Formation characteristics and penetration performance of an underwater shaped charge jet

Gu, Yangchen; Wang, Jinxiang; Li, Heng; Tang, Kui; Liu, Liangtao

doi:10.1016/j.oceaneng.2022.111695

Cited by 13 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…The Arbitrary Lagrangian-Euler (ALE) algorithm can accurately and efficiently solve the problem of the large deformation of structures caused by explosion [14][15][16]. Among its types, empirical methods, such as the TNT equivalent method [17] and equivalent gas explosion pressure method [18,19], are often used as the explosion sources of gas explosion.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Dynamic Response of Gas Explosion in Uneven Coal Mine Tunnels Using CESE Reaction Dynamics Model

Du,

Chen,

Zhu

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

A numerical simulation method combining the detailed chemical reaction mechanism of methane deflagration with an approximate real tunnel structure was proposed to confirm whether the unevenness of the tunnel wall during a coal mine gas explosion can be ignored. The approximate real tunnel model and smooth wall tunnel model were developed using 3D modeling methods. The propagation and attenuation processes of shock waves in the two tunnel models, as well as the different dynamic responses of the two tunnel walls, were compared and analyzed. Research results show that the non-uniformity of the tunnel wall decreases the shock wave overpressure and propagation velocity. The peak overpressure reduction value of the shock wave reaches 81.91 kPa, and the shock wave overpressure reaches its peak at an extended maximum time of 7.4 ms. The stress distribution on the approximate real tunnel wall is discontinuous, the propagation speed of stress waves in the bend tunnel is slower, and the duration of high load is relatively low. The displacement of the approximate real tunnel after gas explosion is lower than that of tunnels with smooth walls, and the displacement of most measuring points on the tunnel on the right is only 1/3–1/2 that of the smooth tunnel.

show abstract

“…For situations with structural deformation, analyzing only the explosion flow field lacks accuracy Arbitrary Lagrangian-Euler (ALE) algorithm can accurately and efficiently solve the problem of large deformation of structures caused by explosion [11][12][13]. Among them, empirical methods, such as equivalent TNT equivalent method [14] and equivalent gas explosion pressure method [15], are often used as the explosion source of gas explosion.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the dynamic response of gas explosion in uneven coal mine tunnels using LS DYNA CESE reaction dynamics model

Du,

Chen,

Zhu

et al. 2024

Preprint

View full text Add to dashboard Cite

A numerical simulation method combining detailed chemical reaction mechanism of methane deflagration with approximate real tunnel structure was proposed to confirm whether the unevenness of the tunnel wall during coal mine gas explosion can be ignored. The approximate real tunnel model and smooth wall tunnel model were developed using 3D modeling methods. The propagation and attenuation processes of shock waves in the two tunnel models, as well as the different dynamic responses of the two tunnel walls, are compared and analyzed. Research results show that the non-uniformity of the tunnel wall decreases the shock wave overpressure and propagation velocity. the peak overpressure reduction value of the shock wave reached 81.91 kPa, and the shock wave overpressure reaches its peak at an extended maximum time of 7.4 ms. The stress distribution on the approximate real tunnel wall is discontinuous, the propagation speed of stress waves in the bend tunnel is slower, and the duration of high load is relatively low. The displacement of the approximate real tunnel after gas explosion is lower than that of tunnels with smooth walls, and the displacement of most measuring points on the tunnel on the right is only 1/3–1/2 that of the smooth tunnel.

show abstract

Formation characteristics and penetration performance of an underwater shaped charge jet

Cited by 13 publications

References 22 publications

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

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

Numerical Study on the Dynamic Response of Gas Explosion in Uneven Coal Mine Tunnels Using CESE Reaction Dynamics Model

Numerical study on the dynamic response of gas explosion in uneven coal mine tunnels using LS DYNA CESE reaction dynamics model

Contact Info

Product

Resources

About