Ring Efp Formation Mechanism

Annular EFP is annular explosively formed penetrator in the symmetrical and circumferential direction of the annular liner formed from the annular liner invert caused by the detonation productions act of annular shaped charge. Annular EFP is able to penetration into a target with a big aperture and the length-to-diameter ratio of the annular shaped charge is small. As a new conceptual destroying unit, it will take full advantage of that when it applied to tandem warhead. And the following projectile diameter and charge weight can be increased, so the damage effectiveness of the warhead can be improved. The study on annular EFP has academic significances to the development of tandem warhead.The structural design proposal of annular shaped charge is proposed according to the annular liner. Molding and inverting process of the annular EFP is established. The Laws of velocity change of inner and outer walls of liner are obtained with calculation. And various factors which have influence on molding process of the annular EFP are also investigated using digital simulation technique. Meanwhile Orthogonal Optimization Design is used to optimize structure parameters of the annular liner. Based on analyzing the formation mechanism of annular EFP, the simulation analysis of annular EFP attacking the 45~# steel target is carried out.The results show that the specifically designed annular liner is able to formed annular EFP with the detonation productions act of annular shaped charge. And based on the length-to-diameter ratio of the annular shaped charge is 0.26 times the size of charge's diameter, annular EFP penetrating 45~# steel target forms a hole of 0.96 times the size of charge's diameter.