NDT of structural timber members by means of 3D ultrasonic imaging techniques and modelling

Abstract

The present paper describes the development and first application of ultrasonic imaging of timber (wood) by means of reconstruction calculation (3D-SAFT; Synthetic Aperture Focusing Technique). It considers the highly aniso-tropic ultrasonic velocity on wood. In order to validate such techniques we report on experiments carried out on test specimens made from pine and beech. Those specimens differ for the orientations of the annual rings. For the reconstruction calculation the slowness curves of the material are considered applying the elastic constants known from the literature. The anisotropic SAFT reconstruction is calculated from measured datasets and from synthetic data resulting from EFIT modelling (EFIT: Elastodynamic Finite Integration Technique). © RILEM 2013.