Stress amplification effect of PBX charge under multi-pulse loading

HE Yang; HU Qiushi; ZHONG Suyang; LIAO Shenfei; LI Tao; FU Hua

doi:10.11883/bzycj-2023-0267

Volume 44 Issue 6

Jun. 2024

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HE Yang, HU Qiushi, ZHONG Suyang, LIAO Shenfei, LI Tao, FU Hua. Stress amplification effect of PBX charge under multi-pulse loading[J]. Explosion And Shock Waves, 2024, 44(6): 062301. doi: 10.11883/bzycj-2023-0267

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HE Yang, HU Qiushi, ZHONG Suyang, LIAO Shenfei, LI Tao, FU Hua. Stress amplification effect of PBX charge under multi-pulse loading[J]. Explosion And Shock Waves, 2024, 44(6): 062301. doi: 10.11883/bzycj-2023-0267

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Stress amplification effect of PBX charge under multi-pulse loading

doi: 10.11883/bzycj-2023-0267

Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2023-08-02
Accepted Date: 2024-04-28
Rev Recd Date: 2024-02-28

Available Online: 2024-05-09

Publish Date: 2024-06-18

Abstract

Abstract

A charge is usually subjected to multi-pulse loading in the process of projectile penetration. A multi-pulse loading device for charge was proposed, and the stress amplification effect of the charge under multi-pulse loading was studied. An equivalent spring model of the multi-pulse loading device was established based on the lumped mass method. The amplification effect of the equivalent model was studied in the time and frequency domains. Based on the finite element analysis of the multi-pulse loading of the charge, the conditions for generating stress amplification were discussed. The results show that the system resonates when the multi-pulse load frequency matches the natural frequency of the charge, and the charge produces amplification response. The presence of gaps causes the main resonance frequency of the system to deviate towards the lower frequency range. The amplification factor decreases with the increase of the structural gap width. When the impact occurs near the moment when the T-shaped transmission bar and the limit block have just separated, the optimal amplification effect can be produced. Under three pulse loading conditions, the optimal amplification factor for the second and third impact is 1.7 times and 2.1 times, respectively. Multiple pulse loading experiments were conducted on Teflon and PBX explosive simulation materials. The relative motion of bullets, limit blocks, and T-shaped transmission bars was observed using high-speed photography technology. The sample pressure was measured using a PVDF (polyvinylidene fluoride) pressure gauge. The results show that stress amplification occurs when the bullet and the T-shaped transmission bar collide in the same direction, but there is no amplification effect when they collide in the opposite direction, which is consistent with the numerical simulation results. Under the condition of constant total length, the stress amplification factor of the combination of Teflon and PBX simulation material is smaller than that of Teflon due to the presence of interface gaps.
- penetration,
- multi-pulse,
- stress amplification,
- lumped mass method,
- PBX explosive

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References(31)

References

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