Accession Number : AD0766951

Title :   Fracture Mechanisms Caused by Shock-Induced Microtwinning.

Descriptive Note : Final rept. Jul 72-Jun 73,

Corporate Author : RUTGERS - THE STATE UNIV NEW BRUNSWICK N J BUREAU OF ENGINEERING RESEARCH

Personal Author(s) : Greenhut,Victor A.

Report Date : AUG 1973

Pagination or Media Count : 9

Abstract : 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)

Descriptors :   (*COPPER, FRACTURE(MECHANICS)), CRYSTAL STRUCTURE, TWINNING(CRYSTALLOGRAPHY), FAILURE(MECHANICS), MICROSTRUCTURE, TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, SHOCK WAVES, PLASTIC PROPERTIES, DISLOCATIONS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE