尖头弹侵彻金属板花瓣型破口成形过程仿真分析

Numerical simulation analysis of petaling formation process of plate penetrated by sharp-nosed missile

    摘要
  • 摘要:
      目的  尖头弹侵彻金属板形成花瓣型破口是一种常见的毁伤模式，为分析花瓣型破口的成形过程，
      方法  将采用数值仿真手段进行分析。首先，依据前期开展的尖头弹打靶实验及靶板材料力学性能实验，建立弹靶仿真计算模型并确定输入材料参数；然后，利用仿真手段对尖头弹穿甲靶板形成花瓣型破口的过程进行分析，重点探讨花瓣型裂缝路径单元的受力状态；最后，对比分析不同失效准则对破口成型过程的影响。
      结果  结果表明：花瓣形成过程十分复杂，主要可分为碟形—隆起变形阶段、尖头弹体扩孔阶段、花瓣型裂缝形成与扩张阶段以及花瓣破口区域整体运动4个阶段；在花瓣型破口成形过程中，裂缝路径处单元应力状态变化复杂，采用常应变失效准则难以预测靶板的花瓣型破口形状，需采用考虑应力三轴度损伤的JC失效模型。
      结论  所得成果可为后续花瓣开裂理论评估改进提供一定的分析依据。

     

    Abstract:
      Objectives  The petaling of a ductile metal plate penetrated by a sharp-nosed missiles is a common damage mode. In order to analyze its formation process, numerical simulation is carried out.
      Methods  First, a simulation model of striking the metal plate by sharp-nosed missile is established on the basis of experiments involving missiles perforating targets, and the material constants are acquired from material mechanical characteristic experiments. The petaling procedure is then studied, as well as the stress states of typical elements in the petaling cracking area. The influence on the simulation results is subsequently contrasted by different failure criteria.
      Results  The results show that the petaling process is complex and can be mainly divided into four distinct stages:butterfly heaving, hole enlargement, petal appearance and expansion, and entire movement of damaged region. The stress states of the cracking area are complicated and the petaling shape cannot be sufficiently predicted by the constant strain criterion; this requires the introduction of the JC failure model which considers the influence of stress triaxiality.
      Conclusions  The results of this paper can provide references for the modification of typical petaling cracking theory and evaluation.

     

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