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