Mechanical and Microstructural Aspects of Material Failure due to Localized Shear under High-Rate Loading Conditions

摘要

The paper focuses on the experimental and theoretical study of instability of plastic strain and its localization in materials subjected to high-velocity perforation. The online study of the specimen surface was made using the highspeed infrared camera CEDIP Silver 450M. The distribution of the temperature field obtained at different instants of time allows getting insight into the evolution of the process of plastic strain localization. After testing, the structure of the specimen material was examined by scanning electron microscopy. In our investigation, the mechanisms of plastic shear instability and localization of plastic strain (in the three-dimensional statement) have been simulated numerically, and the peculiarities of the kinetics of microshear accumulation in the material have been analyzed.