Mechanism Study Of Muti-mode Shaped Charge In Point-Ring Ignition

Different configuration of shaped charge can form different penetrators, such as jet toattack decorous armor, Jetting Projectile Charge (JPC) to deal with decorous armor at furtherranger, or Explosively Formed Projectile (EFP) to invade light armor. We also can acquire manyfragments to deals with persons by designing a mechanical device. Through changingdetonating position, different penetrator suit to different battlefield could be achieved. Thatconcept is defined as multimode chaped charge warhead.This paper carried on the research by means of theorical analysis, numerical imitationand experiment. Main jobs conclude building up theorical model for formation process ofpenetrator under condition ring ignition, the method of acquiring coefficient of defoumiucsformula, model for getting speed of stabilitable EFP.This paper studied the effect of ignition way on forming penetrator with numbericalimitation, design principle of stern explosive structure, and influence on forming jet whilereverse ring ignition. In addition, we studied the performance regulation of penetratorwhether explosive radius cover or equal that of liner. Using an ejectable mechanical devicea method was developed, this device is attached to the front of warhead, when used in thesingle EFP mode, so we can get stabable EFP, extended EFP, and muti-fragments.Main research and the innovation as follows:In the first chapter, some contents were introduced, such as domestic andinternational development about mutimode shaped charge, characteristics of every modepenetrators, research purpose, research means and the research contents.In the second chapter, it were studied that theoretical model on forming penetratorunder condition ring detonation, Analyzed physical and chemical characteristics duringpenetrator forming process, exploding regulation, collapse of liner, liner movement andgathering on the symmetry, built up the homologous description model and formulas. Themain innovation is applying PER theory on describing formation of the big angle liner,computing formula coefficient through using imitation, describing jet forming process withthe PER theory.In the third chapter, the method combined theories analyzing and imitation was usedto study forming process of shaped charge. Regulation of jet formed when reverse ring detonation was explained, it was elaborated that thickness of liner should not exceed onepercent of explosive diameter and angle not exceed 120 degree to assure top speed of jet8000m/s approximately, but this design cannot form stability EFP in reverse ring ignition.because the theories model of chapter two can't describe the formation process that thestability EFP, this chapter built up the rougher model than chapter two to decribing speed ofstable EFP, then we computed regulation of the speed of EFP due to variety of detonationposition. For the super caliber of the stem explosive structure, it was studied penetratorvariety as varying explode position.In the fourth chapter, we introduced calculaterical method of imitation, itscharacteristics, and international common software, then selected the numberical principle,material formulation, and the material parameter. On the other hand, in order to certifyaccuracy of imitation at the same time, it was certificated that mesh size of 0.12 cm canassure consistency between imitation and experience. performances of penetrators both ringignition and point-ring ignition, were studied with imitation. It was elaborated top speed ofpenetrator higher and extender, so we can draw a conclusion point-ring ignition is suitablefor multimode warhead. After studied the effect about explosive stern structure onformation of penetrator, we acquired regulation caused by explosive radius and angle. Atlast, after researched configuration of shaped charge which radius of explosive equal that ofliner, we designed better multimode shaped charge.In the fivth chapter, some conclusions combined in former chapterses, throughingdesign structure of warhead,we acquire good EFP and JPC, it is confirmed that penetratorshould convert by changing igniton position, and discovered characteristics of penetratorformation,all of that made foundation for the total design of muti-mode shaped charge.Main conclusion and innovation was synthesized on the sixth chapter, existentshortage and future outlook also be pointted.