The shock-induced microjet phenomenon has attracted much attention due to its importance in shock compression science and technology. The existing researches have shown that shockwave profile has a significant effect on the microjet formation. This work investigates the influence of shock pulse duration on the microjet systematically based on smoothed particle hydrodynamics simulations and theoretical analysis. In fact, when the pulse duration of shock wave is more than 7.31 times the time of shock front passing through groove, the microjet mass and its time-space evolution will be consistent with the case under supported shock. It is shown that there is a critical value for the shock pulse duration (about 4.21 times the time of shock front passing through groove), below which the effect of shock pulse duration is distinct. With decreasing the shock pulse duration, the mass from spike to bubble experiences a rapid increase due to the increase of the velocity gradient behind the ...

中文翻译：

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在不同脉冲持续时间的冲击波作用下，铝的沟槽表面形成的微射流

冲击引起的微射流现象由于其在冲击压缩科学和技术中的重要性而备受关注。现有研究表明，冲击波剖面对微射流的形成有重要影响。这项工作基于平滑粒子流体动力学模拟和理论分析，系统地研究了冲击脉冲持续时间对微射流的影响。实际上，当冲击波的脉冲持续时间大于冲击前沿通过凹槽的时间的7.31倍时，微射流质量及其时空演化将与支撑冲击下的情况一致。结果表明，冲击脉冲持续时间有一个临界值（约为冲击前沿通过凹槽的时间的4.21倍），在该临界值以下，冲击脉冲持续时间的影响就很明显。