The Strcture Of Sphere Convace Charge Numerical Simulation On Its Initiation Process

The appearance of insensitive ammunition has created new requirements for boosterpellet of detonation train. Namely, output of booster pellet has to be produced enough toinitiate insensitive ammunition. Traditional cylindrical booster pellet has much difficulty inmeeting insensitive ammunition's demand of dependable detonation. This being taken intoconsideration, the paper, through the combination of theoretical analysis, numericalsimulation and scientific experiment, researches the design theory of concave sphericalstructure booster charge structure, initiation process and initiation force, so as to the highoutput of little quantity, which offers scientific support for the development of insensitiveammunition in technique .1. Through the combined use of shock initiation theory, effective charge theory,congregated effect theory, wave shaping theory as well as corner effect theory, this paperdesigned cylinder outside concave spherical booster and taper outside concave sphericalbooster ,and gave their initiation features a full theoretical analysis.2. By using the VISUAL BASIC to be programmed and used the LS-DYNA software, itautomatically conducts of the concave spherical structure booster charge structure numericanalysis, and takes conclusions as below. The centre congregated energy of taper outsideconcave spherical booster is higher than cylinder outside concave spherical booster;and manysizes of concave spherical booster's numerical simulations of the initiation processes havebeen taken. Under the situation of the volume and radius of bottom be immovable, concavespherical radius has been changed, and get the curve of the concave spherical radius vs. thecentre highest pressure, as well as steel penetrated depth. First time initiating process of theconcave taper structure has been simulated with the LS-DYNA, and contrasted with theconcave spherical structure. The conclusion is that the centre pressure of the concave taperstructure is higher than that of the concave spherical structure.3. By using the personal behind disposing program it can get the curve of all sizes ofbooster s' pressure vs. the time and the functions. By using the Simpson integral method thefunctions can be operated and can get the impact explosion energy of all kinds of boosters.The conclusion is that the impact explosion energy of the concave taper structure is higherthan that of the taper outside concave spherical booster and higher than that of the cylinderoutside concave spherical booster.4. The experimental research is conducted on the initiation capacity of concave sphericalstructure booster pellets by making use of two ways.Experimental result shows: Initiating Capacity of concave spherical structure boosterpellet is higher than that of cylinder pellet by about 55%. Initiating capacity ofconical-concave spherical booster pellet is higher than that of circle-concave spherical boosterpellet. The experimental result has proved in agreement with that of the theoretical analysisand numerical simulations.