The present study investigates the influence of degradation effects due to natural aging of a pine wood by using acoustic birefringence measurements. In the present study, the acoustic anisotropy parameter for aged and un-aged Mexican pine (Pinus strobus) wood was calculated by the ultrasonic emission-transmission technique. The experimental measurements were carried out using a shear wave ultrasonic transducer with a central frequency of 0.5MHz. Ultrasonic velocity data and scanning electron microscopy (SEM) were performed, establishing a direct correlation with the shear wave velocity and the acoustic anisotropy parameter developed on the naturally aged and un-aged wood.
The wood elastic constants are of great importance in the design of structural elements. In particular, the elastic modulus in the longitudinal direction is often used for strength estimation and grading of wood. Ultrasonic techniques are commonly applied to determine elastic parameters in laboratory experiments and for condition assessment of existing wooden structures. In the present study, the elastic parameters (elastic modulus and shear modulus) for aged and un-aged Mexican pine (Pinus strobus) wood were measured by the ultrasonic emission-transmission technique. The experimental measurements were carried out using longitudinal and shear ultrasonic transducers with a central frequency of 1 MHz and 0.5 MHz respectively. Ultrasonic data and scanning electron microscopy (SEM) were performed, establishing a direct correlation with the measurements of the longitudinal and shear ultrasonic velocities and the elastic properties developed on the naturally aged and un-aged wood. Finally, the elastic and shear modulus of the wood before and after aging conditions were determinate. Therefore, the obtained experimental results not only contribute to the existing knowledge about aged wood but provide useful information about the possibilities of re-using wood as well.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.