Effect of initiation models on the fragment velocity distribution of elliptical cross-section warhead

DENG Yuxuan; ZHANG Xianfeng; LIU Chuang; LI Pengcheng; MA Zhengwei; LIU Zihan

doi:10.11883/bzycj-2024-0041

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DENG Yuxuan, ZHANG Xianfeng, LIU Chuang, LI Pengcheng, MA Zhengwei, LIU Zihan. Effect of initiation models on the fragment velocity distribution of elliptical cross-section warhead[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0041

Citation:

DENG Yuxuan, ZHANG Xianfeng, LIU Chuang, LI Pengcheng, MA Zhengwei, LIU Zihan. Effect of initiation models on the fragment velocity distribution of elliptical cross-section warhead[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0041

Citation:

DENG Yuxuan, ZHANG Xianfeng, LIU Chuang, LI Pengcheng, MA Zhengwei, LIU Zihan. Effect of initiation models on the fragment velocity distribution of elliptical cross-section warhead[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0041

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Effect of initiation models on the fragment velocity distribution of elliptical cross-section warhead

doi: 10.11883/bzycj-2024-0041

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2024-01-29
Rev Recd Date: 2024-03-20

Available Online: 2024-03-21

Abstract

Abstract

To investigate the velocity distribution characteristics of elliptical section warhead (ECSW) fragments under different initiation modes, a numerical simulation model was established for five ECSWs with different shape ratios. Numerical simulations were conducted to investigate the velocity distribution and energy output characteristics of fragments from ECSW under five different initiation modes: central single-point initiation, dual-point initiation at the midpoint of the minor (or major) axis, four-point initiation at the midpoint of the major and minor axes, as well as surface-initiated detonation. The research findings suggest that the maximum radial velocity of fragments follows a consistent logarithmic growth pattern in the radial direction across various initiation modes, increasing from the major axis to the minor axis direction. With an increase in the shape ratio, the difference in fragment velocities between the major and minor axis directions gradually decreases. However, the maximum velocity profiles of fragments from elliptical section warheads exhibit noticeable differences in average velocities under different initiation modes. Surface-initiated detonation produces the highest average radial velocity, whereas single-point initiation leads to the lowest. As the number of initiation points increases, the overall average fragment velocity on the maximum velocity profile gradually rises. In the axial direction, the influence of rarefaction waves leads to the maximum fragment velocities occurring near the 1/4 position from the non-initiating end at different azimuthal angles. Initiation points along the minor axis enhance the fragment velocity in the major axis direction near the initiating end compared to initiating points along the major axis. However, there are no significant variations in the axial velocity distribution of fragments in the minor axis direction. The different initiation modes have negligible effects on the energy output characteristics of elliptical section charges. Approximately 27% of the charge energy is converted into shell kinetic energy, while 50% is dissipated through casing fracture deformation and air shock wave propagation.
- elliptical cross-section warhead,
- detonation drive,
- fragment velocity,
- initiation model,
- energy output

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References(34)

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