Sıcaklık ve Maruz Kalma Süresinin Meşe Odunu Eğilme Özelliklerine Etkisi

Abstract

Temperature is one of the environmental factors that has influences on the material properties, and its behavior in service life. In this study, effects of temperature and exposure duration on the ultrasound wave velocity, dynamic Modulus of Elasticity, Modulus of Elasticity in bending, and Modulus of Rupture were figured out by the transmission of ultrasound longitudinal wave and three points bending tests. According to results, all determined properties were decreased at intensive treatment conditions. Maximum decreases were 4.7, 16.6, 20.7, 34.1, and 8.7 % at 210 °C 8 h treatments for VLL, Edyn, MOE, MOR, and density, respectively. However, at moderate temperatures up-to 150 °C, properties (except density) were increased (VLL: 12.7%, Edyn: 20.2%, MOE: 18.1%, MOR: 11.7% at 80°C for 8h) with the increase in exposure time within the groups but decreased between the groups. Pearson correlation coefficients between the variables were ranged from 0.71 to 0.93 for Edyn-MOE, 0.47 to 0.85 for Edyn-MOR, 0.02 to 0.75 for Edyn-VLL, 0.71 to 0.88 for MOE-MOR, 0.02 to 0.78 for MOE-VLL, and 0.01 to 0.81 for MOR-VLL. Furthermore, R2 values were ranged from 0.7 to 0.9.