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Numerical study on the effect of the initiation process of cylindrical high explosives on the blast-wave behavior

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Abstract

We conducted a series of numerical simulations to understand the effect of the initiation process of cylindrical high explosives on the blast-wave behavior and peak overpressure distribution. The first case involved the explosion of a cylindrical high explosive whose length-to-diameter ratio was equal to 2 and that was vertically placed above the ground surface. The initiation point was at the top of the high explosive. The initiation process induced the detonation momentum directed from top to bottom, and the detonation products forcefully hit the ground surface, resulting in a higher peak overpressure on the ground surface in comparison with the case using an isothermal constant-pressure volume. After the blast wave expanded far from the initiation point, the computed peak overpressures of the two approaches showed good agreement with those from experiments. The second case involved the explosion of a cylindrical high explosive whose length-to-diameter ratio was unity and that was placed in air. The initiation point was the one end side of the high explosive. The blast wave was divided into three regions that originated from the detonation in the high explosive, an oblique shock wave in air, and a bridge wave connected with them, thus causing an azimuthal distribution of peak overpressure. The highest peak overpressure values were computed in the bridge wave region. To understand the propagation behavior of the blast wave, we should thoroughly observe how and when all the waves affecting the blast-wave behavior are generated and how they propagate and interact with each other.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant No. JP18K04643.

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Authors and Affiliations

  1. Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology, Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan

    Y. Sugiyama, T. Matsumura & K. Wakabayashi

  2. Department of Maritime Technology, National Institute of Technology, Toyama College, 1-2 Ebie-neriya, Imizu, Toyama, Japan

    T. Homae

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  1. Y. Sugiyama
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  2. T. Homae
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  4. K. Wakabayashi
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Correspondence to Y. Sugiyama.

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Communicated by C. Needham.

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Sugiyama, Y., Homae, T., Matsumura, T. et al. Numerical study on the effect of the initiation process of cylindrical high explosives on the blast-wave behavior. Shock Waves 31, 427–438 (2021). https://doi.org/10.1007/s00193-021-01021-x

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