Instrumented Impact Testing of Ceramics

概要

論文の詳細を見る
Many researches on ceramics have been reported, but brittleness is a key problem to be overcome. However, no generalized method on impact test of ceramics has been reported.<BR>The total absorbed energy evaluated from the Charpy impact test for brittle materials includes largely the energy absorbed by the machine and the kinetic one of the broken specimen, in addition to the real fracture one of the specimen. These energies, therefore, must be exactly analyzed and then the real fracture one is to be evaluated.<BR>In this study, the absorbed energy of partially stabilized zirconia (PSZ) and SiC is analyzed in the instrumented Charpy impact test and in the static three-point bend test. Moreover, the influence of stress-induced phase transformation on the toughness in PSZ is investigated.<BR>As a result, it is shown that the real fracture energy of PSZ is 57–59% of the total absorbed one and that the one of SiC is 38–56%. It is also shown that the amount of stress-induced phase transformation in the impact test is more than the one in the static three-point bend test. Furthermore, it is pointed out that a singularly oscillated loading is found in the impact test of PSZ, which is due probably to the co-working effect between the inertia effect and the stress-induced phase transformation during the dynamic fracture.
Japan Institute of Metalsの論文