Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 02, 2019 - November 04, 2019
In this study, shock-compression experiments have been performed to evaluate the shock-response characteristics of engineering ceramics which are Al2O3, Si3N4, and ZrO2. By shock-profile measurements using a laser velocity interferometer, it is confirmed that the shock wave which consists of elastic- and plastic- shock parts propagates into a specimen. The values of compression strength under shock-loading, which are named as Hugoniot Elastic Limit (HEL), for each material are determined from the amplitude of the elastic shock part. In the results of Si3N4, it is revealed that the stress wave following the plastic shock wave consists of ramp wave followed by steep shock wave. The formation of the ramp wave indicates the existence of non-crystalline intermediate phase between crystalline low pressure phase and crystalline high pressure phase, and the shock-compressed state of high-pressure phase is denser than the state obtained in previous study. By the comparison of this study with previous works, it is shown that the Al2O3 with fine grain structure have higher HEL and shock-deformation resistance than usual Al2O3 and the pores in ZrO2 cause a decrease in its shock impedance. These results clearly indicate that further understanding of microstructural effects is important to evaluate the shock-responses of engineering ceramics.
