Akademik Veri Yönetim Sistemi
STRENGTH OF MATERIALS, cilt.58, sa.1, ss.229-240, 2026 (SCI-Expanded, Scopus)
Physical and mechanical properties are important indicators of a material's utilization. In recent years, it has taken on an even more critical role as the use of wood in construction has increased. Solid wood is a natural material obtained from the forests. However, the naturalness gives heterogeneity and anisotropic behavior to the material. The differences in structure may arise from regional differences; they are generally identified by reference to anatomical features and can vary across tree species. Although many test standards specify the measurement direction, there is uncertainty about the impact of bending direction in some cases. Because most standards allow researchers to load in both radial and tangential directions, the direction wasn’t specified in many papers. However, since the annual ring direction changes the energy absorption, it has a characteristic that can significantly alter the impact bending. In this paper, the effect of loading direction, regional and subspecies differences on the impact bending strength of naturally grown Turkish black pine and Cilician fir was investigated. Totally, 6156 defect-free samples from two species, four subspecies, and 11 regions were used for this investigation. Results showed that, although all variables, impact-bending results were higher in the radial direction than in the tangential direction. When the species were compared, there were no significant differences in the radial direction, whereas black pine showed higher results in the tangential direction. It was thought that it could have arisen from the resin content of black pine. In addition, it was found that the results of some regions and subspecies were significantly different in both directions. For example, Abies cilicica from the Mersin region for fir and Pinus nigra from the Muğla region for black pine had the highest values. It is recommended that silvicultural factors and anatomical features be examined to identify the causes of the differences.