Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 09, 2018 - September 12, 2018
When ultrasonic vibration is applied, the yield stress reduction phenomenon (Blaha effect) occurs. However, it has not been put into practical use. In this study, it was aimed for application to the elucidation of the principle of the Blaha effect and supersonic plasticity processing. We tried to elucidate the optimum deformation condition of the compression test by applying ultrasonic wave. There are four main conclusions from this study. Ultrasonic vibration is applied during compression test. Then, the deformation resistance of the material decreases to be equal to or greater than the value of the applied vibration stress. Softening of material by ultrasonic irradiation is very short. The larger the inherent acoustic impedance of the vibration disc, the greater the influence on the ultrasonic vibration compression test. The thinner the thickness of the object to be transmitted, the less the loss of ultrasound. Therefore, the influence of Blaha effect becomes large.
