The purpose of this study is to clarify the effect of deformation during crack growth on the residual stress of sheared edges. By measuring the residual stress in the thickness direction of the sheared edge, the residual stress of the sheared edge on the scrap side was found to be larger than that on the product side. It was also found that this residual stress difference depends on the shearing clearance, and the difference becomes smaller with greater clearance. By experiments and numerical analysis, it was clarified that the difference in residual stress between the two sheared edges is due to the deformation caused by the Mode II growth of cracks. When the clearance is large, the growth of Mode I cracks increases and that of Mode II decreases, so it is considered that the stress difference between both edges becomes smaller.

A new three-dimensional printing using carbon-fiber-reinforced thermoplastic (CFRTP) tape has been developed. A thin CFRTP tape 0.6 mm wide and 0.18 mm thick is molten in the nozzle and drawn to the base material surface with compression by the head surface of the nozzle. Through this process, a thin layer 1.5 mm wide and 0.05 mm thick is adhered to the base material. Along the curved route in which the circumferences of the outside and inside circles are different, fibers cross over each other with no wrinkles with the same route length. In a lamination test on an eye-glass route with eight layers, defects in the lamination of a new layer were reduced by adding a hot compression ring around the nozzle head. Some future subjects were investigated for the development of a 3D printing using CFRTP.