Study On The Strcture Of High-Effect-Booster Charge And Numerical Simulation On Its Initiation Process

The appearance of insensitive ammunition has created new requirements for booster pellet of detonation train, namely, output of booster pellet has to be produced enough to initiate insensitive ammunition. Traditional cylindrical booster pellet has much difficulty in meeting insensitive ammunition's demand of dependable detonation. This being taken into consideration, the paper, through the combination of theoretical analysis, numerical simulation and scientific experiment, researches the design theory of high-effect-booster charge structure, initiation process and initiation force, so as to the high output of little quantity, which offers scientific support for the development of insensitive ammunition in technique.1. Through the combined use of shock initiation theory, effective charge theory, mohaupt effect theory, wave shaping theory as well as corner effect theory, this paper designed the following four booster charge structures: annular structure, conical annular structure, concave spherical structure and half-spherical structure, and gave their initiation features a full theoretical analysis. The designs of conical annular structure and concave spherical structure are first pioneered.2. Multi-point initiation technique is used to initiate annular and conical annular booster pellets for the first time. Four-point-synchronous explosive circuit and eight-point-synchronous explosive circuit are designed respectively for initiation annular and conical annular booster pellets, and the analytical calculation on their synchronous time isbeing conducted at the same time.3. Supported by LS-DYNA software, the paper conducts numerical simulation of the initiation processes of the four booster pellets that are different from each other because of their structures, and it turns out that the result is the same as that of theoretical analysis. The author carries out for the first time the numerical simulation of conical annular booster's radial syntaxis process on the condition of multi-point initiation and finds the diagrams of syntaxis process and axial propagation process.4. The experimental research is conducted on the initiation capacity of four booster pellets by making use of many ways.Experimental result shows:1) On the condition of multi-point explosive, capacity of annular booster explosive is higher than that of cylinder by about 57%. Effect of eight-point-synchronous explosive circuit is better than that of four-point-synchronous explosive circuit.2) On the condition of multi-point initiation, capacity of conical annular booster pellet is higher than that of cylinder by about 65%. Effect of eight-point-synchronous explosive circuit is better than that of four-point-synchronous explosive circuit.3) Initiating Capacity of concave spherical structure booster pellet is higher than that of cylinder pellet by about 55%. Initiating capacity of conical-concave spherical booster pellet is higher than that of circle-concave spherical booster pellet.4) Initiating capacity of half-spherical booster pellet is higher than that of cylinder by about 32%. Larger diameter is, larger capacity is.The experimental result has proved in agreement with that of the theoretical analysis and numerical simulations.