Fracture Mechanisms Caused by Shock-Induced Microtwinning.
Final rept. Jul 72-Jun 73,
RUTGERS - THE STATE UNIV NEW BRUNSWICK N J BUREAU OF ENGINEERING RESEARCH
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The shock-induced microstructure of copper was investigated in order to determine the relationship of this substructure to failure. Three substructural modifications were found subsequent to shock-loading microtwinned regions, cellular dislocation substructure, and fine internal porosity. The morphology of the twinned regions depended upon crystallographic orientation relative to the shock axis. The average dislocation cell size increased with decreasing shock pressure and could be related to calorimetric observations. No cumulative long-range lattice misorientation resulted from shock-loading. The pores were found to be crystallographic in shape and were associated with the failure interface. Moreover, the pores contained structures interpreted as microtwinned regions. Author
- Properties of Metals and Alloys