13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- Figure 7. The perforation process of 6mm thick Weldox460E steel plate under normal impact by projectile with θ=60o through numerical simulation. Fig.8 shows the perforation process of 6mm thick Weldox460E steel plate under normal impact by conical-nosed projectile with θ=100o through numerical simulation. It can be seen from Fig.8 that a plug of diameter larger than the diameter of the projectile is ejected. The crack occurs firstly at the distal surface of the plate, and then propagates to the frontal surface of the plate, finally a full plug is ejected due to stretching and shearing. The plug is formed due to the mixed failure mode of stretching and shearing, and the failure mode here is classified to discing with global deformation. Figure 8. The perforation process of 6mm thick Weldox460E steel plate under normal impact by projectile with θ=100o through numerical simulation. Fig.9 shows the perforation process of 6mm thick Weldox460E steel plate under normal impact by conical-nosed projectile with θ=140o through numerical simulation. It can be seen from Fig.9 that a plug is ejected which is similar to that in Fig.8, but the difference is that the diameter of the plug here is less than that in Fig.8, which is approximately equal to the diameter of the projectile. The plug is formed mainly due to the failure mode of shearing, and the failure mode here is classified to plugging with global deformation.
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