Abstract
The present study aimed to estimate the modulus of elasticity (MOE) at static bending of Rose gum (Eucalyptus grandis) heartwood and sapwood through two nondestructive techniques: ultrasound and stress wave. Sixty samples of heartwood and sapwood were prepared. Nondestructive tests were performed using ultrasound and stress wave timer equipment, while destructive tests were carried out in a universal machine through static bending tests. The main results showed that the heartwood presented better behavior than the sapwood in the non-destructive tests. However, the best model was obtained considering both wood types through the ultrasonic technique. Therefore, stress wave and ultrasonic techniques could be employed to estimate the modulus of elasticity of Rose gum wood.
Highlights
Nondestructive materials evaluation is the science of identifying physico-mechanical properties of a piece of material without modifying its characteristics and final application, using this information to make decisions regarding its applications (Ross et al, 1998)
The present study aimed to estimate the modulus of elasticity (MOE) at static bending of Rose gum (Eucalyptus grandis) heartwood and sapwood through two nondestructive techniques: ultrasound and stress wave
The present study aimed to predict the modulus of elasticity at static bending through ultrasound and stress wave techniques
Summary
Nondestructive materials evaluation is the science of identifying physico-mechanical properties of a piece of material without modifying its characteristics and final application, using this information to make decisions regarding its applications (Ross et al, 1998). Stress wave presents better propagation on wood with high sonorous quality than on decayed wood This technique is employed in order to analyse wood pieces, besides evaluating the internal conditions of trees by measuring the propagation time in radial direction (Wang et al, 2004). The material analyzed is not affected by the phenomenon of propagation; the samples could be tested many times without deformation and could be evaluated in service (Oliveira et al, 2002) These techniques enable wood maintenance through mapping of decayed areas without the need to remove parts of the structure. In this context, the present study aimed to predict the modulus of elasticity at static bending through ultrasound and stress wave techniques
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