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首页> 外文期刊>Journal of Applied Physics >Atomic-scale dynamics calculation of the formation of a flyer due to the shock wave induced by multi-pulse laser
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Atomic-scale dynamics calculation of the formation of a flyer due to the shock wave induced by multi-pulse laser

机译：由多脉冲激光引起的冲击波引起的传单形成的原子尺度动力学计算

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摘要

Laser-driven flyer technology is a new dynamic high-pressure loading approach for accelerating metal as a high-speed flyer. The flyer velocity can be effectively increased using a multi-pulse laser. However, the effect of interactions between the multi-pulse laser and the metal foil on flyer formation is not clear. Based on atomic-scale dynamics combined with the two-temperature model, this paper models for the first time the entire process of using a multi-pulse laser to form a high-speed flyer. It was found that the velocity, thickness, and integrity of the flyer are different for multi-pulse than for single pulse. For a fixed number of pulses, the velocity and integrity of the flyer can be increased by appropriately increasing the delay time. However, if the delay time is too long, the shock wave generated by the second pulse will cause the flyer to suffer from secondary shock loading, and the integrity of the flyer is destroyed. If the delay time between each laser beam is fixed, the energy of each beam and the resulting pressure of the shock wave can be reduced by increasing the number of pulses. In this case, the flyer does not undergo strong impact loading and the integrity of the flyer is improved. The shock wave caused by laser pulse can result in the crystal transformation from FCC to BCC or HCP, which enhances the formation of flyer. The results of this study are important for understanding the dynamic response of a metal subjected to a multi-pulse laser and for developing laser-driven flyer technology.
机译：激光驱动的传单技术是一种新的动态高压负载方法，可加速金属作为高速传单。可以使用多脉冲激光有效地增加传单速度。然而，多脉冲激光与飞行物形成上的金属箔之间的相互作用的影响尚不清楚。基于原子尺度动态与双温模型相结合，本文首次使用多脉冲激光形成高速传单的整个过程。发现传单的速度，厚度和完整性对​​于多脉冲而不是单脉冲不同。对于固定数量的脉冲，通过适当地增加延迟时间，可以增加飞行器的速度和完整性。然而，如果延迟时间太长，第二脉冲产生的冲击波将导致传单遭受二次冲击载荷，并且传单的完整性被摧毁。如果每个激光束之间的延迟时间是固定的，则可以通过增加脉冲的数量来减小每个光束之间的能量和冲击波的所得压力。在这种情况下，传单不会发生强烈的冲击载荷，并且传单的完整性得到改善。由激光脉冲引起的冲击波可能导致FCC到BCC或HCP的晶体变换，从而增强了传单的形成。该研究的结果对于了解经受多脉冲激光器的金属的动态响应以及用于开发激光驱动的传单技术的重要性。

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  • 来源
    《Journal of Applied Physics》 |2021年第20期|204302.1-204302.12|共12页
  • 作者

    Deshen Geng; Lang Chen; Danyang Liu; Pin Zhao; Jianying Lu; Dunying Wu;

  • 作者单位

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China School of Materials Science and Engineering Nanyang Technological University Singapore 639798;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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