Material properties and nondestructive evaluation of laminated veneer lumber (LVL) made from Pinus oocarpa and P. kesiya

Souza, Frederico de; Menezzi, Cláudio Henrique Soares Del; Júnior, Geraldo Bortoletto

doi:10.1007/s00107-010-0415-0

Cited by 41 publications

(25 citation statements)

References 14 publications

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“…Usually, dynamic properties overestimate static properties and this is drawback of the nondestructive evaluation. In all the treatments of this study, EMd According to Souza et al (2010) several studies have suggested that an increase in material continuity, i.e. a decrease in empty spaces, increases stress wave velocity of the board.…”

Section: Nondestructive Testingmentioning

confidence: 84%

“…When just stress wave velocity (wv) was used as a independent variable to predict f M and E M , both linear and non-linear models presented low R 2 values. Despite this finding, Souza et al (2010) found that stress wave velocity only might have potential to predict E M of LVL boards since a fitted model using this variable gave a coefficient of determination (R 2 ) of ca. 0.5.…”

Section: Nondestructive Testingmentioning

confidence: 90%

“…The time to reach this distance is displayed in the SWT device and used to calculate the stress wave velocity (wv). Wave velocity (wv) in addition to the material density and acceleration due to gravity were used to determinate the dynamic modulus of elasticity (EMd) according to Souza et al (2010) Initially, the results for each treatment were separately submitted to an overall analysis of variance (ANOVA) at 5% significance level in order to test between-board effects. Afterwards, between-treatment effects were analyzed by running again an ANOVA at 5% significance level.…”

Section: Board Manufacturing and Testingmentioning

confidence: 99%

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Lignocellulosic composites from brazilian giant bamboo (Guadua magna) Part 1: Properties of resin bonded particleboards

Arruda¹,

Menezzi²,

Teixeira³

et al. 2011

Maderas, Cienc. tecnol.

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This experiment evaluated the utilization of the recently identified Brazilian giant bamboo, Guadua magna (Londoño & Filg.) to manufacture medium density particleboard. Four board types were tested: two of them exclusively with particles of bamboo and two in a mixture of bamboo with Pinus taeda wood particles. The target density of the panels was 0.65 g/cm 3 for all treatments. The particleboards were bonded using 8% content of urea-formaldehyde (UF) and phenol-formaldehyde (PF) resins, based on dry weight mat. Mechanical, physical and nondestructive properties of the panels were assessed. The particleboards produced with PF showed better dimensional stability than UF particleboards. The addition of wood particles improved the mechanical properties of E M , f M and IB. The flexural properties of the panels (E M , f M ) could be modeled using either E Md or density and the models fitted presented high predictability (>66%).

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Section: Nondestructive Testingmentioning

confidence: 84%

Section: Nondestructive Testingmentioning

confidence: 90%

Section: Board Manufacturing and Testingmentioning

confidence: 99%

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Lignocellulosic composites from brazilian giant bamboo (Guadua magna) Part 1: Properties of resin bonded particleboards

Arruda¹,

Menezzi²,

Teixeira³

et al. 2011

Maderas, Cienc. tecnol.

View full text Add to dashboard Cite

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“…However, these irregularities are common in wood products, so NDE is also used to evaluate their effect on physical and mechanical properties. In spite of these irregularities, nondestructive methods have been used to evaluate the quality of several types of already consolidated wood-based composites such as oriented strandboard [2,3], wood-plastic composites [4], cement/gypsum bonded particleboard [5], bamboo particleboard [6], plywood [7], laminated veneer lumber [8] and oriented/laminated strand lumber [9]. However, the literature on NDE of wood-based materials remains relatively scarce, especially as regards engineered wood products made from tropical hardwoods.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nondestructive Evaluation of Veneers on the Properties of Laminated Veneer Lumber (LVL) from a Tropical Species

Menezzi

Mendes

Souza³

et al. 2013

Forests

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Abstract:This study aimed at evaluating the potential of Schizolobium parahyba to produce laminated veneer lumber (LVL) and the feasibility of a nondestructive method for grading the veneers. Initially, 64 S. parahyba veneers were nondestructively tested using the stress wave method, and stress wave velocity (wv) and veneer dynamic modulus of elasticity (E dV ) were determined. Afterwards, the veneers were graded according to E dV descending values and used to manufacture 8-ply LVL boards. After the manufacturing, the boards were also nondestructively tested, and the board dynamic modulus of elasticity (E dB ) was determined. Simple linear regression analysis was run to evaluate the relationship between the nondestructive and mechanical properties of veneers/boards. A positive effect of veneer stress wave properties on the LVL properties was found. Therefore, the higher the E dV values, the higher the LVL properties. The relationships between E dV and E dB properties were highly significant with all mechanical properties. It was clearly observed that when this grading procedure was used, the veneers were indirectly graded by their density. Finally, it could be concluded that S. parahyba showed good potential to produce LVL.

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“…The time to reach this distance is displayed in the SWT device and used to calculate the stress wave velocity (v o ). This unit (v 0 ) in addition to the materials density and acceleration due to gravity were used to determinate the dynamic modulus of elasticity (E d ) according to Souza et al (2011).…”

Section: Universidad Del Bío -Bíomentioning

confidence: 99%

Lignocellulosic composites from Brazilian giant bamboo (Guadua magna): Part 2: Properties of cement and gypsum bonded particleboards

Araújo¹,

Arruda²,

Menezzi³

et al. 2011

Maderas, Cienc. tecnol.

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In the first part of this study, the feasibility of manufacturing resin-bonded particleboard from the recently identified Brazilian giant bamboo (Guadua magna) was evaluated. In this second part, the main goal was to study the material properties of the cement and gypsum-composites made from that bamboo species. The effect of CaCl 2 addition in the physical and mechanical properties was also evaluated. Initially, the hydration test was performed to determine the inhibition index of the bamboo particles in the cement and gypsum setting. Three concentrations of CaCl 2 were used to produce bamboo cementbonded particleboards (BCBP): 0%, 2% and 4%. CaCl 2 was not added into bamboo gypsum-bonded particle boards (BGBP). Mechanical and physical properties were evaluated and nondestructive testing was performed as well. The inhibition index of Guadua magna in the cement or gypsum setting was classified as "low inhibition". The addition of CaCl 2 at bamboo-cement boards increased the internal bonding and reduced the water absorption. Other properties were not significantly affected. The bamboocement boards presented higher bending strength and lower moisture content than bamboo-gypsum boards.

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Material properties and nondestructive evaluation of laminated veneer lumber (LVL) made from Pinus oocarpa and P. kesiya

Cited by 41 publications

References 14 publications

Lignocellulosic composites from brazilian giant bamboo (Guadua magna) Part 1: Properties of resin bonded particleboards

Lignocellulosic composites from brazilian giant bamboo (Guadua magna) Part 1: Properties of resin bonded particleboards

Effect of Nondestructive Evaluation of Veneers on the Properties of Laminated Veneer Lumber (LVL) from a Tropical Species

Lignocellulosic composites from Brazilian giant bamboo (Guadua magna): Part 2: Properties of cement and gypsum bonded particleboards

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