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Utilization of digital image correlation in determining of both longitudinal shear moduli of wood at single torsion test

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Abstract

A sophisticated approach for the precise determination of both longitudinal shear moduli of wood at single test is introduced. The method is based on the combination of the torsion test inducing pure shear stresses in sample and an optical method providing the full-field strain data of such stress state. The proposed procedure of the longitudinal shear moduli determination consists of two main steps. In the first step, the apparent longitudinal shear modulus following the standardized procedure (EN 408+A1) was determined. Secondly, both longitudinal shear moduli were derived based on the apparent longitudinal shear modulus and the shear strain distribution on the radial and tangential sample surfaces. The wood of European beech (Fagus sylvatica L.) was used as material for the experiments. The exploratory analysis revealed the increasing difference between the longitudinal shear moduli determined in the longitudinal–radial plane and in the longitudinal–tangential plane as the total torsion angle increased as well as with the increase in the average torsion stiffness. Further, the longitudinal shear moduli and the torsional longitudinal shear strength did not correlate well. Therefore, they cannot be used in order to predict each other. Although such findings need more detailed studies, they should be taken into account when designing wood structures.

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Acknowledgments

This work was funded by the Internal Grant Agency of Faculty of Forestry and Wood Technology at Mendel University in Brno (Grant No. 17/2015) and Ministry of Education, Youth and Sports of the Czech Republic (Grant No. 6215648902) and by the European Social Fund and the state budget of the Czech Republic, project “The Establishment of an International Research Team for the Development of New Wood-based Materials” Reg. No. CZ.1.07/2.3.00/20.0269. This work was also partly supported by the project VEGA 1/0395/16.

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  1. Department of Wood Science, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemědělská 3, 613 00, Brno, Czech Republic

    Martin Brabec, Jaromír Milch, Jan Tippner & Václav Sebera

  2. Department of Wood Science, Faculty of Wood Sciences and Technology, Technical University in Zvolen, 960 53, Zvolen, Slovakia

    Rastislav Lagaňa

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  1. Martin Brabec
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Correspondence to Martin Brabec.

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Brabec, M., Lagaňa, R., Milch, J. et al. Utilization of digital image correlation in determining of both longitudinal shear moduli of wood at single torsion test. Wood Sci Technol 51, 29–45 (2017). https://doi.org/10.1007/s00226-016-0848-7

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