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利用ABAQUS数值模拟软件对脉宽为ns量级的强激光诱导的应力波在铜靶中传播特性进行了模拟研究。建立了适合于高压高应变率下一维平面应力波在铜靶中传播的有限元分析模型,模拟了两种不同激光冲击波峰值压力诱导的应力波在铜靶中衰减的特性。结果显示,峰值压力为0.35 GPa和3.5 GPa下驱动的应力波在铜靶中的传播速度分别为4 600 m/s,4 000 m/s。峰值压力为3.5 GPa冲击波在靶体内诱导的应力波出现了弹性波和塑性波的双波结构。应力波峰值的衰减规律呈指数形式衰减。模拟计算的结果与理论和实验结果较为一致。
Using ABAQUS numerical simulation software, the propagation characteristics of strong laser-induced stress wave in copper target with pulse width of ns were simulated. A finite element model suitable for the propagation of one-dimensional plane stress waves in copper target under high pressure and high strain rate was established. The attenuation characteristics of stress wave induced by two kinds of laser shock wave peak pressure in copper target were simulated. The results show that the stress waves propagating at 0.35 GPa and 3.5 GPa in the copper target have a velocity of 4 600 m / s and 4 000 m / s, respectively. The peak pressure of 3.5 GPa shock wave in the target induced stress wave appeared elastic wave and plastic wave dual wave structure. The decay law of stress wave peak decays exponentially. The simulation results are in good agreement with the theoretical and experimental results.