Grain Boundary Engineering of Copper Shaped-Charge Liners


Shaped-charge liners (SCLs) are thin metallic cones which, when explosively driven to high strain rates and pressures, collapse and extrude a high speed jet. The liner material experiences strain rates of 104 to 107 s−1, and the tip of the extending jet travels at several kilometers per second. SCLs are used for penetration purposes by defense, mining, and oil drilling industries. To maximize penetration, jets must remain intact as long as possible; liner performance is subsequently quantified by the time to breakup (tb). A key factor in extending tb is the ductility of the jet. The ultimate ductility of a shaped charge jet is controlled by the characteristics, configuration, and design of both the high explosive drive and the liner material. Here, we endeavor to enhance SCL performance through an improved understanding of the relationship between liner properties and jet ductility which will facilitate production of engineered liner materials. This “materials by design” approach is predicated on knowing the materials' structure-property relations that influence jet ductility.

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Correspondence to Kerri J.M. Blobaum.

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Blobaum, K.J., Stölken, J.S. & Kumar, M. Grain Boundary Engineering of Copper Shaped-Charge Liners. MRS Online Proceedings Library 819, 327 (2004).

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