Abstract
Particle velocity profiles of a TiB2 ceramics under one-dimension plate impact were measured up to 45 GPa. The Hugoniot-elastic limit of TiB2 was determined to be 8–9 GPa. Mechanical damage induced three-wave structures were only observed for shock stress above ∼31 GPa. TiB2 sustains large shear strength beyond the Hugoniot-elastic limit, which leads to the abnormal downward bending of Hugoniot in the plastic region.
Highlights
Ceramic materials have many excellent physical and chemistry properties, such as low density, high strength, high melting point, high chemical stability, and so on
Linear extrapolation of the Hugoniot data to Up = 0 corresponds to a shock velocity much bigger than the bulk sound velocity at ambient conditions.2,3. These characteristics suggest that a shock-induced phase transition may have happened, but both studies failed to find any evidence of a related three-wave structure
Kipp and Grady had measured the particle velocity profiles at TiB2/LiF interfaces with a velocity interferometer system for any reflector (VISAR); two cusps were observed in the measured wave profiles: one between 4.5 and 7.0 GPa and the other between 13 and 17 GPa, which they referred to as HEL1 and HEL2, respectively
Summary
Ceramic materials have many excellent physical and chemistry properties, such as low density, high strength, high melting point, high chemical stability, and so on. Linear extrapolation of the Hugoniot data to Up = 0 corresponds to a shock velocity much bigger than the bulk sound velocity at ambient conditions.2,3 These characteristics suggest that a shock-induced phase transition may have happened, but both studies failed to find any evidence of a related three-wave structure. Some research studies have been carried out on the dynamic properties of TiB2, a number of questions remain to be answered: (1) the HELs reported in the literature vary a lot, ranging from 5 to 15 GPa; (2) Zhang et al and Gust et al did not observe the three-wave structure that was observed by Kipp and Grady; and (3) the discontinuity of the Hugoniot did not get an appropriate explanation. Yielding property and shear strength of TiB2 under shock compression were discussed
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