## 3 Experimental and Numerical Simulation Data Analysis
### Numerical Simulation Results  
Figures 6-8 show the circumferential strain cloud diagrams of 8 mm, 14 mm, and 20 mm-thick cylindrical shells under different charges by numerical simulation, while the numerical calculation results were compared with the experimental results, as shown in Figure 9.  
The numerical results show that the deformation of cylindrical shells with different thicknesses at the blast center is basically identical at the same specific distance. The experimental results show that under the same specific distance, the deformation at the explosion center of 20-mm-thick cylindrical shell is smaller than that at the explosion of the 8-mm-thick cylindrical shell. The experimental results are inconsistent with those by numerical simulation, mainly because the influence of the stress gradient along the thickness direction of the shell and different fracture modes on the overall strength of the material was not considered in the numerical simulation. This problem can be solved by accumulating experimental data and constantly modifying the parameters of the numerical simulation. The calculation results of the dynamic response of the cylindrical shell under loading of 41.6 g TNT explosive shock wave are analyzed as an example. Figure 10 shows the pressure time\(-\)history curve of the explosive shock wave loaded onto the inner surface of the cylindrical shell directly opposite to the explosion core. It can be seen from the curve that the explosive shock wave formed by the TNT explosion is loaded onto the inner surface of the cylindrical shell after propagating for a period of time (about 11 \(\upmu\)s in front of the pressure curve of the shock wave loaded on the inner surface of the cylindrical shell). The shock wave pressure rises rapidly on the inner surface of the shell, and the peak pressure on the blast core reaches 1000 MPa. Under the action of high intensity shock wave pressure, the shell rapidly deforms in the radial direction. According to the principle of explosion mechanics, the load intensity of the blast wave decreases with the increase of the distance from the explosion center. Therefore, the point on the inner surface of the cylindrical shell  
Figure 8: Circumferential strain cloud of 20 mm-thick shell at 233, 403, and 623 g TNT. Figure 9: Comparison between experimental and numerical results. with a larger distance from the explosion center section will bear a smaller load of the blast wave, resulting in overall deformation of the cylindrical shell that is radially bulging. The explosive loading of the destruction process of 20# steel-made cylindrical shell is shown in Figure 11. It can be seen that along with the column shell expansion process, the plastic damage zone is first formed within the shell, and then the crack produced by the shell wall of the damage area extends outward along the direction of the shear surface, and finally forms the internal initial shear failure along the shear direction. Table 4 shows the numerical simulation results. It can be seen that the deformation of the middle section at the same specific distance has little difference under different thicknesses of shells, while the deformation decreases more slowly as the thickness increases at the far end of the core section. The numerical simulation of 20# steel. The numerical simulation results of the 8-mm-thick steel shell of under 16 g TNT are analyzed. The steel shell is divided into three thickness units along the radial direction