Influence of fragmentation on the capacity of aluminum alloy plates subjected to ballistic impact

Holmen, Jens Kristian; Johnsen, Joakim; Hopperstad, Odd Sture; Børvik, Tore

doi:10.1016/j.euromechsol.2015.09.009

Cited by 50 publications

(17 citation statements)

References 29 publications

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“…Note that CCE analyses assume ductile hole growth and cannot describe fragmentation; thus, the correct physical mechanism is not captured in the analysis for AA6070-T6 and T7. The causes and effects of target fragmentation are discussed in Holmen et al (2013Holmen et al ( , 2016.…”

Section: Methodsmentioning

confidence: 99%

Cylindrical cavity expansion approximations using different constitutive models for the target material

Johnsen

Holmen

Warren³

2017

International Journal of Protective Structures

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In this article, we investigate the results obtained using different constitutive models for the solution of the cylindrical cavity expansion problem under plane strain conditions. The cylindrical cavity expansion solutions are employed with the cylindrical cavity expansion approximation to obtain ballistic limit and residual velocities for ductile metals perforated by rigid projectiles. Many of the previously developed cylindrical cavity expansion approximations use simplified constitutive models. However, in the present work, we first extend the cylindrical cavity expansion theory with the Voce strain hardening rule, before we utilize three different strain hardening constitutive models in cylindrical cavity expansion calculations to predict ballistic limit and residual velocities of aluminum and steel target plates struck by rigid projectiles. The results show that when strain hardening is accurately represented by the constitutive models until necking in a uniaxial tension test, all cylindrical cavity expansion models predict ballistic limit velocities that are close to the experimental data.

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Section: Methodsmentioning

confidence: 99%

Cylindrical cavity expansion approximations using different constitutive models for the target material

Johnsen

Holmen

Warren³

2017

International Journal of Protective Structures

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“…The finite element method with Lagrangian approach is the traditional choice for developing a numerical model of high-velocity impact on metal shields. The numerical model is usually three-dimensional [ 5 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ] but also an axisymmetric model [ 1 , 4 , 24 ] has been used in the literature. The former is able to simulate more realistically the physical characteristics of the phenomenon but requires far more computational resources.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Perforation Resistance of Double-Layered Metal Shield under High-Velocity Impact of Armor-Piercing Projectiles

2021

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In the case of protection of transportation systems, the optimization of the shield is of practical interest to reduce the weight of such components and thus increase the payload or reduce the fuel consumption. As far as metal shields are concerned, some investigations based on numerical simulations showed that a multi-layered configuration made of layers of different metals could be a promising solution to reduce the weight of the shield. However, only a few experimental studies on this subject are available. The aim of this study is therefore to discuss whether or not a monolithic shield can be substituted by a double-layered configuration manufactured from two different metals and if such a configuration can guarantee the same perforation resistance at a lower weight. In order to answer this question, the performance of a ballistic shield constituted of a layer of high-strength steel and a layer of an aluminum alloy impacted by an armor piercing projectile was investigated in experimental tests. Furthermore, an axisymmetric finite element model was developed. The effect of the strain rate hardening parameter C and the thermal softening parameter m of the Johnson–Cook constitutive model was investigated. The numerical model was used to understand the perforation process and the energy dissipation mechanism inside the target. It was found that if the high-strength steel plate is used as a front layer, the specific ballistic energy increases by 54% with respect to the monolithic high-strength steel plate. On the other hand, the specific ballistic energy decreases if the aluminum plate is used as the front layer.

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“…As one of the most complicated struggles in solid mechanics, high-velocity impact has been-and will remain-a major topic of interest among many researchers specially in aerospace field [1][2][3][4][5][6][7]. In this respect, researchers have to fully comprehend and aptly analyze the process of projectile penetration in designing structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical assessment of impact resistance of FMLs including one rubber layer

Arzani

Ataabadi

Chaparian

2020

J Braz. Soc. Mech. Sci. Eng.

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Fiber metal laminates have lately attracted considerable interest due to their diverse use in industrial sectors. Indeed, FMLs are virtually applied by combining both the metal and composite layers in order to achieve better outcomes. The preference of FML over metal or composite has been verified in many studies. The preliminary objective of the present study, however, is to make attempts to evaluate the influence of rubber layer on FML impact resistance once subjected to high-velocity impact. To this end, a numerical analysis is administered following an experiment. In this regard, the applied materials consist of 2024-T3 aluminum alloy, woven glass/epoxy prepreg and nitrile butadiene rubber. The steel projectile for impact tests was geometrically cylinder and flat-ended. It is noteworthy that all tests were run by a high-speed gas gun, and the numerical analysis was carried out in LS-DYNA software. Ultimately, the obtained results indicated that by inserting a rubber layer among the laminates, aluminum layer can bend further, and more kinetic energy can be dissipated from the projectile. Moreover, the special perforation energy and ballistic limit velocity, V 50 , increased dramatically.

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Influence of fragmentation on the capacity of aluminum alloy plates subjected to ballistic impact

Cited by 50 publications

References 29 publications

Cylindrical cavity expansion approximations using different constitutive models for the target material

Cylindrical cavity expansion approximations using different constitutive models for the target material

Experimental and Numerical Investigation on the Perforation Resistance of Double-Layered Metal Shield under High-Velocity Impact of Armor-Piercing Projectiles

Experimental and numerical assessment of impact resistance of FMLs including one rubber layer

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