基于修正BW模型的战斗部爆炸破片形成机理研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (15) : 118-123.

论文

李营1,2，吴卫国1，杜志鹏2，张玮2，张春辉2，张磊1

作者信息 +

Fragmentation mechanism research of warhead based on modified BW model

Li Ying1,2, Wu Wei-guo1,Du Zhi-peng2, Zhang Wei2,Zhang Chun-hui2,Zhang Lei1

Author information +

文章历史 +

摘要

膨胀环是研究战斗部爆炸破片形成机理的重要手段。本文通过引入修正的B-W内聚力断裂模型ABAQUS子程序，开展了膨胀环碎裂过程的数值仿真计算，并将整个膨胀碎裂过程划分为四个阶段，并讨论了膨胀速度对破片质量分布和破片数量的影响，进一步研究了厚度对碎裂模式的影响。得到以下结论：（1）膨胀碎裂过程可以分为整体塑性、稳定颈缩、局部颈缩发展和最终碎裂形成四个阶段；（2）破片数量随着初始膨胀速度增加而增大，且质量分布服从Rayleigh分布；（3）径厚比的变化改变了变形后期的应力状态，薄壳结构的应力以受拉为主，而厚壳结构后期出现剪切应力状态从而使得断裂模式由拉伸径缩失效逐渐过渡到剪切失效。

Abstract

Expanding ring is a useful method to study warhead fragments.The material behavior is studied based on the correction cohesion fracture model through ABAQUS subroutine. The fragmentation process is simulated and obviously divided into four stages; the quality distribution laws and the quantity of fragments influenced by expanding speed are discussed, as well as the fragmentation model affected by the thickness of the ring is studied. Indeed, the fragmentation process started from overall plastic deformation, then steady necking, and then local necking developing, finally fragmentizing. The results have shown that the quantity of fragments would increase with the initial expanding speed and the quality distribution of fragments would obey Rayleigh distribution law; finally the stress state and fragmentation model would be affected by the radius-thickness ratio

导出引用

李营1,2，吴卫国1，杜志鹏2，张玮2，张春辉2，张磊1. 基于修正BW模型的战斗部爆炸破片形成机理研究[J]. 振动与冲击, 2017, 36(15): 118-123

Li Ying1,2, Wu Wei-guo1,Du Zhi-peng2, Zhang Wei2,Zhang Chun-hui2,Zhang Lei1. Fragmentation mechanism research of warhead based on modified BW model[J]. Journal of Vibration and Shock, 2017, 36(15): 118-123

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