The conventional shearing of amorphous alloy foil induced significant damage in them because of their high strength and low ductility. New shearing tools with a tailored chamfer at the punch cutting edge were proposed. The chamfer size was varied to describe its effect on the shearing behavior. Without chamfers, chipping occurred at the punch cutting edge after only 100 shots. No chipping was observed even after 1000 shots when using the chamfered punch, irrespective of the chamfer size. In particular, when the chamfer size was reduced to 10 μm, no chipping occurred, and the punch cutting edge was only slightly worn even after 50,000 repetitions of piercing the five-laminate amorphous alloy foil stack. This well-conditioned punch cutting edge resulted in the formation of high-quality pierced holes.
The local heat bending of CFRTP pipes fabricated by laminating unidirectional fiber sheets was investigated. In the sheet with an axial fiber direction, fibers were separated at the same length and width using a cutting plotter. Laminated sheets were heated and pressed with silicone rubber onto an inside wall of a steel pipe to fabricate a consolidated pipe. Local heat bending was carried out by bending with a tension tool. A CFRTP pipe of 31 mm diameter was bent to a 50 mm curvature radius at the inside corner. The coefficient of elongation of the outside corner was 0.6. The strength of the elongated cut-fiber sheet was investigated to maintain the strength of the bent pipe. The material structure and rigidity after the bending were examined. Improvements for the local heat bending of CFRTP pipes were summarized.