Research On The Mechanism Of A New Kind Of Tandem Warhead Systems Against Concerete

Accompanying with the stronghold and subterranean of the defense system, routine weapon should be more and more powerful. How to defeat these hardened structures especially targets with concrete layers becomes one of the most important topics in the world. Tandem warhead system consists of precursor shaped charges and following kinetic energy (KE)projectile containing a high explosive filling is becoming one of the most effective way to destroy this defense system in the world. A new kind of tandem warhead systems is described in this paper, the main mechanism of which including the process of the relay penetration are studied by experimental, theoretical and numerical method. Main contents in the paper were as follows:1Stydy on mechanism of precursor shaped charge penetrating into the concrete targets.Theoretical equation of the penetrating of shaped charge jet penetrating concrete targets has been set up using the continuous model. An engineering model of eroding JPC penetration model has been set up on the basis of conservation of mass and momentum. They are applied to analyze the influence on the depth and diameter of some parameters, such as velocity grades adius of jet and stand-off. It is validated E/V criterion by product. Three typical shape charges are presented by the numerical simulation. The features of the jets are studied under different conditions such as different thickness. Also the features of the jets penetration are studied. The shapes of the penetration cavity are gotten, and then some better charges are defined.2Study on the mechanism of shaped charge works in the precursor cavity.At first, the explosive performance of the second shaped charge in the precursor penetration cavity based on the modified cavity expansion theory, the radius of the explosive cavity is gained; Numerical simulation is made to modify the results. At last, the penetration and explosive performance of the second shaped charge are analyzed, the finally cavity is gained. Based on the mechanism of shaped charge, some states of the precursor cavity are reasonable simplified, the influence of the shape of the precursor cavity, precursor detonation product and shock wave pressure toward the second shaped charge is analyzed. The influence of the shape of the precursor cavity, such as relative diameter of the cavity, relative depth, oblique angle and whether connection or not are calculated toward the shape of the jets are studied by numerical simulation; Also the influence of the shock wave pressure of the precursor cavity and the velum of detonation product were studied by numerical simulation. Tests of the performance of the shaped charge working in the constraint penetration cavity are made, performance of the cavity depth and radius in the penetration of the second shaped jets is gained.3Study on the mechanism of relay penetration to the concrete.At first damage model of the concrete is set up based on the some reasonable concern of the pre-damage concrete penetrated by the precursor shaped jet. Penetration model is set up by shaped jets penetrator way, which is used to calculate the relationship between the strength weakening degree of the concrete and the shape of the penetration cavity, numerical simulation is made to modify the result. Then finite element software is used to simulate the influence of the shapes of the cavity and the stand-off of the shaped charge, also the explosive powder and explosive pressure. The penetration depth of the second shaped jets is gained. Tests about the matching relationship of the precursor two shaped charges are made, when the first charge is K charge, the second charge is hemisphere charge, the cavity is much better. Tests are also made about the explosion interruption structure;some more better structures are gained.4Study on the matching relationship of the precursor two shaped charges.The matching relationship of the penetration cavity depth and radius, the structure of the two charges, the diameters ratio of the two charges is studied by numerical simulation, and then much better structures are gained. Overpressure value and sustained time of the shaped charge when the jets formulates is gained by the numerical simulation and theoretical calculations way under different distance, which could do help for the designing of the explosion interruption.Overpressure value and sustained time of the shock wave are gained using explosive theory which could do help for the designing of the explosive interruption structure, and then numerical simulation is made to modify the results. Performances of different materials using in explosive interruption are calculated using shock wave theory, and then numerical simulation is made to modify the results. Also different explosive interruption structures are designed; some more better structures are gained by simulation calculation.