Penetration of a hypervelocity shaped charge into layered and spaced concrete targets

Xu, Wenlong; Wang, Cheng; Yuan, Jianming; Goh, Wooi-Boon

doi:10.1007/s40430-020-2179-8

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…The specific expression of the Johnson–Cook constitutive model is as follows 9,14 :

{\sigma }_{y}=({A}_{2}+{B}_{2}{\bar{\varepsilon }}^{pn})(1+c\,\mathrm{ln}\,{\dot{\varepsilon }}^{* })(1-{T}^{* m})

where A 2 , B 2 , c , n , and m are constants.

{\bar{\varepsilon }}^{p}

is the equivalent plastic strain.…”

Section: Numerical Model Of the Process Of Penetrating Rocksmentioning

confidence: 99%

“…E 0 is the initial internal energy. The Grunesen constitutive model of red copper and the parameters of the state equation are detailed in Table 4 9 …”

Section: Numerical Model Of the Process Of Penetrating Rocksmentioning

confidence: 99%

“…It was concluded that the increase in concrete strength will significantly reduce the penetration capacity of shaped charge, and the Allison–Vitali equation is modified for rocks. In terms of shaped charge parameter optimization, Xu et al 9 developed a hypervelocity shaped charge and used experimental methods to study its ability to penetrate layered and spaced concrete. Based on this, the structural parameters of hypervelocity shaped charge were optimized.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the process of perforating hard roof in an innovative technology of directional roof‐cutting by composite blasting

Tai

et al. 2023

Energy Science & Engineering

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The hard roof in coal mines will induce strong pressure problems for the working face and the lanes, which will seriously affect the safe and efficient production of the mine. For these issues, our team developed a new technology of cutting hard roof by composite blasting. With the new technology, a penetrating process is key to the directionally cut roof. Thus, an arbitrary Lagrange–Euler method is proposed to calculate the penetrating process. In this method, it was taken that the Jones–Wilkins–Lee constitutive model, Johnson–Cook constitutive model, and Holmquist–Johnson–Cook constitutive model to build a numerical model, by LS‐DYNA software, of the process of the penetrating the hard roof. Finally, the following conclusions were obtained: (1) The velocity variation law of metal liner from head to tail is revealed. The speeds of the metal liner's head and tail are 3500 and 450 m/s, respectively. (2) The shape of the channel formed by shaped charge jets is like a funnel, whose mouth's depth and diameter are 33 and 49 mm, respectively. The funnel's narrow diameter is 7.5 mm. (3) With the increase of the channel depth, the rock damage area changes in three different states: slow increase, rapid increase, and linear increase. Then, a shovel‐shaped geometric model of rock damage zone is established, whose key size parameters in the model are given.

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“…The specific expression of the Johnson–Cook constitutive model is as follows 9,14 :

{\sigma }_{y}=({A}_{2}+{B}_{2}{\bar{\varepsilon }}^{pn})(1+c\,\mathrm{ln}\,{\dot{\varepsilon }}^{* })(1-{T}^{* m})

where A 2 , B 2 , c , n , and m are constants.

{\bar{\varepsilon }}^{p}

is the equivalent plastic strain.…”

Section: Numerical Model Of the Process Of Penetrating Rocksmentioning

confidence: 99%

“…E 0 is the initial internal energy. The Grunesen constitutive model of red copper and the parameters of the state equation are detailed in Table 4 9 …”

Section: Numerical Model Of the Process Of Penetrating Rocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the process of perforating hard roof in an innovative technology of directional roof‐cutting by composite blasting

Tai

et al. 2023

Energy Science & Engineering

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show abstract

“…The penetration depth of this shaped charge in the three-layered steel target was 6.1% more than the typical shaped charge. Also, in another study (Xu et al, 2020), they investigated the performance of these shaped charges against multi-layered and discrete concrete targets. For the optimal thickness of the tungsten disk (7.5 mm), the penetration depth of the hyper-velocity shaped charge was 31.3% higher than the typical shaped charge.…”

Section: Hypervelocity Shaped Chargesmentioning

confidence: 99%

A practical review study on shaped charge in the last two decades (2000–2020)

Mehmannavaz

Ramezani

Nabakhteh

et al. 2021

International Journal of Protective Structures

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Shaped charges are devices used for cutting or penetrating different aerial, on land, and underwater targets, based on the concentration of the explosion energy to the liner. The purpose of this study is to present a practical review of the studies related to shaped charges in the last twenty years (2000–2020). In this regard, these studies have been reviewed in two different categories for ordinary and advanced shaped charges. In the case of ordinary shaped charges, different aspects including shaped charges against different targets, different types of shaped charges (such as linear shaped charge and explosively formed penetrators), and theoretical advancements are presented. On the other hand, the new kinds of shaped charges developed for a specific purpose are introduced in the case of advanced shaped charges. The survey of the literature indicates that different concepts such as cut-off velocity and theoretical applicability of hydrodynamics theory in shaped charge penetration still Requires effort. Also, few studies have been focused on new shaped charges, such as hyper-velocity shaped charges, annular and dual-mode ones; and the field is still open for further progress. Besides, some of these new shaped-charges, such as double-layer shaped charges, are not realistic enough to be produced for practical purposes or the market.

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“…Zhang and Jin (2020) carried out simulation studies with shaped charge jets to determine bulge and burr heights. Xu et al (2020) presented a comparative study of penetration performances of conical shaped charge and hypervelocity shaped charge into concrete target with experimental and numerical studies. Zhu et al (2020) proposed a semi-empirical model to determine penetration depth and cavity diameters of shaped charge jet into concrete targets.…”

Section: Introductionmentioning

confidence: 99%

Effect of fragment impact on shaped charge jet formation and penetration into steel target

Hafizoglu

Konokman

Kesemen

et al. 2022

WJE

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Purpose This paper aims to investigate the effects of fragment impacts to shaped charge warheads in terms of shaped charge jet formation geometries and penetration performances. Design/methodology/approach In experimental process, a fragment was accelerated to a shaped charge warhead by means of a powder gun to a velocity more than 1,000 m/s, and this impact led to conical damage in the explosive of the warhead. Deformation on the warhead was visualized using X-ray technique to observe holes generated during fragment impact. Penetration test was performed against AISI 1040 steel plates with the damaged shaped charge warhead. Penetration performance of shaped charge jet, which deviated from the symmetry axis, was simulated by using SPEED software with 3-D Eulerian method to validate the numerical modelling method by comparing penetration test and simulation results of damaged warhead. Findings Simulation and test results showed good correlation for the warhead in terms of penetration depth and hole geometry at the impact surface of steel plates. In addition, the effects of the numbers and the geometries of fragment holes on shaped charge jet penetration performances were investigated with validated numerical methods. Simulation results showed that the increase in the number of fragment holes in the explosive of the warhead led to particulation of shaped charge jet that diminished penetration depth in the target plate. Additionally, simulation results also showed that the fragment hole geometry in the explosive after different fragment impact angles affected the amount of jet deviation from the symmetry axis as well as penetration depth in the target plate. Practical implications The results obtained from the current study revealed that fragment impact angle and different number of fragment impact reduced the penetration performance of shaped charge warhead by influencing the symmetry of shaped charge jet negatively. Originality/value The current study fulfils the need to investigate how fragment impact on the shaped charge warhead affect the formation symmetry of shaped charge jet as well as penetration performance by experimental and numerical methods. Penetration performance result of asymmetric jet is compared by experimental and numerical studies. A detailed methodology on numerically modelling of the effect of fragment impact angle and number of fragment impact on shaped charge jet performance is given in this study.

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Penetration of a hypervelocity shaped charge into layered and spaced concrete targets

Cited by 7 publications

References 17 publications

Investigation of the process of perforating hard roof in an innovative technology of directional roof‐cutting by composite blasting

Investigation of the process of perforating hard roof in an innovative technology of directional roof‐cutting by composite blasting

A practical review study on shaped charge in the last two decades (2000–2020)

Effect of fragment impact on shaped charge jet formation and penetration into steel target

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