中国物理B ›› 2022, Vol. 31 ›› Issue (2): 24101-024101.doi: 10.1088/1674-1056/ac2f2d

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Generation of laser-driven flyer dominated by shock-induced shear bands: A molecular dynamics simulation study

Deshen Geng(耿德珅)1, Danyang Liu(刘丹阳)1,2,†, Jianying Lu(鲁建英)1, Chao Chen(陈超)2, Junying Wu(伍俊英)1, Shuzhou Li(李述周)2, and Lang Chen(陈朗)1   

  1. 1 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
    2 School of Materials Science and Engineering, Nanyang Technological University, Singapore
  • 收稿日期:2021-08-06 修回日期:2021-09-01 接受日期:2021-10-13 出版日期:2022-01-13 发布日期:2022-01-18
  • 通讯作者: Danyang Liu E-mail:ldybit@bit.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11832006) and the Opening Fund of State Key Laboratory of Explosion Science and Technology in China (Grant No. KFJJ20-04M).

Generation of laser-driven flyer dominated by shock-induced shear bands: A molecular dynamics simulation study

Deshen Geng(耿德珅)1, Danyang Liu(刘丹阳)1,2,†, Jianying Lu(鲁建英)1, Chao Chen(陈超)2, Junying Wu(伍俊英)1, Shuzhou Li(李述周)2, and Lang Chen(陈朗)1   

  1. 1 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
    2 School of Materials Science and Engineering, Nanyang Technological University, Singapore
  • Received:2021-08-06 Revised:2021-09-01 Accepted:2021-10-13 Online:2022-01-13 Published:2022-01-18
  • Contact: Danyang Liu E-mail:ldybit@bit.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11832006) and the Opening Fund of State Key Laboratory of Explosion Science and Technology in China (Grant No. KFJJ20-04M).

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摘要： High-power pulsed lasers provide an ingenious method for launching metal foils to generate high-speed flyers for high-pressure loading in material science or aerospace engineering. At high-temperature and high-pressure laser-induced conditions, the dynamic response of the metals and the mechanism of flyer formation remain unclear. In this study, the overall process of the laser-driven aluminum flyer, including laser ablation, rupture of metal foil, and the generation of the flyer was investigated by molecular dynamics combined with the two-temperature model. It was found that under high laser fluence (over 1.3 J/cm2 with 200-fs laser pulse duration), the laser induced a shock wave with a peak pressure higher than 25 GPa, which led to shear bands expanding from the edge of the laser ablation zone in the foil. Compared with the cases of low laser fluence less than 0.5 J/cm2, the shear band induced by high laser fluence promotes the rupture of the foil and results in a high-speed flyer (> 1 km/s) with better flatness and integrity. In addition, the shock wavefront was found to be accompanied by aluminum crystal phase transformation from face-centered cubic (FCC) to body-centered cubic structure. The crystal structure reverts with the decrease of pressure, therefore the internal structure of the generated flyer is pure of FCC. The results of this study provide a better understanding of the laser-induced shock effect on the foil rupture and flyer quality and forward the development of the laser-driven flyer.

关键词: laser-aluminum interaction, laser-induced shock wave, phase transition

Abstract: High-power pulsed lasers provide an ingenious method for launching metal foils to generate high-speed flyers for high-pressure loading in material science or aerospace engineering. At high-temperature and high-pressure laser-induced conditions, the dynamic response of the metals and the mechanism of flyer formation remain unclear. In this study, the overall process of the laser-driven aluminum flyer, including laser ablation, rupture of metal foil, and the generation of the flyer was investigated by molecular dynamics combined with the two-temperature model. It was found that under high laser fluence (over 1.3 J/cm2 with 200-fs laser pulse duration), the laser induced a shock wave with a peak pressure higher than 25 GPa, which led to shear bands expanding from the edge of the laser ablation zone in the foil. Compared with the cases of low laser fluence less than 0.5 J/cm2, the shear band induced by high laser fluence promotes the rupture of the foil and results in a high-speed flyer (> 1 km/s) with better flatness and integrity. In addition, the shock wavefront was found to be accompanied by aluminum crystal phase transformation from face-centered cubic (FCC) to body-centered cubic structure. The crystal structure reverts with the decrease of pressure, therefore the internal structure of the generated flyer is pure of FCC. The results of this study provide a better understanding of the laser-induced shock effect on the foil rupture and flyer quality and forward the development of the laser-driven flyer.

Key words: laser-aluminum interaction, laser-induced shock wave, phase transition

中图分类号:  (Laser-driven acceleration?)

  • 41.75.Jv
02.70.Ns (Molecular dynamics and particle methods) 47.40.Nm (Shock wave interactions and shock effects)