Structural damage simulation of mechanical initiation explosive device under high overload impact

Initiation explosive devices are prone to deform under a certain impact load. With the development of new high-overload ammunition and composite warhead ammunition, initiation explosive devices are faced with the requirement of high overload resistance. The information of product overload can be obtained by using Hopkinson bar or air cannon, but the changing process of product under overload impact cannot be obtained. To get dynamic mechanical properties and the weak parts of the shell when stab-delayed explosive devices, a typical mechanical initiating explosive device, are under high overload impact, ANSYS/LS-DYNA finite element numerical simulation method is used to study the deformation characteristics and rules of the shell and main charge under high overload impact, and the split Hopkinson pressure bar technology is used to verify the deformation for the shell of stab-delayed explosive devices. The results all show that the weakest parts of the stab-delayed explosive device caused by overload impact were identified as the input end, middle and output end. Under the unconstrained overload impact, the deformation rate of the output end is lower than that of the input end and the middle part. There is a linear relationship between the compression deformation rate of the total length of stab-delayed explosive device and the overload impact. The results provide theoretical and technical support for the design of the stab-delayed explosive device suitable for harsh mechanical environments in the future.