Cohesiveness and penetration performance of jet: Theoretical, numerical, and experimental studies

Shi, Jin; Huang, Zhengxiang; Zu, Xudong

doi:10.1016/j.ijimpeng.2023.104543

Cited by 5 publications

(1 citation statement)

References 55 publications

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“…To mitigate errors arising from the attenuation of jet penetration velocity, this study employed the AUTODYN solver to numerically simulate the process of a projectile penetrating a liquid composite protective structure at a constant velocity. AUTODYN is a numerical simulation software that utilizes the explicit finite element method and is frequently used for simulating and calculating problems related to high-speed impacts (Zhu et al 2019) shaped charge jet formation (Gu et al 2022, Shi et al 2023) and wave propagation (Zhang et al 2023, Yang et al 2023. Through simulation, the propagation process of the shockwave in the liquid during the projectile's penetration into the liquid composite protective structure was obtained.…”

Section: Simulation Analysismentioning

confidence: 99%

Study on cone angle of shockwave front in liquid composite protective structure

Cai,

Tan,

et al. 2024

Lat. Am. j. solids struct.

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Liquid composite armor has demonstrated excellent performance in protecting against shaped charge jets. Currently, most existing theoretical calculation models for the velocity range of the disturbed jet approximate the cone angle of the shockwave front as the Mach angle. However, indiscriminately equating the cone angle of the shockwave front with the Mach angle can lead to significant errors in the calculated velocity range of the disturbed jet. To address this issue, this study focuses on investigating the variation of the cone angle of the shockwave front within the liquid composite protective structure. Firstly, a dimensional analysis was conducted to determine the functional relationship between the cone angle of the shockwave front and relevant parameters. Then, the process of jet penetrating liquid composite protective structure was simulated by Autodyn. The results demonstrated that the normalized cone angle solely depends on the normalized diameter within the critical angle. By fitting the simulation data, the formula for calculating the cone angle of the shockwave front was derived.

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Section: Simulation Analysismentioning

confidence: 99%

Study on cone angle of shockwave front in liquid composite protective structure

Cai,

Tan,

et al. 2024

Lat. Am. j. solids struct.

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Mesoscale formation and energy release characteristics of PTFE/Al reactive jet

Zheng,

Zhang,

et al. 2024

Propellants Explo Pyrotec

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In order to investigate the mechanical formation, the mechanical‐thermo coupling mesoscale mechanism and the corresponding energy release characteristics of PTFE/Al composite material reactive jet, a mesoscale discretization model of PTFE/Al reactive liner with a mass ratio of 73.5 %/26.5 % is developed on the basis of the random delivery principle. The mesoscale numerical simulation is used to perform PTFE/Al reactive jet formation, obtaining the relative distribution characteristics of material, pressure, and temperature. The overpressure experiments for the energy release of reactive jets are conducted. The results show that there is an increasing tendency in the amount of Al particles from the jet's tip to its tail due to the velocity variance between PTFE and Al. The high temperature zones are found to be concentrated on the tip and axis of the jet, with particle deformation, collision and friction in the reactive jet accounting for the temperature rise. Moreover, the Al particle size has a significantly influence on the particle distribution and the mechanical‐thermo coupling behavior in the reactive jet, and the decrease of particle size is beneficial to the chemical reaction among the components of the reactive jet. To be more specifically, under the conditions of Al particle size of 400 μm, 600 μm and 800 μm, the overpressure peaks of reactive jet in 13 L chamber are 3.32 MPa, 2.86 MPa and 2.61 MPa, respectively. The variation of the overpressure with Al particle size obtained by experiment is consistent with the analysis of the mechanical‐thermo coupling characteristics of mesoscale numerical simulation.

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