Correlations between shaped charge jet breakup and grain boundary impurity concentrations
In a study by Duffy and Golaski shaped charge liners made from ETP copper were reported to produce jets which had distinctly different break up behavior as a function of the grain size of the liner; small grain size liners produced relatively ductile jet break up while the larger grain size liners resulted in brittle and particulated jet break up. In this work the high temperature embrittlement of ETP copper with grain sizes of 15 {mu}m and 120 {mu}m was investigated and correlated with the break up behavior reported by Duffy and Golaski. Tensile testing performed over a range of test temperatures indicated that the large grain size material was extremely brittle relative to the small grain size material. Analytical techniques were used to examine impurity migration during annealing heat treatments. These experiments indicate that increase in grain size during high temperature annealing can be accompanied by a significant increase in the segregation of embrittling elements at grain boundaries. The results of this study suggest that the presence of embrittling elements at grain boundaries is a primary factor in the break up characteristics of copper shaped charge jets.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10129757
- Report Number(s):
- UCRL-JC-107156; CONF-920689-3; ON: DE92009597
- Resource Relation:
- Conference: Symposium on ballistics,Stockholm (Sweden),1-3 Jun 1992; Other Information: PBD: Feb 1992
- Country of Publication:
- United States
- Language:
- English
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