混凝土靶体尺寸对过载影响的数值研究  

Numerical Study of the Effect of Concrete Target’s Diameter on Deceleration

作　　者：韩丽[1] 高世桥[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《计算机仿真》2007年第6期17-19,26,共4页Computer Simulation

摘　　要：防护工程和武器设计过程中经常需开展弹冲击有限厚混凝土靶的实验,但价格昂贵,周期长,因此可否用直径较小的靶板开展实验来获得瞬态量是值得研究的一个问题。利用LS-DYNA有限元软件对上述问题进行了研究,数值模拟中的混凝土材料模型计算参数根据实验确定。数值计算结果表明,随着靶体尺寸减小,靶板破坏越来越严重,但过载、剩余速度等瞬态量变化不大,这说明当进行只关心过载的混凝土靶贯穿实验时,可采用较小尺寸的混凝土靶板,这一结论可为实验设计等提供参考。同时可看到若材料参数选取得当,则数值模拟方法处理弹丸冲击混凝土问题是有效的。The experiments of a perforating the finite concrete targets with a projectile are needed in protective engineering and weapon design. But these experiments are expensive and the period is long. Thus whether the concrete targets with smaller diameter can be used in experiments to get instantaneous variables is worth studying. This problem is studied in this paper by using LS - DYNA software, The concrete material model parameters are decided based on the tests conducted for perforation of a projectile against concrete target. The simulation results show that the target＇s damage is more severe as target＇s diameter decreases, but there are negligible changes in the deceleration curves and residual velocity. It implies that concrete targets with smaller size can be applied to concrete perforation experiments. The results presented by this paper can provide some references for the experiments or design of perforating concrete target. The simulation results also show that the simulation method is valid for dealing with concrete impact problems if material parameters are decided annronriatelv.

关 键 词：数值模拟 过载 侵彻弹 混凝土靶 

分 类 号：O385[理学—流体力学]