Mechanical Behaviour of Nanostructured Materials at High Strain Rates. Computer Simulation

摘要

The new model of mechanical behaviour of nanostructured materials in wide range of strain rates is presented in the paper. The inelastic strains caused by the dislocation mechanisms, twinning, and grain boundary sliding have been taken into consideration. The model was used for computer simulation of the dynamics of shock waves in nanostructured materials. The results testify to distinctions of the mechanical behaviour of nanostructured and course grained materials under shock wave loading. The shear stress of nanostructured materials at high strain rates has been predicted to be less than ones of course-grained materials due to contributions to inelastic deformation caused by grain boundary sliding.