Numerical Simulation of CoCrFeMnNi High Entropy Alloy Shaped Charge Jet and Its Penetration into a Target Plate

The continuous advancement of modern armor protection technology has imposed severe challenges on the damage power of shaped charge warheads. Traditional liner materials have become a major constraint in improving penetration depth due to their limited comprehensive performance. High entropy alloys (HEAs), owing to their unique multi-principal element design, exhibit core potentials, such as high strength, high hardness, and excellent dynamic fracture toughness, thereby making them highly promising candidate materials for new-generation liners. In this study, the CoCrFeMnNi high entropy alloy was prepared via selective laser melting (SLM) technology, and the mechanical properties of the alloy were tested under quasi-static and dynamic loadings. The Johnson-Cook (J-C) dynamic constitutive model and related parameters for the CoCrFeMnNi HEA were determined. Using LS-DYNA, shaped charge jet formation models for both copper and high entropy alloy were established, and numerical simulations were carried out on the processes of jet formation and target penetration for copper and HEA. The research results indicate that, when compared with copper, the CoCrFeMnNi HEA liner can form a more stable and continuous jet. Its unique formation and stretching-breakup mechanisms ultimately result in greater penetration depth, confirming the significant advantage of high entropy alloys in the enhanced damage effect.