13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- Figure 5. Fragmentation of initial grains: left picture – far from fracture surface, right picture – directly near the fracture surface. Projectile velocity 245 m/s 4. Conclusions Results of microstructure analysis of metallic samples (coarse-grained vanadium and typical polycrystalline iron) subjected to shock-wave loading of different intensity are presented and structure relaxation mechanisms taking place during such loading in two investigated materials are discussed. An important role of dynamic fragmentation in the case of iron samples was established. Obtained data will be used for quantitative analysis of structure changes under high-speed loading of different intensity. Acknowledgements The authors would like to acknowledge the Russian Foundation for Basic Research (grant RFBR 09-01-92005, grant RFBR 12-01-31504, grant RFBR 11-01-96010, grant RFBR 12-01-92002) for support of this work.
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