| Summary: | The shock response of the TiB2-B4C composite has been studied by experimental and theoretical analysis. The plate impact experiments and the Doppler pin test system (DPS) were used to collect the free surface velocity of sample. Results showed that regular grain of TiB2 was distributed uniformly in the grown grain of B4C. The intergranular fracture was mainly occurred along the grain boundary of the TiB2 phase, while the transcrystalline fracture was mainly happened within the B4C particles. The free surface history of the composite showed that Hugoniot elastic limit (HEL) of the TiB2-B4C composite was 16.09 GPa. The analytical models of failure wave propagation were established when the delayed effect of crack propagation was ignored and considered respectively. It can be concluded that the failure wave velocity of the composite was increased from 0.67C0 to 0.69 C0 at the shock pressure of 5.46–12.17 GPa, and attenuated with the propagation distance. The delayed effect had a great effect on the failure wave propagation, which were increased with shock pressure, and decreased with propagation distance. Keywords: Failure wave, TiB2-B4C composite, Propagation characteristic, Delayed effect, Plate impact experiment
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