On the inverse identification of wood elastic properties using a DIC-based FEMU approach
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 18 October 2022
Issue publication date: 8 February 2023
Abstract
Purpose
This work aims to identify the linear elastic orthotropic material paramters of Pinus pinaster Ait. wood, using full-field measurements and an inverse identification strategy based on the finite element (FE) method updating technique.
Design/methodology/approach
Compression tests are carried out under uniaxial and quasi-static loading conditions on wood specimens oriented on the radial-tangential (RT) plane, with different grain orientations. Full-field displacements and strains are measured using digital image correlation (DIC), which are then used as a reference in the identification procedure. A FE model is implemented assuming plane stress conditions, where wood is modelled as an orthotropic homogeneous material. Based on the numerical results, a synthetic image reconstruction scheme is implemented to synthetically deform the reference experimental image, which is then processed by DIC and further compared to the experimental results.
Findings
The results for both approaches were similar when both specimen configurations were used in a single run. However, when using the DIC-based FEMU approach with the on-axis configuration, the identified modulus of elasticity in the tangential direction and shear modulus are closer to the reference values.
Originality/value
This approach ensures a fair comparison between both sets of data since the full-field strain maps are obtained through the same filter and therefore have the same strain formulation, spatial resolution and data filtering. Firstly, the identification is performed using a single configuration, either the on-axis or the off-axis specimen. Secondly, the identification is carried out by merging data from both on-axis and off-axis configurations.
Keywords
Acknowledgements
J. Henriques is grateful to the FCT for the PhD grant 2021.05692.BD. This project has received funding from the Research Fund for Coal and Steel under grant agreement No 888153. The authors gratefully acknowledge the financial support of the Portuguese Foundation for Science and Technology (FCT) under the project PTDC/EMEAPL/29713/2017 by UE/FEDER through the programs CENTRO 2020 and COMPETE 2020, and UID/EMS/00481/2013-FCT under CENTRO-01–0145-FEDER-022083. Authors also acknowledge Fundação para a Ciência e a Tecnologia (FCT - MCTES) for its financial support via the projects UIDB/00667/2020 (UNIDEMI).
Citation
Henriques, J., Xavier, J. and Andrade-Campos, A. (2023), "On the inverse identification of wood elastic properties using a DIC-based FEMU approach", International Journal of Structural Integrity, Vol. 14 No. 1, pp. 74-90. https://doi.org/10.1108/IJSI-04-2022-0063
Publisher
:Emerald Publishing Limited
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