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Journal of the Indian Academy of Wood Science

, Volume 16, Issue 2, pp 155–161 | Cite as

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

  • Mahyoub AmerEmail author
  • Bousselham Kabouchi
  • Mohamed Rahouti
  • Abderrahim Famiri
  • Abdelwahed Fidah
  • Mohsine Ziani
  • Salah El Alami
Original Article
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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.

Keywords

Clonal eucalyptus Wood Cracks propagation Energy liberation Splitting indicators Growth stress 
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Notes

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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Copyright information

© Indian Academy of Wood Science 2019

Authors and Affiliations

  • Mahyoub Amer
    • 1
    Email author
  • Bousselham Kabouchi
    • 1
  • Mohamed Rahouti
    • 2
  • Abderrahim Famiri
    • 3
  • Abdelwahed Fidah
    • 3
  • Mohsine Ziani
    • 4
  • Salah El Alami
    • 1
  1. 1.Laboratory of Condensed Matter and Interdisciplinary Sciences, Faculty of SciencesMohammed V UniversityRabatMorocco
  2. 2.Center of Plant and Microbial Biotechnologies, Biodiversity and Environment, Faculty of SciencesMohammed V UniversityRabatMorocco
  3. 3.Physics and Mechanics of Wood LaboratoryResearch Center of ForestryRabatMorocco
  4. 4.National Institute of Archeological Sciences and PatrimonyRabatMorocco

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