Abstract
When using wood and wood-based composites, it is necessary to determine the elastic constants of these engineered materials. Oriented strand board (OSB), as structural wood based panel, plays a significant role in the building sector, but the accessibility of such elastic constants of OSB is mostly limited. For this purpose, this study aimed at determining the elastic wave velocity, stiffness and all elastic constants of OSB made from Poplar (Populus deltoides) strands using ultrasonic through–transmission technique. Laboratory OSBs with the mean density of 760 kg/m3 were made with the average strand sizes of 0.6 mm in thickness, 120 mm in length and 30 mm in width. 8 % phenol-formaldehyde (PF) resin was used with the pressing conditions of 3.43 N/mm2, 190 °C and 600 s as pressure, temperature and time of pressing, respectively. The OSBs were assumed as an orthotropic model. Three modulus of elasticity (E1, E2, and E3), three shear modulus (G12, G13 and G23), and six Poisson’s ratios (v12, v21, v13, v31, v23, v32) were calculated by longitudinal, transversal and quasi-transversal waves velocities. Ultrasonically determined stiffness coefficients of OSB were investigated by representative volume elements (RVE). Therefore, the separation of scales requirement is satisfied, and the measured velocities can be applied to determine the engineering elastic parameters of the examined OSB. The results indicate that modulus of elasticity and shear modulus are in the same order of magnitude in comparison with other references, and the values of Poisson’s ratios are valid in ultrasonic range measurement. In conclusion, the ultrasonic contact pulse transmission shows great potential to determine the characterization of elastic wave velocity, stiffness and engineering elastic parameters.
Highlights
This study aimed at determining the elastic wave velocity, stiffness and all elastic constants of Oriented strand board (OSB) made from Poplar (Populus deltoides) strands using ultrasonic through–transmission technique
With taking into account the limitations in availability of elastic constants of OSB, the aim of this study was to characterize elastic wave velocity, stiffness and anisotropic behavior, and to provide all elastic constants of OSB made from Poplar (Populus deltoides) strands by means of ultrasonic waves
Engineering elastic parameters of OSB made from Poplar were studied using ultrasonic contact pulse transmission
Summary
It is used in different applications such as furniture, reels, pallets and boxes, trailer liners and recreational vehicle flooring (Smulski, 1997; Hiziroglu, 2006). With increasing applications of OSB, the determination of its mechanical properties is critical for ensuring reliable performance. Elastic constants of OSB are of substantial importance to both science and technology as they describe the mechanical behavior of materials but are significant for purposes of engineering design. Engineering constants are required as input parameters for modern numerical simulation methods such as finite element method (FEM), which is often used in mechanics of engineered materials and civil engineering (Goncalves et al, 2014). Determination of the full set of elastic engineering parameters, including three modulus of elasticity (E1, E2 and E3), three shear modulus (G , G and G ), and six Poisson’s
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