A study of the perforation of aluminium laminate targets

Woodward, R. L.; Cimpoeru, Stephen J.

doi:10.1016/s0734-743x(97)00034-1

Cited by 85 publications

(38 citation statements)

References 20 publications

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“…This steady state penetration phase in which penetration velocity is approximately constant with time becomes more dominant if the impacting body is long (a Taylor bar that is L/D > 5. Here, L is length and D diameter) [17].…”

Section: Phases Of Penetrationmentioning

confidence: 99%

Characterization of the ballistic limit curve for hypervelocity impact of sphere onto single plate

Lee

Cho

2011

J Mech Sci Technol

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A ballistic limit curve for hypervelocity impact of spherical aluminum projectiles on a single wall aluminum plate is examined using the smooth particle hydrodynamics (SPH) method. A brief description is provided about a new in-house code with an emphasis on the axi-symmetric coordinate scheme. The Benchmark Taylor bar impact test was first demonstrated as a validation of the code. Then a series of hypervelocity impact simulations was performed in axi-symmetric coordinate. The impact velocity ranged from 2 km/s to 10 km/s. The plate thickness varied from 2 mm to 8 mm. The ballistic limit results calculated are compared with predictions from empirical correlations, and the results are shown to fall within the envelope of the empirical correlation. A simple theory is developed to analyze the characteristics of ballistic limit curves. The theory provides a good insight on the hypervelocity plate impact event and is valuable for design concerns.

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Section: Phases Of Penetrationmentioning

confidence: 99%

Characterization of the ballistic limit curve for hypervelocity impact of sphere onto single plate

Lee

Cho

2011

J Mech Sci Technol

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“…Work conducted by Woodward and Cimpoeru [9] on the high-velocity perforation processes in monolithic and layered aluminum plates revealed that the ballistic limit of plates struck by conical-shaped projectiles is higher than that of plates struck by flat-ended projectiles. This was found to be independent of the target configuration.…”

Section: Introductionmentioning

confidence: 99%

Low-velocity impact on multi-layered dual-phase steel plates

Holmen

Hopperstad

Børvik

2015

International Journal of Impact Engineering

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In this paper an experimental program investigating the behavior of monolithic and multi-layered configurations of 0.8 mm and 1.8 mm medium-strength steel plates is presented. We have considered impacts by blunt-ended and ogival-ended impactors in the low-velocity regime (≤ 16 m/s). Experimental outputs include measurements of force and velocity, and deformation fields. Force and velocity readings were provided by a strain-gauge instrumented striker, while digital image correlation was used to obtain the displacement field from the rear side of the bottom plate. For the 0.8 mm plates a near linear relationship between the number of layers and the ballistic limit velocity was found. The plates' resistance against perforation was found to be higher for the blunt-ended impactor than for the ogival-ended impactor. This can be explained by the failure mechanisms. The monolithic plates have a higher capacity than layered plates with the same total thickness: this is particularly clear for plates struck by the ogival-ended impactor. The experiments provide ample data to validate the subsequent 3D numerical simulations. The analysis model is double-symmetric in simulations using the ogival-ended impactor, while only a 10 • slice of the plate and impactor is needed in simulations using the blunt-ended impactor. A thermoelastic-thermoviscoplastic constitutive relation combined with the Cockcroft-Latham criterion for failure is implemented in IMPETUS Afea Solver, and used in all simulations. The simulations predict the failure modes fairly well, and the numerical results are within the range seen in previous publications. Sensitivity studies regarding friction, mesh refinement, thermal formulation and strain-rate dependence are conducted and discussed.

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“…The effect of air gaps upon ballistic properties of the shield was further discussed in [6], where the authors concluded that for the non-conical shape of the projectile changes in the ballistic limit velocity were in the range of several per cent. Woodward and Cimpoeru [7] investigated perforation of laminated and homogeneous plate targets by flat-ended and conical penetrators. The comparison of calculated and experimental ballistic limit showed that superior resistance occurred for the target system with two plates.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on ballistic resistance of aluminium multi-layered panels impacted by improvised projectiles

2017

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This paper presents a numerical study of perforation of the aluminium multi-layered targets impacted by steel projectiles in the shape of a ball, nut and nail. For the construction of the protective panels arc-, rectangular-, V-and U-shaped sheets of metal were considered. During the tests the panel thickness was constant at 160 mm. The panels were composed of 1.5-mm-thick aluminium sheets, and the initial speed of debris was 500 m/s. A comprehensive numerical study indicated the shape of the layer that had superior ballistic resistance and the best strength-to-weight ratio. Computational analyses were also used to investigate the influence of thermal softening and strain rate hardening in the Johnson-Cook constitutive model on the ballistic performance of layered targets. The number of layers required to stop the penetrating objects was compared for the rigid and deformable projectiles. Based on the comparative studies, some guidelines for engineering tasks involving exploration of number of possible technical solutions were proposed.

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A study of the perforation of aluminium laminate targets

Cited by 85 publications

References 20 publications

Characterization of the ballistic limit curve for hypervelocity impact of sphere onto single plate

Characterization of the ballistic limit curve for hypervelocity impact of sphere onto single plate

Low-velocity impact on multi-layered dual-phase steel plates

Numerical investigation on ballistic resistance of aluminium multi-layered panels impacted by improvised projectiles

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