Simulation of flyers driven by detonation of copper azide

Aim to optimize the design of MEMS copper azide fuze and investgate the mechanism underlying the process of the copper azide explosive-driven flyer plate. According to the actual design of the micro-charge fuze and its related experiments, the process of the copper azide explosive-driven flyer plate was simulated adopting the fluid-solid coupling algorithm in LS-DYNA program. The influences of the barrel's length on the flyer's velocity and integrity were studied and the relationship between the micro-charge size and the flyer's velocity were discussed. Our research results indicate that the barrel's length has a major impact on the flyer's velocity and integrity. It is found that, when it is accelerated in a long barrel, the flyer is likely to be more fragile and cannot achieve maximal driving velocity. The size of the micro-charge is uniquely related with the flyer's velocity in that the flyer's maximum velocity is significantly affected by the charge's diameter. With the increase of the thickness of the charge, the average velocity and the maximal velocity were raised gradually. When the charge diameter is above 0.8 mm, its influence on the flyer's maximal velocity is not remarkable.