Akademik Veri Yönetim Sistemi
2016 World Conference on Timber Engineering, WCTE 2016, Vienna, Avusturya, 22 - 25 Ağustos 2016, (Tam Metin Bildiri)
This study investigates elastic constants of Anatolian black pine (Pinus nigra Arn. subsp. pallasiana (Lamb.) Holmboe) by means of ultrasonic waves. Three Young's modulus, three shear modulus and six Poisson ratios were determined at constant moisture content. Three longitudinal and six shear wave velocities propagating along the principal axes of anisotropy, and additionally, three quasi-shear wave velocities at 45° angle with respect to the principal axes of anisotropy were measured using EPOCH 650 ultrasonic flaw detector. The measured average wave velocities for the sapwood in L, R, T directions were 4454, 1982 and 1036 m/s, respectively. The predicted average modulus of elasticity values in L, R, T directions were 8765, 1339 and 374 N/mm2, respectively. Poisson ratios varied between 0.033 and 0.93. Shear modulus calculated from shear waves in LR, LT and RT planes were 743, 527 and 159 N/mm2, respectively. Compression test are also being conducted in order to determine elastic constants. Comparing with calculated values, the predicted Young's modulus in the principle directions are similar. The average shear modulus calculated from compression tests in LR planes is 786 N/mm2. Poisson ratios seem to be acceptable although there are higher differences. Preliminary results indicate that ultrasound can be used in determination of elastic constants for black pine.