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| Analysis on the initial velocity field of a multi-layer spherical fragment driven by explosio |
| CHEN Xingwang,WANG Jinxiang,TANG Kui,LIN Shangjian,LI Yuanlong |
| National Key Laboratory of Transient Physic, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract In order to calculate the initial velocity field of a multi-layer spherical fragment under the explosion drive accurately, based on the Gurney hypothesis and the assumption of equal probability of the force and force between adjacent layer particles a theoretical calculation model of the initial velocity field of the fragment was established by applying momentum and energy conservation.In the calculation model, the difference of the void ratio caused by arrangement was ignored.The model can reflect the influence of explosive density and fragment density, layer number and diameter on the initial velocity of the fragment.The LS-DYNA 3D nonlinear finite element program was used to simulate the explosion driving process of multi-layer tungsten spherical fragments under different conditions.Relevant verification tests were carried out and the reasons for the errors between theoretical and test results were analyzed.The variation of the initial velocity of the tungsten bead fragments under different tungsten bead diameters and different fragmentation layers were discussed.The results show that the theoretical calculations agree well with the numerical and experimental results.As the number of fragments increases, the fragmentation speed will decrease, but the velocity difference between adjacent layers will be larger.As the diameter of the tungsten beads decreases, the fragmentation speed increases, but the difference in velocity between adjacent layers is smaller.
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Received: 21 March 2019
Published: 15 August 2020
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