Abstract
In this paper, an experimental analysis of the fracture parameters via the invariant J-integral for a cracked specimen made of wood is presented. The experimental test is realized using a sample made of Douglas fir loaded in opening mode. The sample geometry is a mix between the single edge notch and wedge splitting specimens, and the crack advances in the radial-longitudinal system, parallel to the wood rings. By using the optical mark tracking method, the displacement field evolution close to the crack tip is recorded during the test. The stress and strain fields are calculated using a finite element model generated from the experimental displacement fields. Further, the energy release rate is evaluated for different circular paths or crowns defined around the crack tip and for different loading values.
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Acknowledgments
Our sincere thanks are due to J. Cacault and Ing. H. M. Sebbah, who have contributed to and worked on the wood specimen and fixture systems preparation. Our sincere thanks are also due to the Photomechanics and Rheology team of Institut P’, who have contributed to marks tracking Deftac software development.
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Pop, O., Dubois, F. & Absi, J. J-integral evaluation in cracked wood specimen using the mark tracking method. Wood Sci Technol 47, 257–267 (2013). https://doi.org/10.1007/s00226-012-0488-5
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DOI: https://doi.org/10.1007/s00226-012-0488-5