Study on the forming morphology and penetration performance of spherical defect EFP in different media

DOI:	10.11809/bqzbgcxb2024.10.024
Keywords:	ball missing type EFP; shaped charge; numerical simulation; underwater penetration; water form
Abstract:	In order to study the influence of different media on the formation of explosively formed projectile ( EFP ) with variable wall thickness spherical liner, a variable wall thickness spherical shaped charge with a diameter of 12 cm and a middle thickness and a thin edge was designed. The formation and penetration of EFP in different media were numerically simulated by LS DYNA software, and the effects of air and water media with different lengths on the forming morphology and penetration performance of EFP were discussed. The results show that the variable wall thickness spherical shaped charge can not be flanged and pressed to synthesize EFP in water. The formation of EFP needs to add a section of air at the front end of the liner. The air length has a significant effect on the water entry form, water form and velocity distribution of EFP. The water medium has a self forging effect on the shape of the unformed EFP, and changes the shape of the formed EFP greatly, so that the penetration performance of the former in water is better than that of the latter. Under the influence of different lengths of air and water media, the variable wall thickness ball shaped EFP still has the power to penetrate the 3cm target plate, which can meet the damage effectiveness requirements of the mine destroyer under different combat conditions.
Issue:	Vol. 45 No. 10 (2024)
Published:	2024-10-31
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