Personne :
Beck, Katherina

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Beck
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Katherina
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Département de sciences du bois et de la forêt, Faculté de foresterie, de géographie et de géomatique, Université Laval
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ncf11858605
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Auteur: Salenikovich, Alexander × Sujet: Bois -- Propriétés mécaniques ×

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  • Publication
    Restreint
    Comparison of mechanical properties of oriented strand board made from trembling aspen and paper birch
    (Springer, 2009-05-30) Beck, Katherina; Cloutier, Alain; Salenikovich, Alexander; Beauregard L., Robert
    This study compared the performance of oriented strand boards (OSB) made from trembling aspen, a low-density hardwood species, and OSB made from paper birch, a medium-density hardwood species. The birch strands were thinner than the aspen strands to ensure a comparable specific surface. Three levels of adhesive content were used: 3.5%, 5.0%, and 7.0%. Internal bond (IB) and modulus of elasticity (MOE) and modulus of rupture (MOR) for flatwise and edgewise bending were determined. Both species performed equally well in IB (3.5% adhesive content: 0.46 MPa, 5.0%: 0.60 MPa, and 7.0%: 0.65 MPa). The values of MOE in flatwise bending were slightly lower for birch than for aspen panels (11.8 GPa for aspen and 10.6 GPa for birch), and the MOR values were not significantly different (combined 68.3 MPa). Edgewise bending properties were not significantly different for the two species with a MOE of 10.5 GPa and a MOR of 43.2 MPa.
  • Publication
    Accès libre
    Effect of strand geometry and wood species on strandboard mechanical properties
    (Society of Wood Science and Technology], 2009-07-01) Beck, Katherina; Cloutier, Alain; Salenikovich, Alexander; Beauregard L., Robert
    This study compared the performance of strandboards made from trembling aspen, a lowdensity hardwood species, with strandboards made from paper birch, a medium-density hardwood species. Strands were cut into three different lengths (78, 105, and 142 mm) and two thicknesses (0.55 and 0.75 mm) to compare the impact of species, strand geometry, specific surface, and slenderness ratio. Internal bond (IB), modulus of elasticity (MOE), and modulus of rupture (MOR) for flatwise and edgewise bending, compressive strength, and stiffness were all determined. Both species performed equally well in IB (0.73 MPa for both species combined). The highest MOE and MOR values in flatwise and edgewise bending were obtained for long, thin strands and were significantly lower for birch than for aspen panels (flatwise: 13.6 GPa and 99.2 MPa for aspen and 12.1 GPa and 85.5 MPa for birch; edgewise: 13.5 GPa and 66.3 MPa for aspen and 13.2 GPa and 65.7 MPa for birch). Short aspen strands resulted in the highest compressive properties, slightly higher than those of short birch strands (aspen: compressive strength 10.4 MPa and stiffness 1.22 GPa; birch: 10.8 MPa and 2.25 GPa, respectively). Strand length must therefore be a compromise between the need for high bending properties provided by long strands and the need for high compressive properties provided by short strands.