GPa-level slow-front ramp wave loading technology driven by non-shock initiation reaction

YANG Tianhao; CHONG Tao; LI Tao; FU Hua; HU Haibo

doi:10.11883/bzycj-2022-0238

Volume 43 Issue 6

Jun. 2023

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YANG Tianhao, CHONG Tao, LI Tao, FU Hua, HU Haibo. GPa-level slow-front ramp wave loading technology driven by non-shock initiation reaction[J]. Explosion And Shock Waves, 2023, 43(6): 064101. doi: 10.11883/bzycj-2022-0238

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YANG Tianhao, CHONG Tao, LI Tao, FU Hua, HU Haibo. GPa-level slow-front ramp wave loading technology driven by non-shock initiation reaction[J]. Explosion And Shock Waves, 2023, 43(6): 064101. doi: 10.11883/bzycj-2022-0238

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GPa-level slow-front ramp wave loading technology driven by non-shock initiation reaction

doi: 10.11883/bzycj-2022-0238

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2022-05-31
Rev Recd Date: 2022-06-06

Available Online: 2022-06-07

Publish Date: 2023-06-05

Abstract

Abstract

To study the ignition behavior of micro-mesoscopic hot spots in the matrix of pressed PBXs under GPa and 10 μs-level slow-front ramp wave loading, a ramp wave loading device driven by non-shock initiation reaction of pressed PBX with heavy constraint was designed. With the help of the output pressure from the explosion reaction of the donor explosive, the acceptor explosive was loaded by a ramp wave. A two-dimensional axisymmetric finite difference program was developed based on the burn rate equation of laminar combustion on the explosive surface to guide the structural design of the device. The pressure history during the combustion process of the explosive crack surface formed by the explosive fragmentation in the late stage of the non-shock initiation reaction of the donor explosive in the device configuration and the pressure waveform acting on the acceptor explosive are analyzed. And the influence of crushing degree of donor explosive and device structure parameters (thickness of case and interlayer) on output pressure waveform during the combustion process is discussed. The calculation results show that the specific combustion surface area formed by the crushing of the donor explosive is the key factor affecting the pressure evolution of the non-shock initiation reaction. The larger the specific combustion surface area, the greater the ramp wave pressure is. The ramp wave pressure can reach above GPa, and the corresponding rising front of the pressure wave can be reduced from tens of milliseconds to several milliseconds. The thickness of the case of the donor explosive, namely the constraint strength, has a significant effect on the pressure during the non-shock initiation reaction. As the thickness of the interlayer increases, the output ramp wave pressure decays approximately exponentially. The structural design of the device was completed according to the calculation results, and the ramp wave loading experiment was carried out on the tested PBX. The pressure at the incident interface of the tested explosive measured by PVDF is 1.6 GPa, and the front of the ramp wave is 25 μs, which preliminarily proved the feasibility of realizing GPa and 10 μs-level ramp wave pressure output by using the non-shock initiation reaction of heavily constrained pressed PBX explosives.
- pressed PBX,
- heavily constraint,
- non-shock initiation reaction,
- laminar burning,
- combustion surface area,
- ramp wave load

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References(15)

References

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