The Simulation Analysis Of Prefabricate Fragment Warhead Explosion Power Field

With the explosion of the prefabricate fragment warhead the energy is released and come with intense shockwave and high temperature and high pressed production. Meanwhile, after obtain energy the fragment will scatter with certain velocity,so the shockwave and the scattering fragments are the two elements that will kill and wound the target. in this case it is very necessary for use to study the pressure field and the fragment field.As the process of the detonator explosion and the impaction of the fragment is very complicated either in physics or in mechanics, so it is very difficult for us to study theoretically but if we do experiment, it will cost plenty of fund and time. The economical way is simulation.Nowadays, with the development of the technique of the computer and the improvement of the means of the simulation, simulation has become a very important way to study the pressure field and the fragment field of the prefabricate fragment warhead. via finite element program I build the prefabricate fragment warhead model and calculate pressure field and the fragment field.These are what I did in this thesis:On the base of the analysis of the theory of the explosion I build two kind of 3d ls_dyna prefabricate fragment warhead models. One include one layer prefabricate fragments and the other include two layer prefabricate fragments. They all explode at the center of the bottom of the warhead.After calculation I analysis pressure field and the fragment field including shock wave, exceed pressure, compare with the theoretical result it shows that the simulation result fix with the theory formula very well. in term of the warhead with two layer prefabricate fragments there is still no theoretical formula to calculate the result ,by comparing with the simulation result I give the advice for the modifying of the theoretical formula for the warhead with two layer prefabricate fragments and provide reference for the design and optimizing of prefabricate fragment warhead.