Effects of moisture content, grain orientation, and compressive strength on acoustic emission propagation in wood and a parameterised attenuation model

Le résumé fourni par la source

Acoustic emission (AE) monitoring has shown considerable potential for the non-destructive evaluation of timber structures; however, the AE propagation is strongly influenced by moisture content, grain angle, and compressive strength, thereby affecting the accuracy and reliability of AE-based monitoring. This study used Chinese fir, a widely used timber in Fujian province, as example to clarify the effects of propagation distance and grain angle on AE parameters under different moisture contents and compressive strengths. The experimental results revealed that for the duplicate moisture content or compressive strength, AE amplitude, energy, and frequency centroid exponentially decay with increasing in AE propagation distance. Moreover, AE amplitude significantly declines with an increase in grain angle. Finally, this study established attenuation models of AE parameters incorporating compressive strength, and provides recommendations the optimal AE sensor arrangement distance of 200–400 mm, thereby improving the applicability of AE techniques in health monitoring of timber structures.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.