Measurement of particle size from dynamic fragmentation of aluminum at superhigh strain rate

Dynamic fragmentation of material under superhigh strain rate is a topic of increasing interest in shock physics. However, due to diagnosis technique limits, high-quality experimental data of particle size of the fragmentation are quite sparse. Recently, based on in-line holography, we have explored a technique to diagnose the dynamic fragmentation process and measure particle size of fragmentation. Using this diagnosis system, an experiment of laser-shock-melted aluminum has been successfully performed, in-situ data of fragment particles have been obtained in melted aluminum for strain rate ranging from 107～108/s, which gives confidence to our measurement technique for dynamic fragments with high precision.