization and complete cure of resin, panels were conditioned for 48 hours under environmental conditions. After this period, they were cut for subsequent removal of the specimens for physical and mechanical tests ( Figure 1(e)) [26,27].…”

Section: Methodsmentioning

confidence: 99%

Effect of Alternative Wood Species and First Thinning Wood on Oriented Strand Board Performance

Ferro

Souza

Araujo

et al. 2018

Advances in Materials Science and Engineering

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is study aimed to evaluate the feasibility of using and influence of alternative wood species such as Cambará, Paricá, Pinus, and wood from first thinning operations on oriented strand board (OSB) physical and mechanical properties. Besides that, an alternative resin, castor oil-based polyurethane, was used to bond the particles, due to the better environmental performance when compared to other resins commonly used worldwide in OSB production. Physical properties such as the moisture content, thickness swelling, and water absorption, both after 2 and 24 hours of water immersion, and mechanical properties such as the modulus of elasticity and resistance in static bending, in major and minor axes, and internal bonding were investigated. All tests were performed according to European code EN 300:2006. Results showed the influence of wood species on physical and mechanical properties. Panels made with higher density woods such as Cambará presented better physical performance, while those made with lower density woods such as Pinus presented better mechanical properties. Besides that, strand particle geometry was also influenced on all physical and mechanical properties investigated. erefore, the feasibility of using alternative species and wood from first thinning and with castor oil-based polyurethane resin in OSB production was verified.

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Section: Methodsmentioning

confidence: 99%

Effect of Alternative Wood Species and First Thinning Wood on Oriented Strand Board Performance

Ferro

Souza

Araujo

et al. 2018

Advances in Materials Science and Engineering

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“…The modulus of elasticity to be calculated with the information from the testing model of Figure 2b is related to the idea of least squares (Equation 5) [6][7][8][9], aiming to determine the value of modulus of elasticity for the waste generated between the values of analytic (δ i (E)) and experimental (δ i ) displacements is minimized.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the Modulus of Elasticity in Damaged Wooden Beams

Christofóro¹,

Panzera²,

Silva³

et al. 2015

ijme

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This research aimed to employ two methods of calculation to obtain the bending modulus of elasticity in wooden specimens of Paricá (Shizolobium amazonicum), a simplified, adapted from the Brazilian standard ABNT NBR 7190, and another alternative based on the least squares method, in order to compare the efficiency of both. Therefore, some defects in wood specimens were created, based on the combination between the positions of the rips (damage) along the axis of the pieces (8.63, 17.25 and 25.86 cm) and their respective lengths (5, 10 and 15 mm), leading to a full factorial design of the type 3 2 , providing nine different combinations, apart from the reference condition (specimens without defects). The results of the confidence intervals revealed that the modulus of elasticity for both ways of calculation were equivalent for non-defective pieces, which did not occur with the inclusion of the defects in the specimens. In analysis of variance, the position, the length of the defects and the interaction between both proved to be not significant in the modulus of elasticity obtained from the methodology adapted from the Brazilian standard, which did not occur with the modulus of elasticity obtained from the least squares approach, proving to be more accurate than the simplified methodology, thus, emphasizing the importance of its use.

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“…Várias pesquisas referentes a fabricação e caracterização de painéis de partículas vem sendo realizadas no Brasil, podendo-se citar os trabalhos de Bertolini (2014); Varanda et al (2014); Iwakiri et al (2012); Alves et al (2014), entretanto, sendo poucos os estudos em que se foram investigadas as potencialidades de painéis para aplicações específicas na forma de pisos. DOI: dx.doi.org/10.18671/scifor.v44n112.21…”

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Painéis de partículas homogêneas fabricados com resíduos lignoceluósicos e resina alternativa para aplicação em pisos

Nascimento¹,

Lahr²,

Christofóro³

et al. 2016

Sci. For.

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ResumoOs painéis de partículas consistem em materiais compósitos com ampla gama de aplicações, dentre essas, na forma de pisos, em que a resistência à abrasão se configura como uma importante propriedade. Este trabalho objetivou investigar, com o auxílio da norma brasileira ABNT (2008), a resistência a abrasão (desgaste superficial) de painéis de partículas, fabricados com resíduos de madeira de Eucalyptus sp. para aplicação, na forma de pisos, em ambientes interiores. Os fatores investigados na fabricação dos painéis foram o tipo de resina (poliuretana a base de óleo de mamona; a ureia formaldeído), uso ou não de revestimento em verniz a base de poliéster e o número de ciclos para os ensaios de abrasão (1000; 1300; 1600), conduzindo a um planejamento fatorial completo com 12 tratamentos distintos. As respostas investigadas foram o desgaste por perda de massa, desgaste por perda de massa percentual, desgaste por perda de espessura e desgaste por perda de espessura percentual. Os resultados apresentaram valores de ciclos superiores às classes AC2 e AC3, chegando a 2700 ciclos, de acordo com a perda de massa. Da análise estatística, apenas o fator número de ciclos foi significativo nas propriedades investigadas, o que implica na equivalência de resultados para os demais fatores e interações investigadas. Palavras-chave: Painéis de partículas, resistência à abrasão, resinas. AbstractParticleboards consist of composite materials with a wide range of applications, among these, for floors, where abrasion is an important property. This research aimed to investigate, with the aid of the Brazilian standard ABNT (2008), abrasion resistance (surface wear) of particleboards manufactured with waste of Eucalyptus sp. wood for employment on indoor environments floors. The factors investigated in the manufacture of the panels were resin type (castor oil-based polyurethane resin, urea formaldehyde), the use or not of varnish coating based on polyester, and the number of cycles for the abrasion test (1000; 1300; 1600), leading to a full factorial design with 12 different treatments. The responses investigated were the wear mass loss, wear mass loss percentage, wear loss in thickness and wear loss percentage in thickness. The results showed higher number cycles values then AC2 and AC3 classes, reaching 2700 cycles according to the loss mass. In the statistical analysis, only the number of cycles factor was significant in the investigated properties, which implies equivalence results for the other factors and interactions evaluated.

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<b>Evaluation of modulus of elasticity in static bending of particleboards manufactured with <i>Eucalyptus grandis</i> wood and oat hulls

Cited by 10 publications

References 11 publications

Effect of Alternative Wood Species and First Thinning Wood on Oriented Strand Board Performance

Effect of Alternative Wood Species and First Thinning Wood on Oriented Strand Board Performance

Evaluation of the Modulus of Elasticity in Damaged Wooden Beams

Painéis de partículas homogêneas fabricados com resíduos lignoceluósicos e resina alternativa para aplicação em pisos

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