Influence of Structural Characteristics on EFP Formation Under Different Liner Materials

Abstract

To further research the relationship between structural characteristics and materials of liner on explosively formed penetrator (EFP) formation, by using the LS-DYNA finite element software, the coupling effects of the structure and material on the formation of EFP were simulated, considering six structures (truncated, conical, tulip, arc, horn, arc cone liner) and five materials (aluminum, OFHC copper, Armco iron, tantalum, tungsten alloy). Under the condition of similar liner structure and mass, liner structure has little effect on the velocity of EFP, however, density play a remarkable negative relevant role. In the respect of EFP formation, OFHC copper liner with good elongation will obviously stretch to reach a lager length-diameter ratio (L/D) at all presented structures in this article. Furthermore, liner structure should be identified to a specific material and objective requirements. Although formed EFP with low solidity, arc liner makes Armco iron, tantalum and tungsten alloy to develop L/D and flight stability. Truncated liner has great benefit to OFHC copper EFP on L/D and solidity at the expense of little flight stability. Aluminum EFP of arc cone liner has both lager L/D and suitable solidity and flight stability.