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Scratch defects modulated hot spots generation in laser irradiated RDX crystals: a 3D FDTD simulation

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Abstract

Insights into the interaction between laser and energetic materials offer possibility of manipulating and initiating explosives in a more precise, controllable way. Herein, we investigate the interaction between laser and cyclotrimethylene trinitramine (RDX) energetic crystals with scratch defects in the framework of three-dimensional finite difference time domain. Modulation effects on the hot spot formations have been explored for single scratch of parabolic/triangular geometries as well as two-scratch combination in parallel and intersecting configurations. The calculation results disclose that for single scratch, the width of scratch affects more on the light intensification than its depth. Meanwhile, scratch defects of triangular geometry exhibit stronger modulation effect than the parabolic ones. For two-scratch combinations, including both parallel and intersecting configurations, a coupling effect is found to promote generation of hot spots under laser irradiation. In particular, the triangular & triangular interaction presents largest enhancement on light intensification among diverse configurations. It also reveals that RDX crystals are more easily initiated when the intervals between two parallel scratches are appropriate (λ–4λ), or the intersecting scratches are perpendicular with each other. This work offers a primary inspiration for better understanding the formation of hot spots under laser irradiation and provides practical guideline for the surface quality managements of explosive materials.

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Acknowledgements

This study was financially supported by the NSAF Joint Foundation of China (No. U1330108), the National Natural Science Foundation of China (Nos. 11304209, 11372289), the Project Sponsored by the China Scholarship Council (No. 201506075044), the Fundamental Research Funds for the Central Universities (ZYGX2014J035), and the Start Science Foundation of UESTC (No. Y02002010401084)

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Authors and Affiliations

  1. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Zhonghua Yan, Wei Liu, Xia Xiang, Zhijie Li, Li Li & Xiaotao Zu

  2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, China

    Zhonghua Yan, Chuanchao Zhang, Wei Liao, Hongwei Yan & Xiaodong Yuan

  3. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China

    Jinshan Li, Ming Huang, Zongwei Yang & Bisheng Tan

  4. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Xiaotao Zu

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  1. Zhonghua Yan
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  2. Wei Liu
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  3. Chuanchao Zhang
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  4. Jinshan Li
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  5. Xia Xiang
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  7. Wei Liao
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  11. Li Li
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  12. Hongwei Yan
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  13. Xiaodong Yuan
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  14. Xiaotao Zu
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Correspondence to Wei Liu, Xiaodong Yuan or Xiaotao Zu.

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Yan, Z., Liu, W., Zhang, C. et al. Scratch defects modulated hot spots generation in laser irradiated RDX crystals: a 3D FDTD simulation. J Mater Sci 51, 8812–8823 (2016). https://doi.org/10.1007/s10853-016-0086-2

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  • DOI: https://doi.org/10.1007/s10853-016-0086-2

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