Application of nanomaterials in improving the nail-breaking performance of metal jets

Modern science and technology development has put forward high requirements for armor performance. In this study, a coating based on nanocrystalline copper was proposed to further improve the mechanical properties of the coating and prolong the effective action time of the jet. Equal-diameter angular extrusion was adopted for the grain refinement of pure copper. Cold rolling was performed to strengthen the mechanical properties of nanocrystalline copper, laying a foundation for the follow-up work. The manufacturing process of the drug-type cover was then optimized and improved, and the two-phase theory of jet penetration was introduced to design and analyze the process in detail. Finally, simulation experiments were conducted to analyze the mechanical properties of nanocrystalline copper and the properties of the penetration process. Nanocrystalline copper had significantly improved tensile strength, yield strength, and other properties than the original material. In particular, the tensile strength increased to 195 and 208 MPa in two directions. In the penetration simulation experiment, the shaped charge performance of nanocrystalline copper increased by about 25% compared with that of the original material. Therefore, the nanocrystalline copper synthesized by equal-diameter angle extrusion can improve the jet armor-breaking performance.