Application of sintered liners for explosively formed projectile charges

Borkowski, J.; Wilk, Z.; Koślik, Piotr; Szymańczyk, L.; Zygmunt, Bogdan

doi:10.1016/j.ijimpeng.2018.04.009

Cited by 33 publications

(13 citation statements)

References 7 publications

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“…Under impact at a high strain rate, the entire dynamic response becomes an adiabatic process, leading to adiabatic temperature increase. Formula (15) shows how the adiabatic temperature increase varies with stress-strain during the process of dynamic deformation.…”

Section: Temperature Modified Flow Stressmentioning

confidence: 99%

“…In recent years, many scholars have carried out extensive research on liner materials [11][12][13]; Li Ding [14] studied the performance of EFP formed by W alloys, Ni, U, and U alloy as high-density liner materials; in contrast, Ni materials liners have the best performance of EFP. Jacek Borkowski [15], Nengquan Duan [16] studied the penetration performance of penetrators formed by sintered copper liners and proved that liners made by powder metallurgy technology were a fully featured substitute for conventional spherical liners. Guo Wenqi [17] and Elshenawy T [18] studied the penetration ability of a shaped charge jet formed by a W-Cu liner, and the relative density of the damage element and target had a significant effect.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of the Dynamic Deformation of Pure Molybdenum at High Strain Rates and High Temperatures

Chen

Wang

et al. 2021

Materials

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To study the dynamic plastic properties of high-purity molybdenum materials at high temperature and high strain rate, we designed tests to compare the mechanical behaviour of two high-purity molybdenum materials with different purities and two with different processing deformation conditions under dynamic impact compression in the temperature range of 297–1273 K. We analysed the molybdenum materials’ sensitivities to the strain-hardening effect, strain rate-strengthening effect, and temperature-softening effect as well as the comprehensive response to the combined effect of the strain rate and temperature, the adiabatic impact process, and the microstructure at high temperature and high strain rate. Furthermore, based on a modified Johnson–Cook constitutive model, we quantitatively analysed the flow stresses in these materials. The calculation results strongly agree with the test results. Our findings indicate that the high-purity molybdenum materials show consistent sensitivity to the combined effect of strain rate and temperature regarding the dynamic plastic properties. The materials with higher purity are less sensitive to the combined effect of the strain rate and temperature, and those with less processing deformation experience more pronounced strain-hardening effects. Under high strain rate at room temperature, these materials are highly susceptible to impact embrittlement and decreases in dynamic plastic properties due to intergranular fracture in the internal microstructure. However, increasing the impact environment temperature can significantly improve their plastic properties. The higher the temperature, the better the plastic properties and the higher the impact toughness.

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Section: Temperature Modified Flow Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Dynamic Deformation of Pure Molybdenum at High Strain Rates and High Temperatures

Chen

Wang

et al. 2021

Materials

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“…Although the damage performance of low-density materials has previously been investigated [3,4], little importance has been placed on the compressive properties of the material prior to experiments. However, different manufacturing methods can significantly affect the compressive properties of Cu-PTFE, and this is known to influence the deformation and fracture behaviours and affect the performance of shaped charges [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…e effects of particle size, composition, and processing technology on the mechanical properties of composites have long been studied, while the effects of manufacturing methods are not well understood. Borkowski [5] conducted experimental investigations on the formation and penetration efficiency of EFP charges with liners using a powder metallurgy method. He found that powder metallurgy is useful for the production of liners for EFP charges.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Fabrication Technique on Compressive Properties of Cu‐PTFE Composites

Tang

Wang

Yin

et al. 2021

Advances in Materials Science and Engineering

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In this paper, the effect of manufacturing methods on the compressive properties of Cu-PTFE (polytetrafluoroethylene) composites was investigated. Two types of specimens were prepared through different manufacturing methods (extrusion forming and hot-press sintering). The specimens were tested using an electrohydraulic press and split-Hopkinson pressure bars for quasi-static loading and dynamic impact, respectively. The specific fracture processes were recorded by using a high-speed camera, and the failure microstructures of the specimens were analysed by SEM. According to the results, hot-press sintered specimens have consistently higher strength and toughness under dynamic compression than the extruded specimens, while the mechanical properties of hot-press sintered specimens are inferior to those of extruded specimens under quasi-static compression. The failure of extruded specimens is primarily caused by the elastic mismatch between the PTFE matrix and Cu particles, as well as the polymerisation of plastic pores, which leads to particle pullout. However, the cracks in the hot-press sintered specimens were caused by the shear deformation and interface sliding of the PTFE matrix, which led to matrix tearing.

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“…The perforation depth of the cone shaped liner is large, but the diameter of the broken hole is small, and the spherical shaped liner is opposite. The shaped-charge liners in new high-density alloys or elemental metals have a high armor penetration depth, but the aftereffect is insufficient; the PTFE energetic shaped-charge liner has a large aftereffect but is sensitive to standoff distance (1-2 times the charge diameter), and it is difficult to penetrate thick steel targets (> 1.5 times the charge diameter) [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. At present, a kind of line and charge structure is needed, which gives consideration to penetration depth and aftereffect.…”

Section: Introductionmentioning

confidence: 99%

Design and penetration of a new W-particle/Zr-based amorphous alloy composite liner

Han

Chen

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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In this paper, in order to boost the power of shaped charge, a new type of W-particle/Zr-based amorphous alloy composite liner embedded with a restraining cylinder is designed, which is different from the original shaped charge structure. The inner restraining cylinder divides the charge into two coaxial columns: inner and outer, which changes the flow mode of the material in the liner and improves the utilization rate of explosive charge. For the first time, W-particle/Zr-based amorphous alloy (W/Zr amorphous) was used to replace the traditional copper, enhancing the penetration depth and increasing the aftereffect. Theoretical analysis and numerical simulation show that the new type of liner is feasible with great advantages. The static explosion test shows that the penetration depth of W/Zr amorphous liner is 66.35% higher than that of the copper liner, and the overpressure behind the target is 0.24 MPa. Moreover, the jet is more stable without pestle. This is a new type of composite liner with wide application prospect.

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Application of sintered liners for explosively formed projectile charges

Cited by 33 publications

References 7 publications

Comparative Study of the Dynamic Deformation of Pure Molybdenum at High Strain Rates and High Temperatures

Comparative Study of the Dynamic Deformation of Pure Molybdenum at High Strain Rates and High Temperatures

Effect of the Fabrication Technique on Compressive Properties of Cu‐PTFE Composites

Design and penetration of a new W-particle/Zr-based amorphous alloy composite liner

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