Research on Feasibility of Several High Density Materials for EFP Liner and Material Selection Criteria

Ding, Li; Jiang, Jianliang; Men, Jianbing; Wang, Shuyou; Mei, Li

doi:10.1002/prep.201600141

Cited by 13 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Materials 2021, 14, x FOR PEER REVIEW 17 of 20 14 shows that while the fitting results of the MJC constitutive model are consistent with the test results at high temperature and high strain rate, the relationship between the flow stress and the plastic strain of molybdenum materials under impact load at room temperature fitted by the MJC constitutive model is different from the test data. By observing microstructures of molybdenum materials after impact at room temperature and high temperature, as shown in Figures 3-5, we find that molybdenum materials are prone to producing a large number of structural defects such as cracks at room temperature and high strain rate, although this phenomenon is not evident at high temperature.…”

Section: Impact Embrittlement and Tougheningmentioning

confidence: 55%

“…We comparatively study the sensitivities of Mo-L, Mo-H, and Mo-C to the combined effect of strain rate and temperature under impact load and use the combined parameter T * t of the equivalent strain rate * and temperature T, as shown in Formula (13). For the assessment model of the relationship between flow stress σ and combined parameter T * t , see Formula (14).…”

Section: Rate-temperature Equivalencementioning

confidence: 99%

See 1 more Smart Citation

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

Chen

Wang

et al. 2021

Materials

View full text Add to dashboard Cite

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.

show abstract

Section: Impact Embrittlement and Tougheningmentioning

confidence: 55%

Section: Rate-temperature Equivalencementioning

confidence: 99%

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

Chen

Wang

et al. 2021

Materials

View full text Add to dashboard Cite

show abstract

“…The W-25Re liner broke into parts of fragments at 250 µs. For the 90W-9Ni-Co and W-25Re liners, both vertical and horizontal fractures could be observed in the X-ray picture [19].…”

Section: Resultsmentioning

confidence: 95%

“…(ii) Impact toughness α k can be an alternative guideline, which should be in the range of 1500-2000 KJm −2 . (iii) Fracture surface appearance of microvoid coalescence both in the quasi-static and dynamic failure is preferred [19]. (iv) r(θ) of the crack-tip plastic zone can also be an alternative guideline to explain the fracture phenomenon in explosive loading.…”

Section: Analysis Of Fracture Mechanismmentioning

confidence: 99%

Dynamic Response and Numerical Interpretation of Three Kinds of Metals for EFP Liner under Explosive Loading

Ding

Shen

2022

Crystals

Self Cite

View full text Add to dashboard Cite

In order to study the dynamic response of tungsten heavy alloy materials under explosive loading, two kinds of typical tungsten alloys for explosively formed projectile (EFP) liner and one kind of existing EFP liner were tested in a flash X-ray experiment, with copper liner as a reference. Results showed that copper liner could form a coherent EFP, while 90W–9Ni–Co and W–25Re liners fractured to different extents. The microscopic features of the three kinds of metals were examined and compared with the original liner, and the microstructure evolutions under explosive loading were analyzed with the fracture model and mechanism of the two kinds of tungsten alloys’ fracture determined. Associated with the stress and strain conditions by numerical simulation, the fracture mechanism of tungsten heavy alloys can be analyzed. The crack-tip plastic zones of 90W–9Ni–Co and W–25Re are much smaller than copper, and due to the severe stress concentration at the tip of cracks, it is easy for cracks to propagate and trigger the cleavage in tungsten alloys. The value of a crack-tip plastic zone r(θ) can be used to explain the fracture phenomenon in explosive loading, which can be an alternative guideline for the material selection criteria of the EFP liner. The research results are significant in understanding the dynamic forming, microstructure evolution, and fracture mechanism of tungsten heavy alloys.

show abstract

“…The shapes of EFPs can be quasi-spherical, long rodshaped, and other shapes. Tantalum is also a potential EFP material except copper, the traditional material used for EFPs [17,18]. At present, studies on the effect of these EFP characteristic parameters on penetration ability while passing through the ERA are still lacking.…”

Section: Introductionmentioning

confidence: 99%

Penetration Capability of EFPs Against Explosive Reactive Armor

Nie

Jiang

Wang

et al. 2019

Propellants Explo Pyrotec

View full text Add to dashboard Cite

This study aimed to investigate the interference of explosive reactive armor (ERA) on the penetration capability of explosively formed projectiles (EFPs). A numerical simulation model of EFP and the ERA interaction system was established. Flash X‐ray experiments for observing the interaction between EFP and ERA were performed. It turned out that the simulation method and material model was valid. From the numerical simulation, the residual depth of penetration (RDOP) of EFPs with different materials, scales, and shapes at several angles was evaluated, and the mechanism of ERA interference EFP was revealed. The results suggested that after an EFP passed through an ERA, its RDOP to target decreased with an increase in the angle and explosive layer thickness. The higher the density of EFP is, the stronger the resistance ability of EFP to ERA is. For copper EFPs, in the EFP charge diameter range of 90 mm to 170 mm, each 10‐mm growth in the EFP charge diameter results in an approximately 0.025 P0 increment in RDOP (P0 is penetration depth of EFP without ERA interference). Moreover, in the condition of the same mass, for each increase of 1 in the aspect ratio of the EFP, the RDOP increased by approximately 0.05 P0. In addition, calculation models for the RDOP, considering the charge diameter and EFP shape, were established respectively.

show abstract

Research on Feasibility of Several High Density Materials for EFP Liner and Material Selection Criteria

Cited by 13 publications

References 15 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

Dynamic Response and Numerical Interpretation of Three Kinds of Metals for EFP Liner under Explosive Loading

Penetration Capability of EFPs Against Explosive Reactive Armor

Contact Info

Product

Resources

About