Study on the law of charge density and constraint effect on impact initiation characteristics
To reveal the impact initiation characteristics of the interaction between two insensitive explosives and the identification block under different charge conditions,the propagation law of explosive detonation wave and the evaluation of explosive power were explored.Based on the initiation test and numerical simulation,the Lee-Tarver ignition growth model parameters of TATB and passivated RDX with different densities were obtained by combining the γ law equation.Numerical simulation and experimental research were carried out under the condition of typical 8 mm detonator with axial output.The detonation propagation characteristics of two insensitive explosives were studied by controlling the charge density and shell constraint strength.The results showed that the axial output capacity of No.8 electric detonator was reliable,and the maximum velocity of the projectile was 3 730 m/s when the bottom cavity of the detonator was deformed by detonation wave.For TATB detonation with density of ρ =1.60 g/cm3,ρ = 1.70 g/cm3 and ρ =1.80 g/cm3,the difference between the minimum and maximum steel concave values measured by the test was 1.54 mm,and the output capacity of the explosive was linearly positively correlated with the density.With the increase of confinement strength,the impact impedance increased,the dent value of the identification block increased,and the axial output capacity of the booster increased.
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