Study Of The .12.7 Mmpele Bomb Mechanism

12.7mm Penetrator with Enhanced Lateral Effect(12.7mmPELE)is a kind of new kill element, which has the compositive functions of both KE and HE projectile, without dynamite and fuze. It consists of a high-density jacket, closed at its rear end and filled with a low-density material. The penetrative performance of the jacket is excellent, but that of the inner is poor. During the penetration process, the low-density filling material is squeezed between the crater bottom and the rear part of the jacket. This induces a pressure rise, dilating the surrounding jacket, and therefore enlarging the crater. As soon as the penetrator perforates the target, stresses in the jacket and the core are unloaded and the jacket is broken into pieces in radial direction.12.7mm PELE is mainly used in the domains of aerial defence, antimissile ammunition, striking the light-armor on the ground and offing, and so on. Because of the eximious fragmental ability, it shall effectively damage the objects behind the target. Hence, the study on PELE has academic and guiding significance to overcoming the disadvantages, onefold function, of ammunitions in being, and achieving impactful damage not only in a spot but also in an area.Through theoretical analysis, numerical simulations and experimental methods, the functional mechanisms of PELE, especially the key factors that influence the lateral efficiency of PELE, are studied systemically.The followings are the main contents of this dissertation:1) The velocity of debris behind the plate is researched after PELE perforated thin metal target perpendicularly. The theoretical and numerical models on the residual velocity and the radial velocity of PELE penetrating into a thin target are established and calculated. The mechanism of the production of lateral effect is illuminated in detail, and the relation between the lateral effect and the parameters of PELE is offered.2) The influence of the parameters about PELE on its lateral effect is investigated. The outcomes of the study indicate the following several rules. Firstly, Poisson's ratio and Modulus of elasticity of the filler affect the lateral effect of PELE remarkably. Secondly, with the impact velocity increasing, the residual axial velocity augments gradually, but the lateral velocity of the debris increases at first and then drops and goes up gradually afterward. And lastly, with the enlargement of target thickness, the lateral effect of PELE boosts up in the beginning and weakens subsequently.