STUDY OF BRAZILIAN COMMERCIAL ORIENTED STRAND BOARD PANELS USING STRESS WAVE

ABSTRACT Today lumber industry has shown a clearly evident trend towards wood based panels’ production; and, among them, Oriented Strand Board (OSB) has become more and more prominent. Nondestructive Testing (NDT) such as stress wave is one of the possible ways to make their mechanical characterization. This study aimed to investigate the efficiency of NDT stress wave to estimate mechanical parameters of Brazilian commercial OSB panels. National commercial OSB panels (15 and 25 mm in thickness) were tested by standard methods, EN codes, and non-destructive tests employing Stress Wave Timer, METRIGUARD, model 239 A. Data obtained in tests were analyzed using mean comparison by analysis of variance (ANOVA) and Tukey method. R² values greater than those established by EN 326-2 2002 to determine correlation between mechanical properties in bending (f m and E m ), obtained by the standard and non-destructive testing, suggest the possibility of using stress wave for quality control in OSB industry. KEYWORDS: Oriented strand board, nondestructive testing, stress wave, static mechanical properties.

[1]  D. Teixeira,et al.  Lignocellulosic composites from brazilian giant bamboo (Guadua magna) Part 1: Properties of resin bonded particleboards , 2011 .

[2]  D. Teixeira,et al.  Lignocellulosic composites from brazilian giant bamboo (Guadua Magna). Part 2: properties of cement and gypsum bonded particleboards , 2011 .

[3]  C. Menezzi,et al.  Avaliação não-destrutiva de painéis OSB modificados termicamente : parte 1- efeito do tratamento térmico sobre a velocidade de propagação de ondas de tensão , 2007 .

[4]  Qinglin Wu,et al.  Stress-wave velocity of wood-based panels: Effect of moisture, product type, and material direction , 2006 .

[5]  C. D. Del Menezzi,et al.  Material properties and nondestructive evaluation of laminated veneer lumber (LVL) made from Pinus oocarpa and P. kesiya , 2011, European Journal of Wood and Wood Products.

[6]  S. Nielsen.  Determination of Moisture Content , 2010 .

[7]  Yu Liu,et al.  Non-destructive testing of wood composites based on virtual instrument , 2010, 2010 3rd International Congress on Image and Signal Processing.

[8]  Jiang Xiao,et al.  Nondestructive testing of dynamic elasticmodulus of wood-basedpanel by the method of stress wave , 2009, 2009 9th International Conference on Electronic Measurement & Instruments.

[9]  Robert J. Ross,et al.  Relationship between stress wave velocities of green and dry veneer , 2004 .

[10]  Robert J. Ross,et al.  Nondestructive evaluation of wood , 1994 .

[11]  Robert J. Ross,et al.  NDE of wood-based composites with longitudinal stress waves , 1988 .