Tests and numerical simulation for hemispherical EFP penetrator damaging a concrete wall

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (1) : 10-18.

HAO Likai1,2, GU Wenbin1, ZHANG Yadong3, YUAN Qi4, ZOU Shaoxin1, LIU Mingjun5, LIU Sengqi2

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Abstract

To deeply study the penetration effect and damage mechanism of concrete targets under the action of the shaped charge, Φ 120 mm EFP with hemispherical liner was designed to carry out experiments of penetrating a concrete wall at different standoff distances. Based on the RHT model with modified parameters, the maximum relative error between simulation results and experimental data is 9.8 %, indicating that the RHT model has a good correction effect and the numerical model is reliable. On this basis, the impact of the standoff distance on the penetration damage effect is analyzed, and the combined damage element characteristics of the EFP penetrator and the explosion shock wave are studied. The results show that when the designed EFP penetrates the concrete wall, a funnel pit with a large diameter and depth is formed on the wall. When the standoff distance changes from 20 cm to 60 cm, with the increase of blasting height, the diameter of the funnel pit decreases gradually, and the depth of the funnel pit decreases first, then increases and then decreases, and tends to be stable. When the standoff distance is 20 cm (1.67 times of charge diameter), the funnel pit with a large diameter and depth can be obtained. The diameter is about 6.83 times the charge diameter, and the depth is 2.3 times the charge diameter. EFP penetration plays a leading role in the formation of the funnel pit, and within a certain explosion height range, the explosion shock wave can increase the diameter of the funnel pit, and its coupling with the EFP penetrator can improve the depth of the funnel pit to a certain extent.

Key words

hemispherical liner / explosively formed projectile (EFP) / penetration / explosion shock / concrete / funnel pit

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HAO Likai1,2, GU Wenbin1, ZHANG Yadong3, YUAN Qi4, ZOU Shaoxin1, LIU Mingjun5, LIU Sengqi2. Tests and numerical simulation for hemispherical EFP penetrator damaging a concrete wall[J]. Journal of Vibration and Shock, 2023, 42(1): 10-18

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