Simulation of shock wave action from an explosive device on a protective shell
DOI:
https://doi.org/10.32347/2410-2547.2025.115.33-42Keywords:
protective shell, explosive device, shock wave, finite element method, static and dynamic analysisAbstract
The numerical approach to investigate the protective shell behavior under shock wave from an explosive device was presented. Comparison of shock wave characteristics from different explosive devices that were obtained experimentally and by Sadovsky’s analytic formulas was made. The hemispheric geometrical model of shock wave and two finite element models of the cylindrical steel protective shell with the surface areas that had certain values of overpressure and positive impulse were created using NASTRAN software. As an example, the positive phase of shock wave from an explosive device with a TNT equivalent of explosive mass 250 kg was considered. Overpressure was given as the evenly distributed load which depended on the distance from explosion epicenter to the shell surface areas. Shell behavior from the static action of overpressure was investigated in the nonlinear formulation by the Newton-Raphson method and compared with the results of the linear static and buckling analysis. The critical load coefficients and static characteristic of shell were obtained. The first step of the dynamic investigation was modal analysis of shell using the Lanczos method. The positive impulse was presented in the shape of a triangle with a certain time of action. The largest period of shell natural oscillations was taken account. Influence of positive impulse of shock wave on the dynamic behavior of the two shell models was investigated by the fourth-order Runge-Kutta method. The shell state at the different time of positive impulse was presented. The results of static and dynamic analysis allowed to assess the impact of shock wave action from the explosive device on the stressed deformed state of the protective shell.
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