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A novel three-dimensional model for the prediction of ultrasonic velocity in wood considering its orthotropy

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Abstract

This paper deals with a three-dimensional model capable of determining the propagation velocities of ultrasound waves in wood. Considering simultaneously the three planes of orthotropy and using a spherical coordinate system, the mathematical expression of this model is proposed. The model is based on the two-dimensional Hankinson models commonly used for the characterization of velocities in each orthotropic plane. The model is composed of six (6) parameters. Three velocities in the main directions (VL, VR and VT) and three calibration coefficients (l, m and n) correspond to the three orthotropy planes. The experimental validation is based on ultrasonic measurements taken on a Douglas fir cube. A finite element support is used to recalculate the propagation velocities whatever the orientation of the propagation line by considering a cylindrical orthotropy induced by the construction of growth rings. The process of determining the model parameters (VL, VR, VT, l, m and n) by an inverse analysis algorithm is presented. The results show that the model improves the fit to the observed angular dependencies of the wave propagation velocities. The model predicts well the velocities outside the principal planes.

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Funding

This research received funding from the Nouvelle Aquitaine region and the French Ministry of Higher Education, Research, and Innovation.

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Conception, material preparation, data collection and finite elements modeling were performed by Jérôme Sonagnon Afoutou and Frédéric Dubois. The main manuscript was written by Jérôme Sonagnon Afoutou and Frédéric Dubois. All authors performed the analysis and approved the final version of the manuscript to be published.

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Correspondence to Frédéric Dubois.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Afoutou, J.S., Dubois, F., Sauvat, N. et al. A novel three-dimensional model for the prediction of ultrasonic velocity in wood considering its orthotropy. Wood Sci Technol 57, 605–623 (2023). https://doi.org/10.1007/s00226-023-01470-w

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  • DOI: https://doi.org/10.1007/s00226-023-01470-w

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