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Kinetic of cracks propagation related to the growth stress of clonal Eucalyptus wood

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Abstract

The growth stress released during felling trees of Eucalyptus sp. and after cutting into logs causes fissure and cracks propagation into the log sections. Evolution and velocity of cracks of woody discs of Eucalyptus grandis and E. camaldulensis clones were investigated. The first set of observations and measurements were taken in 2 h after discs crosscutting. All wood discs presented two cracks developed at opposite directions in the transversal plane RT. The discs of E. grandis have larger values for the length and velocity of cracks and energy liberated than those of E. camaldulensis discs. The second set of observations and measurements were done after 2 weeks of discs cutting. In each disc of E. grandis, the two cracks increased towards the periphery. A third crack was appeared in all discs of E. camaldulensis and extended in a perpendicular direction along the two previous cracks. The cracks size increased, and some of them reach the discs periphery with their side opening. In this stage, the wood discs of E. grandis present lower values for splitting indicators than those of E. camaldulensis wood. So, the good knowledge of the cracks evolution related to the growth stress may help us to take the suitable procedures to reduce their influence in this type of wood during cutting, storage and first transformation. In addition, by these findings completed by further researches, mathematical models can be developed in order to increase sawing yield and to avoid splits on woody boards.

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Acknowledgements

This work is supported by the Forest Research Center in Rabat (High Commission for Waters, Forests and Fight against Desertification) with a collaboration of Faculty of Sciences (Mohammed V University in Rabat), Morocco.

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Authors and Affiliations

  1. Laboratory of Condensed Matter and Interdisciplinary Sciences, Faculty of Sciences, Mohammed V University, Rabat, Morocco

    Mahyoub Amer, Bousselham Kabouchi & Salah El Alami

  2. Center of Plant and Microbial Biotechnologies, Biodiversity and Environment, Faculty of Sciences, Mohammed V University, Rabat, Morocco

    Mohamed Rahouti

  3. Physics and Mechanics of Wood Laboratory, Research Center of Forestry, Rabat, Morocco

    Abderrahim Famiri & Abdelwahed Fidah

  4. National Institute of Archeological Sciences and Patrimony, Rabat, Morocco

    Mohsine Ziani

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  1. Mahyoub Amer
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  2. Bousselham Kabouchi
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  3. Mohamed Rahouti
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  4. Abderrahim Famiri
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  5. Abdelwahed Fidah
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  6. Mohsine Ziani
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  7. Salah El Alami
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Correspondence to Mahyoub Amer.

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Amer, M., Kabouchi, B., Rahouti, M. et al. Kinetic of cracks propagation related to the growth stress of clonal Eucalyptus wood. J Indian Acad Wood Sci 16, 155–161 (2019). https://doi.org/10.1007/s13196-019-00242-z

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  • DOI: https://doi.org/10.1007/s13196-019-00242-z

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