Microjetting is induced by the interaction between incident shock wave and material free surface. Moreover, spike velocity is one of the most important parameters to quantify the microjetting processes. The spike velocity over a wide range of shock and surface conditions for aluminum and tin is achieved via systematical Eulerian peridynamic simulations. The four popular spike velocity models are assessed according to the simulation data. The results indicate that the model proposed by Dimonte based on Richtmyer–Meshkov instability (RMI) mechanism is in best agreement with the simulated spike velocities. The further analysis highlights that the dependence of adiabatic index on material states should be taken into account because it can impact the RMI flows. Then an improved spike velocity model is proposed and the comparative investigations indicate that it exhibits an overall better prediction compared to the original velocity model.

中文翻译：

---

冲击负载铝和锡微喷射尖峰速度的数值研究


微喷射是由入射冲击波与材料自由表面之间的相互作用引起的。此外，峰值速度是量化微喷射过程的最重要参数之一。铝和锡在各种冲击和表面条件下的尖峰速度是通过系统的欧拉近场动力学模拟获得的。根据模拟数据评估四种流行的尖峰速度模型。结果表明，Dimonte 提出的基于 Richtmyer-Meshkov 不稳定性（RMI）机制的模型与模拟的尖峰速度最为一致。进一步的分析强调，应考虑绝热指数对材料状态的依赖性，因为它会影响 RMI 流动。然后提出了一种改进的尖峰速度模型，比较研究表明，与原始速度模型相比，它表现出总体更好的预测。