Containing Fragments Explosion Drive Stability Study

Stability of energetic fragment during high velocity explosion driving is studied in this dissertation. Dynamic shock response under explosion driving based on one-dimensional shock wave theory is presented. Explosion interrupted material is used to attenuated the explosion load, and shock wave attenuation during it propagated in explosion interrupted material is analyzed theoretically.Main contents in this paper as follows:First, dynamic response during high velocity impact between the energetic fragment and the target are studied; Based on the theory of the impact initiation, the critical initiation energy of the energetic materiel in fragment is presented. At the same time, the critical initiation condition for energetic fragment is given out.Second, based on the characteristics of fragment warhead, The mathematical model of the relationship between the initial velocity and the structural parameters of fragment projectile which include the high explosive charge, explosion-interrupted material, fragments and other components is presented. Based on the study of the attenuation law of the shock wave in different media, the explosion driving process of three typical materials is mainly analyzed. The results show that shock load in energetic fragment is significant decreased by using the interrupted material which ensure no broken and reaction in energetic fragments.Third, three-dimensional computational studies are used to simulate the explosion driving process of energetic fragment by using finite element program of LS-DYNA.1/4 finite element is used to carried out the simulation. Typical shock wave propagation in interrupted material and energetic fragment is given out. The results agree well with the above analysis and the interrupted material has high value in attenuating the shock load in energetic fragment.Fourth, Based on the theoretical analysis and numerical simulation, the influence of shock wave attenuation of interrupted material to initial velocity of energetic fragment is analyzed. A comparison between theoretical model and numerical simulation is carried out. The result has high value for the design of energetic fragment warhead.