Abstract：The shock initiation of composite shell charges under the impact of fragments was studied.Simulations were compared with experimental results.The research on the pressure peak and energy change of the explosive in the protection of the different composite shell was carried out.By comparing different configurations, it was obtained that the pressure peak of the explosive in the protection of the composite shell with low wave impedance of the interlayer material reduce to 36% of that obtained from single steel shell.And the result also shows the higher strength and modulus of the interlayer material, the better performance of against penetration of fragments and energy absorption of the composite shell.By changing the arrangement of composite shell, placing the SPUA near the explosive, the pressure peak of explosive is 30% of the single steel shell, and the absorption of energy is a magnitude lower than that of the single steel shell.With a certain thickness of the composite shell, it is found that the pressure peak of the explosive of the steel-SPUA shell is 64% of the single steel shell, and the energy transmitted into explosive is half of the single steel shell.Therefore, the composite shell reduces pressure peak and the energy transmitted into composition B significantly, and improves the ability of explosives against shock initiation of fragments.
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