基于修正BW模型的战斗部爆炸破片形成机理研究  

Blast fragments forming mechanism of a warhead based on modified BW model

作　　者：李营[1,2] 吴卫国[1] 杜志鹏[2] 张玮[2] 张春辉[2] 张磊[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]海军装备研究院,北京100161

出　　处：《振动与冲击》2017年第15期118-123,共6页Journal of Vibration and Shock

基　　金：国防基础研究项目(B1420133057);国家自然科学基金(51509196);非线性力学国家重点实验室开放基金(LNM201505);中央高校基本科研业务费专项资金(2014-YB-20)

摘　　要：膨胀环是研究战斗部爆炸破片形成机理的重要手段。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。Expanding ring is a useful means to study a warhead,s blast fragments forming mechanism. Here, through introducing a modified BW cohesive force fracture model, s ABAQUS subroutine, the fragmentation process of an expanding ring was simulated numerically. The expanding fragmentation process was divided into four stages. The effects of expanding velocity on fragments, mass distribution and fragments number were discussed. The effects of thickness on the fragmentation mode were also studied. It was shown that the fragmentation process is divided into 4 stages including overall plastic deformation, steady necking, local necking developing and fragmentation; the fragments number increases with increase in the initial expanding velocity and the mass distribution of fragments obeys Rayleigh distribution ; the variation of the radius-thickness ratio changes stress status of end deformation stage, the stress of thin shell structures is mainly tensile, while the shear stress status appears in the end stage of thick shell structures, so their fracture modestransfer gradually from tension necking failure to shear failure.

关 键 词：反舰导弹 膨胀环 爆炸破片 RAYLEIGH分布 应力三轴度 

分 类 号：O389[理学—流体力学] TJ410[理学—力学]