Japanese hairdressing scissors are highly regarded around the world. However, the cutting process is unknown. In this study, we attempted to clarify this process by observing the cross sections of a copper wire after cutting. We found that there are three different surfaces on the cross section. The first surface is made by the inside of the scissors blade edge. The second surface is located opposite to the first one. This surface is created by another side of the blade edge that forms the first surface. The third surface created by shear fracture exists between these two surfaces. During cutting, the cutting position is closer to the tip of the blade than the point where blades touch each other. Therefore, there is a crossover distance K between the tips of two edges. If K is sufficiently large, cutting will be completed. When cutting conditions become more stringent, two blades are pushed apart during cutting. At this time, if K becomes very small, cutting will not be completed. Thus, K is important for cutting. Moreover, we showed the relationship between the cutting position and K, and presented a calculation method.

To evaluate the bending properties of Al-Cu alloy of A2024 in different heat treatments, the relationships between crystallographic orientations and microstructures were examined, along with bending. A bending apparatus was used to examine the bending angles of each material at intervals of 10° from 180° to 130° for (ii) T3 (temper symbol), (iv) T4, and (v) T6, and from 180° to 100° for (i) O and (iii) laser-irradiated T3 specimens. Bending tests were conducted by field emission scanning electron microscope (FE-SEM) while observing the associated behaviors. The texture distribution in an aluminum alloy specimen was analyzed using orientation imaging microscopy (OIM) software. The analytical results related to inverse pole figure (IPF) maps, kernel average misorientation (KAM) maps, and the Taylor factor distribution were obtained by electron backscatter diffraction (EBSD) analysis. Results demonstrate that the bending ability of the specimen depends on the KAM 1.75 degree.