Akademik Veri Yönetim Sistemi
Drewno, cilt.68, sa.216, 2025 (SCI-Expanded, Scopus)
The elastic and shear moduli of Populus canadensis heartwood were measured, and the influence of annual ring width (ARW) on these moduli was determined. Differences between the heartwood and sapwood moduli were identified by comparing the results with reported data. The moduli were dynamically determined by ultrasonic testing and evaluation. Pressure (2.25 MHz) and shear (1 MHz) waves were propagated to obtain the transmission time, which was used to calculate the ultrasonic wave velocities and then the moduli. The average ARW and density were 2.48 cm and 381 kg/m3, respectively. The average elastic moduli in the longitudinal (EL), radial (ER), and tangential (ET) directions, and shear moduli in the LR (GLR), LT (GLT), and RT (GRT) planes were 4728 MPa, 1119 MPa, 407 MPa, 1102 MPa, 579 MPa, and 117 MPa, respectively. Neither good nor moderate relationships between ARW and the moduli were observed in linear regression analysis. According to literature reports, the modulus of elasticity decreases with increasing ARW. However, based on the comparison of reported values for sapwood with the results for heartwood obtained in this study, ER, GLR, and GRT increased with the increase in ARW. It should be noted that no relationship with ARW was found in the case of EL, ET, and GLT.