Experiments and numerically modeling of dynamic buckling of magnetically imploding metallic liner
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摘要: 用实验及数值模拟方法研究了电磁内爆套筒的屈曲响应规律。用电容器组脉冲发生器装置作为驱动源，设计4种不同材料、不同尺寸的金属套筒，通过调节电容器组的充电电压得到不同的加载电流，研究材料及几何参数、加载脉冲特性对套筒屈曲的影响；采用瞬态非线性有限元方法对实验结果进行了数值模拟。研究表明，在同样加载电流作用下相同材料套筒形成的屈曲波数随半径/厚度比增大而增大，不同材料套筒的屈曲波数随屈服强度/塑性强化模量比值增大而增大，而相同材料的屈曲波数不随加载电流的大小而改变；模拟计算结果与实验结果基本吻合。Abstract: The dynamic buckling of the implosion liners driven by magnetic pressure has been investigated experimentally and numerically. The study of the effect of material properties and dimensions and loading currents on liner buckling, using a capacitor bank as a driver, indicates that the mode number for buckling increases with the ratio of radius to thickness of a liner, and the yield strength to plastic hardening modulus, but keeps invariable with the increase of loading current, and that the magnitude of buckling increases with the loading current. The numerical simulation to the experimental results by an instant non-linear finite element method, shows basically an agreement between them.
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Key words:
- solid mechanics /
- buckling /
- electromagnetic implosion /
- metal liner /
- FP-1 setup /
- mode number for buckling
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