| This paper mainly study the detonation energy release and shock sensitivity of composite charge, expecting to gain the optimum design of composite charge. The composite charge which interior is HMX based explosive and the exterior is TATB based explosive. Through altering the radius ratio Lr and the high ratio Lh of the interior explosive with the whole composite charge,27 groups charge are designed, and the 50mm cylinder test of the 27 groups charge are studied by numerically simulated with LS-DYNA finite element method, expecting to find how the configuration of composite charge work on its detonation energy release. Based on the cylinder test numerically simulation,5 groups charge are selected and their gap test are studied by numerically simulated with LS-DYNA finite element method also, expecting to find how the configuration of composite charge work on its shock sensitivity. Main conclusions can be reached by numerically simulation as follows:(1) As can be seen from the results of cylinder test numerical simulation, when the radius ratio Lr is certain, the cylinder wall expansion velocity and ratio energy decrease as the descending of the high ratio Lh; when the high ratio Lh is certain, the cylinder wall expansion velocity and ratio energy decrease as the descending of the radius ratio Lr. Simultaneously, we can seen from cylinder test numerically simulation, when Lr<0.4, the variety tendency of detonation energy release is unremarkably.(2) As can be seen from the results of gap test numerical simulation, the shock sensitivity of composite charge is between that of HMX based explosive and TATB based explosive. The larger of the high ratio Lh, that is mean the thinner of the insensitive explosive, the shock sensitivity of composite charge tend to the HMX based explosive more remarkably; The smaller of the high ratio Lh, that is mean the thicker of the insensitive explosive, the shock sensitivity of composite charge tend to the TATB based explosive more remarkably. |
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