Shearing characteristics in ultrasonic vibration-assisted piercing of fine-grained stainless steel foils

Abstract A novel ultrasonic vibration-assisted piercing system was developed. To clarify the effect of ultrasonic vibration on fine-grained stainless steel SUS304 foils, experiments were conducted under different amplitudes (0, 2.3 and 3.2 µm) and grain sizes (9.0 and 1.5 µm). With this method, as the amplitudes of ultrasonic vibration increased, the shearing load tended to decrease. Furthermore, the results of load reductions with applying ultrasonic vibration indicated that maximum load reductions at grain sizes of 9.0 and 1.5 µm were 13.3 and 60%, respectively. The effect of ultrasonic vibration on fine-grained materials was experimentally demonstrated.