Analysis of intergranular impurity concentration and the effects on the ductility of copper shaped charge jets

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A geometrical analysis based on an assumed tetrakaidecahedron grain shape is applied to determine the relationship among grain size, bulk impurity content, and breakup time in sulfur-doped, high-precision, 81-mm, oxygen-free electronic (ofe) copper shaped charge liners. The calculations determine the number of impurity atoms as a function of grain size, the number of available sites at the intercrystalline defects, and the intercrystalline impurity concentration. Recent experiments have shown that some larger grain size liners with low impurity contents exhibit better ductility than smaller grain size liners with higher impurity concentrations. Within the range of grain sizes and bulk impurity contents ... continued below

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11 p.

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Schwartz, A.J.; Lassila, D.H. & Baker, E.L. November 20, 1997.

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A geometrical analysis based on an assumed tetrakaidecahedron grain shape is applied to determine the relationship among grain size, bulk impurity content, and breakup time in sulfur-doped, high-precision, 81-mm, oxygen-free electronic (ofe) copper shaped charge liners. The calculations determine the number of impurity atoms as a function of grain size, the number of available sites at the intercrystalline defects, and the intercrystalline impurity concentration. Recent experiments have shown that some larger grain size liners with low impurity contents exhibit better ductility than smaller grain size liners with higher impurity concentrations. Within the range of grain sizes and bulk impurity contents in this study, the analysis suggests that the quadruple nodes and triple lines are saturated with impurities. Over this same range of impurities and grain sizes, only partial filling of a monolayer of impurities exists at the grain boundaries. The analysis suggests that breakup time is fundamentally related to grain boundary impurity concentration.

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11 p.

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OSTI as DE98052202

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  • 17. international symposium on ballistics, Midrand (South Africa), 23-27 Mar 1998

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  • Other: DE98052202
  • Report No.: UCRL-JC--129119
  • Report No.: CONF-980342--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 641352
  • Archival Resource Key: ark:/67531/metadc690736

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  • November 20, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 8, 2017, 12:42 p.m.

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Schwartz, A.J.; Lassila, D.H. & Baker, E.L. Analysis of intergranular impurity concentration and the effects on the ductility of copper shaped charge jets, article, November 20, 1997; California. (digital.library.unt.edu/ark:/67531/metadc690736/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.