Velocity field distribution of metal cylinder fragments under explosive dynamic load
Aiming at the problem that Gurney formula cannot reflect the axial variation of fragment velocity field along the shell,a simulation model is established by AUTODYN software to analyze the effects of aspect ratio and shell thickness on fragment velocity field distribution.The Gurney formula is modified by considering the shell fracture process under explosive loading.Based on the above research,the axial distribution model of fragment velocity field is established by introducing the shell length diameter ratio and relative wall thickness into the exponential correction factor.Finally,the rationality of the model is verified by experiments.The results show that for cylindrical warhead,the relative wall thickness is constant,and the greater the aspect ratio is,the closer the fragment formation velocity is to v0.When the aspect ratio is constant,the smaller the relative wall thickness of the shell is,the closer the fragment formation speed of the warhead is to v0.By comparing the theoretical results of this paper with the Gurney theoretical results and experimental results,the errors of the theoretical results of this paper are all within 7％,and most of the errors are less than 3％,which is more consistent with the experimental results,which verifies the rationality of the fragment velocity field axial distribution model established here.The theoretical model here can provide reference for the precise design of fragmentation parameters of kill warheads.
fragment velocityGurney formulashell wallthicknesslength diameter rationumerical simulation
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