Study on the Compression Properties of Periodic Copper Wire Closed-Packed Structure
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摘要: 对铜线密排结构材料开展了一维平面应变冲击压缩实验与数值模拟研究。利用激光位移干涉仪测量了样品/窗口界面速度剖面，获取了有效的结构冲击压缩实验数据。从样品界面速度曲线可以推断，密排结构冲击压缩时没有形成致密结构，在卸载过程中发生了分层。应用光滑粒子流体动力学方法(SPH)建立了平面铜线密排结构的三维计算模型，计算得到样品冲击加载下的压缩特性，实验和数值模拟得到的界面速度和压力结果吻合较好, 为后续开展柱面铜线密排结构的冲击压缩过程研究奠定了基础。Abstract: A kind of copper wire closed-packed structure was compressed by one-dimensional strain impacting and the dynamic process was numerically simulated.The laser displacement interferometer was used to measure the interface particle velocity profile and the effective experimental data of structure impact compression were obtained.It can be inferred from the interface velocity curve that no compact structure was formed in the sample during the shock compressing progress, and the delamination of sample happened during the unloading progress.The three-dimensional numerical model of plane copper wire closed-packed structure was built by using smoothed particle hydrodynamics (SPH) method, and the shock compression properties of sample were obtained.The interface particle velocities and pressure of the sample were in good agreement between experiments and simulations.
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图 1 柱面内爆磁通量压缩实验原理图
Figure 1. Schematic of cylindrical explosive implosion magnetic flux compression experiment
图 2 三级串联式爆炸强磁场等熵加载原理示意图
Figure 2. Three cascades schematic of isentropic loading in exploded magnetic field
图 8 铜线截面SPH粒子建模图
Figure 8. Intersection surface of copper wire simulated by SPH particles
图 9 样品中铜线排列结构的建模
Figure 9. Simulation structure of the copper wire array in the sample
图 10 AUTODYN软件对冲击过程的数值模拟
Figure 10. Numerical simulation of the impact process in AUTODYN
图 12 模拟得到的铜线密排结构样品的压力曲线
Figure 12. Simulated pressure curves of copper wire closed-packed structure in experiment
图 13 铜线密排结构平板压缩形貌图
Figure 13. Morphologies of copper wire array plane plate in compression process
表 1 冲击实验中飞片、基板和窗口属性
Table 1. Properties of flyer, base board and window in the impact experiment
Parts Material Diameter
/(mm)Thickness
/(mm)Flyer OFHC 24 2 Base plate OFHC 25 2 Window Al2O3 22 6 
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表 2 4发冲击实验结果
Table 2. Experimental data of the four impact experiments
Exp.No. Sample Measured flyer
velocity/(km/s)Measured velocity
peak/(km/s)Pulse width
/(ns)Interface pressure
/(GPa)Shot 1 4 layers 2.01 1.20 455 47.5 Shot 2 4 layers 2.48 1.39 440 56.1 Shot 3 7 layers 2.00 1.19 433 47.1 Shot 4 7 layers 2.51 1.40 378 56.6
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表 3 计算结果与实验结果的比较
Table 3. The contrast between experiment results and numerical results
Exp.No. Numerical velocity peak/(km/s) Experiment Numerical Contrast Shot 1 1.20 1.10 8.3% Shot 2 1.39 1.37 1.4% Shot 3 1.19 1.12 5.9% Shot 4 1.40 1.38 1.4%
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