Investigation about the influence of the mechanical properties of lead core and brass jacket of a NATO 7.62 mm ball bullet in numerical simulations of ballistic impacts

Giglio, Marco; Gilioli, Andrea; Manes, Andrea; Peroni, Lorenzo; Scapin, Martina

doi:10.1051/epjconf/20122604010

Cited by 13 publications

(7 citation statements)

References 8 publications

(18 reference statements)

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“…Lead alloy, brass (CuZn30), red brass (CuZn10) and copper adopt the Johnson-Cook constitutive model; copper and brass (CuZn30) adopt the J-C failure model, while lead and red brass (CuZn10) adopt a constant strain failure value, in accordance with experimental tests performed in [19,20] on these materials. The ultimate strain of red brass is equal to 40% and for lead equal to 31%.…”

Section: Projectile Features and Mechanical Propertiessupporting

confidence: 52%

“…The equation of state of the deformable materials is the MieGruneisen. The parameters of the J-C constitutive and failure law [10,19,23] and of the Mie-Gruneisen equation of state [21,22,24,25] are reported in Table 3 and 4. …”

Section: Projectile Features and Mechanical Propertiesmentioning

confidence: 99%

“…The fabric is impregnated in Epoxy matrix, to guarantee both structural and ballistic resistance, and is a 2D plain-weave, with no yarns woven among the layers, but with yarns woven alternatively among them, within every layer. The choice of evaluating the ballistic performance of the composite plate only by means of the numerical approach is justified by the broad exploitation of the numerical methodology in other impact models by the authors [1,9,10,19], with excellent agreement with the experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Ballistic Performance of Multi-layered Fabric Composite Plates Impacted by Different 7.62mm Calibre Projectiles

Manes

Bresciani

Giglio

2014

Procedia Engineering

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At present, the use of refined numerical simulation is gaining more and more importance, especially in extreme load cases where large experimental test programmes are not feasible. A validated numerical methodology can be exploited to investigate critical behaviour as a "virtual test". According to this premise, a numerical investigation is presented in this work to study the ballistic resistance of Kevlar29-Epoxy fabric plates subjected to impacts of small calibre projectiles, armour piercing (AP), ball type, and a blunt shaped projectile (BSP), all with a 7.62 mm diameter. The numerical models were developed using the explicit finite element code LS -DYNA. The composite plate is 5 mm thick, made up of 12 layers. The fabric is impregnated in Epoxy matrix, to guarantee both structural and ballistic resistance, and is a 2D plain-weave. The mechanical properties of the projectiles' deformable materials were modelled by means of the Johnson-Cook plasticity model, which also includes the failure criterion. The composite plate is modelled using a mixed Macro-homogenous / Meso-heterogeneous approach. In particular, the area around the impact adopts the Meso-heterogeneous modelling, in which the woven yarns and the matrix are separate parts able to interact, to increase the efficiency of the numerical methodology, allowing the modelling of the friction between the yarns, the delamination and the fibre-matrix debonding. This method needs to assign separately the mechanical properties to the fabric and the matrix as well as the damage criteria for the yarns, the matrix and the delamination. In the Macro-homogenous approach, which models the remainder of the composite plate, the yarns and the matrix are considered as a unique homogenous mean, to which equivalent orthotropic mechanical properties of the impregnated fabric are assigned. The numerical investigation mainly focuses on the residual velocity of the impacting projectiles, identifying the ballistic limit of each couple projectile-target.

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Section: Projectile Features and Mechanical Propertiessupporting

confidence: 52%

Section: Projectile Features and Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ballistic Performance of Multi-layered Fabric Composite Plates Impacted by Different 7.62mm Calibre Projectiles

Manes

Bresciani

Giglio

2014

Procedia Engineering

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“…The whole surface of the penetration channel is contaminated with lead from the projectile ( Figure 12 b). When the bullet hits the target the thin jacket is quickly eroded (thus difference in jacket calibration are almost negligible) and the soft core is able to damage the stainless steel target [ 80 ]. The high temperature generated by friction between the projectile and the target causes the lead material to heat up.…”

Section: Resultsmentioning

confidence: 99%

Three-Dimensional Smooth Particle Hydrodynamics Modeling and Experimental Analysis of the Ballistic Performance of Steel-Based FML Targets

et al. 2022

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In this paper, shields made of 1.3964 stainless steel bonded to a fiber laminate were subjected to ballistic impact response of 7.62 × 51 mm ŁPS (light projectile with a lead core) projectiles. Additionally, between the steel sheet metal and the laminate, a liquid-filled bag was placed, which was a mixture of ethylene glycol (C2H6O2) with 5 wt.% SiO2 nanopowder. Numerical modeling of the projectile penetrating the samples was carried out using the finite element method in the Abaqus program. The elasto-plastic behavior of the projectile material and the component layers of the shields was taken into account. Projectile penetration through glycol-filled bag has been performed using the smooth particle hydrodynamics technique. The morphology of the penetration channel was also analyzed using a scanning electron microscope. For the shield variant with a glycol-filled bag between the steel and laminate plates, the inlet speed of projectile was 834 m/s on average, and 366 m/s behind the sample. For the variant where there was no glycol-filled bag between the steel and laminate plates, the inlet and outlet average velocities were 836 m/s, after 481 m/s, respectively. Referring to the steel-glycol-laminate and steel-laminate variants, it can be concluded that the laminate-glycol-laminate is more effective.

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“…The failure of the brass jacket was determined based on a critical fracture strain " f ¼ 0:4. 22 Material parameters of a similar steel Armox 500T, 3,17 based on the hardness and ultimate tensile Initial velocity applied to the core and the jacket Figure 5. Initial configuration for the projectile and the base armour plate with boundary conditions.…”

Section: Finite Element Modellingmentioning

confidence: 99%

Ballistic response of 12.7 mm armour piercing projectile against perforated armour developed from structural steel

Mubashar

Uddin

Anwar

et al. 2018

Proceedings of the IMechE

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This study investigates ballistic response of a developed perforated armour plate against 12.7 mm armour piercing tracer projectile. Experimental as well as numerical studies were carried out and the penetration of the projectile through a base aluminium plate was determined with and without the perforated armour plate. The armour piercing projectiles were able to penetrate the base armour plate in successive impacts. However, the combination of the perforated and base armour plates was able to stop the penetration of the armour piercing projectile. A finite element method-based numerical model was developed to investigate the defeating phenomenon of perforated and base armour plate combination. It was observed that the asymmetric impact of the projectile core did not produce large enough bending to fracture the core. However, the high hardness of the developed perforated plate was able to shatter the projectile core in multiple fragments which were then unable to penetrate the base armour plate. Craters of varying depths were observed on the impact side of the base armour plate. The research showed that the selected structural steel can be successfully used for ballistic protection.

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Investigation about the influence of the mechanical properties of lead core and brass jacket of a NATO 7.62 mm ball bullet in numerical simulations of ballistic impacts

Cited by 13 publications

References 8 publications

Ballistic Performance of Multi-layered Fabric Composite Plates Impacted by Different 7.62mm Calibre Projectiles

Ballistic Performance of Multi-layered Fabric Composite Plates Impacted by Different 7.62mm Calibre Projectiles

Three-Dimensional Smooth Particle Hydrodynamics Modeling and Experimental Analysis of the Ballistic Performance of Steel-Based FML Targets

Ballistic response of 12.7 mm armour piercing projectile against perforated armour developed from structural steel

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