Protection performance of double-layered metal shields against projectile impact

Teng, Xiaoyan; Dey, Sumita; Børvik, Tore; Wierzbicki, Tomasz

doi:10.2140/jomms.2007.2.1309

Cited by 80 publications

(42 citation statements)

References 24 publications

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“…However, 12 mm monolithic plate presented a slightly better performance for striking velocities above 850 m/s. A recent investigation by Teng et al [3,8] on the ballistic performance of monolithic and double-layered steel plates showed that the ballistic resistance depends on several factors, including projectile nose shape, projectile mass, impact velocity, configuration of the plates and material properties. Corran et al [9] found that the projectile nose shape and hardness are very important to consider because the failure mechanisms involved in the penetration process and consequently the ballistic performance are dependent upon these factors.…”

Section: Introductionmentioning

confidence: 99%

Ballistic performance of multi-layered metallic plates impacted by a 7.62-mm APM2 projectile

Flores‐Johnson

Saleh

Edwards

2011

International Journal of Impact Engineering

168

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This paper presents a numerical investigation of the ballistic performance of monolithic, double-and triple-layered metallic plates made of either steel or aluminium or a combination of these materials, impacted by a 7.62-mm APM2 projectile in the velocity range of 775-950 m/s. Numerical models were developed using the explicit finite element code LS-DYNA. It was found that monolithic plates have a better ballistic performance than that of multi-layered plates made of the same material. This effect diminishes with impact velocity. It was also found that doublelayered plates with a thin front plate of aluminium and thick back steel plate exhibit greater resistance than multi-layered steel plates with similar areal density. These predictions indicate multi-layered targets using different metallic materials should be investigated for improved ballistic performance and weight-savings. Keywords INTRODUCTIONIn recent years, the ongoing threat of ammunition and explosively-formed projectiles to civil and military structures has increased the need to optimise protective structures. Armoured shields normally consist of a monolithic high-strength metallic plate; however, multi-layered plate configurations are often used because armour materials are not always manufactured to the required thickness, and multiple layers are necessary to fabricate shields that meet design specifications [1]. Although there are a number of studies dealing with the ballistic behaviour of multi-layered plates, their scope is limited when compared to studies of monolithic plates [2][3][4]. Moreover, the study of multi-layered plates remains an open research topic since conclusive results of its effectiveness have not been obtained to date, as is remarked in recent investigations [3][4].A numerical study conducted by Zukas and Scheffler [1] shows that 31.8 mm thick monolithic steel targets exhibit greater resistance than that of multi-layered targets with equal thickness when impacted by 65-mm long hemi-spherical nosed rods with a diameter of 13 mm and an initial velocity of 1164 m/s. They found that the weakening of the multi-layered configuration is due to the reduction of bending stiffness in the structure. They also found that the reduction of resistance in multi-layered targets becomes more apparent when the number of plates is increased while keeping the total thickness constant [1], which has also been observed experimentally [5][6]. Almohandes et al. [5] reported that monolithic steel plates are more effective than multi-layered plates of the same total thickness when impacted by a 7.62-mm projectile with an initial velocity of 826 m/s.An investigation conducted by Dey et al.[2] on the ballistic resistance of Weldox 700E steel in the sub-ordnance velocity range shows that 12 mm monolithic plate has better ballistic performance against ogival projectiles when compared with double-layered plates with same thickness, while the opposite effect is observed when blunt projectiles are used. Borvik et al. [7] studied experimentally the...

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Section: Introductionmentioning

confidence: 99%

Ballistic performance of multi-layered metallic plates impacted by a 7.62-mm APM2 projectile

Flores‐Johnson

Saleh

Edwards

2011

International Journal of Impact Engineering

168

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“…Very generally, the performance of multi-layer armor is affected by the shape of the projectile, with blunt ogives being more easily defeated [1,43]. The impact-induced phase transition, which is a primary source of energy dissipation for the designs herein, relies on rapid compression of the polymer coating by the projectile.…”

Section: Methodsmentioning

confidence: 99%

“…The impact resistance of multiple thin metallic plates has been found to be better [1,2] or worse [3,4] than that of fewer thick plates, the relative performance depending on the materials, their arrangement, and the shape of the projectile ogive [5,6,7]. Polymers are eight times less dense than steel and thus an obvious route to lighter structures.…”

Section: Introductionmentioning

confidence: 99%

Elastomer-metal laminate armor

et al. 2016

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• Polymer-aluminum laminates on the strike-face of steel plates enhance ballistic performance.• With judicious selection of substrate and laminate, a broad range of performance and weight combinations can be obtained.• There is both a reduction in magnitude of the substrate deformation and spatial dispersion of the impact.• The main function of the metallic layers is to stiffen the polymer without affecting the latter's viscoelasticity response. A study was carried out of pressure wave transmission and the ballistic penetration of steel substrates incorporating a front-face laminate, the latter consisting of alternating layers of thin metal and a soft polymer; the latter undergoes a viscoelastic phase transition on impact. The ballistic properties of laminate/steel structures are substantially better than conventional military armor. This enhanced performance has three origins: large energy absorption by the viscoelastic polymer, a significant strain-hardening of the material, and lateral spreading of the impact force. These mechanisms, active only at high strain rates, depend on the chemical structure of the polymer but not on the particular metal used in the laminate. G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f oPublished by Elsevier Ltd.

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“…Teng et al, [10] evaluated the effect of projectile with different nose shape and weight shot on monolithic and double-layered plate by using the finite element method. The result of the simulation showed that the double-layered plate was more ballistic resistant 8.0%-25.0 % for the flatnose projectile, compared to the monolithic plate of the same weight.…”

Section: Introductionmentioning

confidence: 99%

Effect of Soft-hard Plate and Rubber Sandwich Against on 5.56 mm Deformable Projectile

Purwanto¹,

Soenoko²,

Purnowidodo³

et al. 2018

JESTR

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In this paper, the effect of soft-hard plate and rubber thickness as absorbent impact against on ballistic resistance with 5.56 x 45 mm caliber deformable projectile is investigated. The characteristic of ballistic impact for each configuration target is obtained and compared based on the investigation of the hardness effect of the front plate and the thickness of rubber. The experimental results approached by simulation with finite element method were used to know several characters due to the ballistic impact. The experiment and simulation results showed that the projectile is able to perforate front plate and the impact on the back plate form a bulge on every configuration. The configuration of hard plate as front plate reveals minimum ballistic impact due to the projectile rate. The simulation shows that the maximum stress concentration occurs only on the front plate, so the front plate fails.

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Protection performance of double-layered metal shields against projectile impact

Cited by 80 publications

References 24 publications

Ballistic performance of multi-layered metallic plates impacted by a 7.62-mm APM2 projectile

Ballistic performance of multi-layered metallic plates impacted by a 7.62-mm APM2 projectile

Elastomer-metal laminate armor

Effect of Soft-hard Plate and Rubber Sandwich Against on 5.56 mm Deformable Projectile

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