Nondestructive evaluation of heat-treated Eucalyptus grandis Hill ex Maiden wood using stress wave method

Nondestructive evaluation of heat-treated Eucalyptus grandis Hill ex Maiden wood using stress wave method

The objectives of this study were to evaluate the effect of heat treatment of eucalypt wood (Eucalyptus grandis Hill ex Maiden) on the dynamic modulus of elasticity by using the stress wave nondestructive method and also to determine the air-dry density variation, weight loss and equilibrium moistur...

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Bibliographic Details
Published in:Wood science and technology Vol. 46; no. 1-3; pp. 41 - 52
Main Authors: Garcia, Rosilei A, de Carvalho, Alexandre Monteiro, de Figueiredo Latorraca, João Vicente, de Matos, Jorge Luis Monteiro, Santos, Wanessa A, de Medeiros Silva, Rafael Fonseca
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer-Verlag 2012
Springer Nature B.V
Subjects:
Air temperature
Biomedical and Life Sciences
Ceramics
Composites
Dry density
Eucalyptus
Eucalyptus grandis
Glass
Heat treating
Heat treatment
Heat treatments
Life Sciences
Machines
Manufacturing
modulus of elasticity
Moisture content
Natural Materials
Nondestructive testing
Original
Processes
Storage modulus
Stress waves
temperature
Water content
Weight loss
wood
Wood Science & Technology
Dynamic Modulus
Eucalyptus
Initial Moisture Content
Equilibrium Moisture Content
Stress Wave
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Summary:The objectives of this study were to evaluate the effect of heat treatment of eucalypt wood (Eucalyptus grandis Hill ex Maiden) on the dynamic modulus of elasticity by using the stress wave nondestructive method and also to determine the air-dry density variation, weight loss and equilibrium moisture content following treatment. Heat treatments were performed at four different temperatures (180, 200, 215 and 230°C) and for three different durations (15 min, 2 and 4 h). The results revealed a significant reduction in air-dry density following heat treatment independent of temperature and time. A significant weight loss was observed between and within treatments. The treatment at 230°C for 2 and 4 h produced a weight loss of 20.5 and 26.5%, respectively, which was statistically different from other treatment conditions. The dynamic modulus of elasticity decreased by about 13% in the most severe treatment (230°C for 4 h). Depending on the temperature and time, the equilibrium moisture content was significantly reduced within the range of 40–74%.
Bibliography:http://dx.doi.org/10.1007/s00226-010-0387-6
ISSN:0043-7719
1432-5225
DOI:10.1007/s00226-010-0387-6