| 초록 |
The relationship between macroscopic chip type and microscopic crack behavior when cutting parallel to the grain in Cryptomeria japonica was investigated. The macroscopic chip type, when cut at a medium cutting angle with 50°, changed shape from flow type to split type as the depth of cut increased. The appearance of a ldquo;preceding crack rdquo; occurred in more than the fixed depth of cut. Cracks of the intercellular layer and the radial wall of the lumen on the microscopic level were observed in the early stage of macroscopic chip formation. Microscopic slant and vertical ruptures were also observed across several cells at the final stage of chip formation. From these results, it was concluded that the intercellular layer cracks in the microscopic crack behavior grew up mainly to the ldquo;preceding crack rdquo; when a split-type chip was cut at the medium-sized cutting angle. |
