Personne : Salenikovich, Alexander
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Université Laval. Département des sciences du bois et de la forêt
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- PublicationAccès libreMechanical performance of polyurethane and epoxy adhesives in connections with glued-in rods at elevated temperatures(Dept. of Wood and Paper Science, College of Natural Resources, North Carolina State University, 2016-10-09) Verdet, Mathieu; Galimard, Philippe; Cointe, Alain; Salenikovich, Alexander; Coureau, Jean-Luc; Muñoz Toro, Williams Manuel; Blanchet, Pierre; Delisée, ChristineGlued-in rods have succesfully been used for connections of reinforcement of timber structures due to their high strenght and stiffness. However, their performance is potentially sensitive to temperature. This paper deals with an experimental investigation of the connections and adhesives in elevated temperatures. First, dynamic mechanical analysis (DMA) tests were performedto characterize an epoxy (EPX) and a polyurethane (PUR) adhesive. The evolution of the stiffness and the glass transition temperature, Tg, were measured in the range of 30°C to 120°C. Then, a total of 66 specimens with glued-in rods and the same adhesives were tested under a static tensile load at 20°C, 40°C, 50°C, 60°C, and 70°C. In both types of tests, the EPX outperformed PUR due to its higer stiffness at temperatures of up tu 40°C; however, it showed a more rapid degradation of the stiffness and strenght than the PUR at higher temperatures. No direct correlation was established between the Tg and the performance of the connections. The test results suggest that timber structures with glued-in rods may be vulnerable in service at temperatures above 40°C.
- PublicationRestreintProduction and properties of wood-welded panels made from two Canadian hardwoods(International Academy of Wood Science, 2013-05-18) Cloutier, Alain; Salenikovich, Alexander; Blanchet, Pierre; Stevanovic-Janezic, TatjanaThis study examines the suitability of wood welding technology for producing composite panels for furniture applications with two Canadian hardwood species, sugar maple (Acer saccharum) and yellow birch (Betula alleghaniensis). For each species, twelve 30 9 225 9 300 mm3 panels were manufactured using a panelling machine specifically designed for rotational wood-dowel welding with optimized parameters obtained from a previous study. Six edge-glued panels of the same size were manufactured from each species using a non-structural polyvinyl acetate adhesive and tested for comparative purposes. The experimental programme included three-point bending at 255-mm span and visual inspection of the panels to assess performance at standard moisture conditions and after an ageing cycle with variable relative humidity. Average breaking load of 1.79 and 1.70 kN was obtained at standard moisture conditions for welded panels of yellow birch and sugar maple, respectively. Fractures consistently occurred in the dowel’s cross section, whereas no slippage was observed along the welded interface. Delamination between wood slats occurred after the ageing cycle, but did not affect the bending properties. Results confirm the suitability of wood-dowel welding for producing furniture panelling with Canadian hardwood species. Further research is needed to design panels with a more efficient position and use of welded dowels and with panel product properties that are comparable or superior to those of glued counterparts.
- PublicationAccès libreEffect 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., RobertThis 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.
- PublicationRestreintComparison 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., RobertThis 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.
- PublicationRestreintDevelopment of a new engineered wood product for structural applications made from trembling aspen and paper birch(Forest Products Research Society, 2009-07-31) Beck, Katherina; Cloutier, Alain; Salenikovich, Alexander; Beauregard L., RobertThis study compared the bending performance of small (30 mm [1.2 in.] deep) laminated beams made from aspen oriented strand lumber (OSL), birch OSL, and commercial web-stock oriented strandboard (OSB) panels. Aspen OSL beams had an average modulus of elasticity (MOE) of 9.89 GPa (1.43 × 10^sup 6^ psi) and an average modulus of rupture (MOR) of 52.0 MPa (7.54 × 10^sup 3^ psi). The average MOE for birch OSL was 10.6 GPa (1.54 × 10^sup 6^ psi), and the average MOR was 58.4 MPa (8.47 × 10^sup 3^ psi). OSB laminated beams reached less than half of these values (5.17 GPa [0.75 × 10^sup 6^ psi] and 26.4 MPa [3.83 × 10^sup 3^ psi], respectively). Large (120 mm [4.72 in.] deep) laminated OSB beams were also tested to track the depth effect. The average MOR of aspen and birch OSL, adjusted to 120 mm depth, was estimated to be 46.7 MPa (6.77 × 10^sup 3^ psi) and 52.6 MPa (7.63 × 10^sup 3^ psi), respectively. Comparisons with laminated strand lumber products currently on the Canadian market showed the mechanical properties of this new product to be competitive