破片尺寸对空爆冲击波及破片传播过程的影响仿真分析

Simulation analysis of effects of single fragment size on air-blast wave and fragment propagation

    摘要
  • 摘要:
      目的  为探讨高速破片与空爆冲击波相互作用下冲击波与高速破片的传播规律以及速度和能量衰减机制，
      方法  采用ANSYS/LS-DYNA软件建立端部贴有预制破片的柱状TNT空爆仿真模型。在破片总质量相同的情况下，改变单个预制破片尺寸，研究破片群单个破片尺寸对冲击波及破片自身传播过程的影响。
      结果  结果表明，预制破片群会阻碍破片正后方冲击波的传播，较大程度地降低冲击波的强度和传播速度；在破片群总质量相同的情况下，单个破片尺寸对冲击波传播的影响差异不大；破片群的单个破片尺寸越小，破片群获得的初始总动能越高，但破片速度衰减越快。
      结论  因此，在空爆冲击波和高速破片联合作用的研究中，应主要考虑爆炸产生的破片尺寸差异对高速破片载荷的影响。这一结论可为战斗部空爆载荷特性及载荷联合作用研究提供参考。

     

    Abstract:
      Objectives  This paper involves the propagation and attenuation of the velocity and energy of air-blast waves and high-velocity fragments while taking their combined effects into account.
      Methods  With ANSYS/LS-DYNA software, a simulation model of a columnar TNT air blast is built with prefabricated fragments affixed to its end. When the total quality of fragments is constant, the effects of a single fragment's size on the propagation of the air-blast wave and fragments are studied by changing the size of the single fragment.
      Results  The results show that fragments greatly reduce the intensity and velocity of a shockwave, and block the air-blast waves behind them. When the total quality of the fragments remains constant, the effects of single fragment size on blast shockwave propagation characteristics show little difference. The smaller the single fragment, the more kinetic energy the fragments will have and the faster that energy will dissipate.
      Conclusions  As a result, more attention should be paid to the combined effects of air-blast waves and high-velocity fragments. Such research can provide reference points for the deeper study of blast loads and their interaction.

     

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