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A high yield of Ni-W-P nanoparticles with uniform size was prepared by electroless deposition within the nanopores of anodic aluminium oxide (AAO) template. The resulting Ni-W-P nanoparticles were amorphous and the Ni 3 P phase was appeared in the sample annealed at 623 K. The crystallisation temperature of the nanoparticles is 579 K, which is 100 K lower than that of the Ni-W-P film. The nanoparticles possess a low coercivity at room temperature as the film, showing soft magnetic characteristics.

The lethal power is the critical design index of the explosive warhead, mainly related to the number and mass of fragments formed by the warhead case. For the controlled fragmentation warhead case containing notches, the notch depth and spacing are the main factors affecting the fragment formation. This paper analyzes the influence of the notch number and depth on the network of fracture trajectories. It establishes a calculation model for the mass and number of fragments of warheads with various groove parameters. The lethal radius is obtained from the calculated fragment data and compared with the results of the experimental data and numerical simulation. The paper uses the genetic algorithm to obtain the optimal solution under various design variables, taking the groove depth and the number of circumferential grooves as the design variables and the lethal radius as the optimization objective. The optimized result is higher than without optimization.

In this paper, the ballistic limit velocity of 12.7mm armor-piercing incendiary projectile impacting a typical lightweight ceramic composite armor made of boron carbide ceramic and multi-layered composite materials (carbon fiber/aramid fiber/ultra-high molecular weight polyethylene fiber) was obtained experimentally. The process of impact was numerically simulated by the FEM-SPH method, and the results pointed out the characteristics of the penetration and the energy dissipation rule of each component of the ceramic composite armor. On this basis, the influence of thickness changing of the carbon fiber core layer on the ballistic performance of ceramic composite armor was studied with a typical “sandwich” structure, and the results showed that: when the thickness ratio of ceramic tile to the backing panel is about 1.5, the thickness changing of the carbon fiber core layer has the greatest effect on the ballistic performance. Under this thickness ratio, when the ratio of ceramic tile thickness to bullet diameter is greater than 1, the increase of carbon fiber core layer thickness will cause the ballistic performance index (BPI) of the target to decrease while the ratio is less than 1, the BPI increases or holds at first, and then decreases.