Dynamic fracture of tungsten heavy alloys

Bless, Stephan; Tarcza, Kenneth R.; Chau, R.; Taleff, Eric M.; Persad, C.

doi:10.1016/j.ijimpeng.2006.09.028

Cited by 27 publications

(9 citation statements)

References 7 publications

(10 reference statements)

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“…The unloading rates are normally interpreted as indicators of the kinetics of the tensile pulse imposed on the target [6][7] . As such, these values indicate that the sample subjected to profile S experienced a faster tensile stress rate as compared with the sample subjected to profile L. The corrected spall strength values calculated using Equations 1-3 are listed in Table II, they differ by only ~14 %, being slightly higher in profile S as compared to the profile L. These spall strength values are consistent with those reported in the literature 30,32,34 . It is worth noting that the difference between the two specimens is less than the sample-to-sample scatter generally reported for WHA and is consistent with the statistical variation within a given sample reported by Vogler and Clayton 34 , therefore being statistically insignificant for this brittle material.…”

Section: A Free Surface Velocity Profilessupporting

confidence: 87%

“…While the composite is known to fail in a brittle manner, it displays improved ductility under compression and tension in comparison to that of pure polycrystalline tungsten 18 . The shock response has been reported in the literature for pure polycrystalline tungsten [18][19][20][21][22][23][24][25][26] and tungsten heavy alloys [27][28][29][30][31][32][33][34][35][36] under different loading environments. For instance, in plate impact experiments using monolithic impactors, Zurek and Gray 18 reported spall strengths of WHA to be 3.4-3.8 GPa.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, in plate impact experiments using monolithic impactors, Zurek and Gray 18 reported spall strengths of WHA to be 3.4-3.8 GPa. Dandekar and Weisgerber 30 reported the spall strength of WHA to be 1.7-2.0 GPa, whereas Bless and Chau 32,33 reported the spall strength for WHA to be 2.6 GPa. Vogler and Clayton 34 employed line-VISAR to spatially resolve statistics on the spall strength of WHA.…”

Section: Introductionmentioning

confidence: 99%

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The effect of shock-wave profile on dynamic brittle failure

Escobedo

Brown

Trujillo

et al. 2013

Journal of Applied Physics

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The influence of shock-wave-loading profile on the failure processes in a brittle material has been investigated. Tungsten heavy alloy (WHA) specimens have been subjected to two shock-wave loading profiles with a similar peak stress of 15.4 GPa but different pulse durations. Contrary to the strong dependence of strength on wave profile observed in ductile metals, for WHA, specimens subjected to different loading profiles exhibited similar spall strength and damage evolution morphology. Post-mortem examination of recovered samples revealed that dynamic failure for both loading profiles is dominated by brittle cleavage fracture, with additional energy dissipation through crack branching in the more brittle tungsten particles. Overall, in this brittle material all relevant damage kinetics and the spall strength are shown to be dominated by the shock peak stress, independent of pulse duration

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Section: A Free Surface Velocity Profilessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of shock-wave profile on dynamic brittle failure

Escobedo

Brown

Trujillo

et al. 2013

Journal of Applied Physics

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“…The advantage of two phase matrix is substantially enhanced strength. While the alloys have found use in state of the art KE penetrators, the studies on the mechanical behaviour of these alloys are relatively scarce (Kocic et al, 2016;Bless et al, 2006). The study is also of fundamental interest given that the microstructure specifically the matrix phase is substantially different from that observed in the earlier generation alloys (W-Ni-Fe, W-Ni-Fe-Co, W-Ni-Fe-Co-Mo etc.…”

Section: Introductionmentioning

confidence: 99%

The effect of fine W particles in matrix phase on mechanical properties of tungsten heavy alloys

Kumari

Sarkar

Panchal

et al. 2022

JART

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Tungsten heavy alloys 90W-7Ni-3Co (WNC) and 89.6W-6.2Ni-1.8Fe-2.4Co (WNFC), produced using liquid phase sintering followed by thermo-mechanical processing, were investigated for microstructure and mechanical properties. 90W-7Ni-3Co alloy processed following a cyclic heat treatment showed fine tungsten particles in the matrix. The alloy, when heat treated at a temperature 850°C (the lower temperature of cyclic treatment), formed a W-rich intermetallic phase in the matrix that subsequently dissolved during high temperature (1150°C) solution treatment leaving behind fine W particles. On the other hand, the matrix phase of the alloy, 89.6W-6.2Ni-1.8Fe-2.4Co showed a clean structure devoid of any such precipitates. Both the alloys were subjected to a thermomechanical treatment that included two stage swaging with intermediate heat treatments. 90W-7Ni-3Co alloy exhibited superior strength, but lower elongation to failure and impact toughness as compared to 89.6W-6.2Ni-1.8Fe-2.4Co alloy. Microstructure-property correlation was undertaken in order to elucidate the effect of enhanced W dissolution and fine W precipitates (in the matrix) on mechanical behaviour of the alloys investigated.

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“…Moreover, several other authors have reported that the cracks initiated at the tungsten-tungsten grain boundaries. By conducting spall and transverse impact experiments, Bless et al [6] proposed that at the mesoscopic scale, the grain cleavage was mainly responsible for the transverse fracture and the grain fracture, which plays a critical role in the initiation of spall fracture. Pink et al [7] investigated the variation of tensile properties of a 92.5%W heavy alloy as a function of temperature and found that the deformation behavior below 400°C was similar to other body-centered cubic metals but with some deviations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Tungsten-nickel-iron Composites under Impact Loadings

Liu¹,

Song²,

Ren³

2009

International Journal of Nonlinear Sciences and Numerical Simulation

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Plate impact experiments under the high strain rates are conducted to study the dynamic behavior of 91W-6.3Ni-2.7Fe alloys. The Lagrangian analysis is adopted to analyze the mechanical properties of the tungsten alloys and determine their stress-strain curves. The influence of grain size on the dynamic behavior of tungsten alloys is studied and the stress-strain curves are measured in a strain rate range of 1,000 ~ 10,0007 s . Based on the experimental observation, an explicit finite element program is suggested to analyze fracture modes of projectile and tungsten alloy target, respectively. A dozen cases are studied numerically to investigate the dynamic mechanical behavior of tungsten alloy target. The fracture modes of the targets at a specific time are obtained. A good agreement between numerical predictions and experimental results suggests that the finite element analysis is effective and useful for analysis of the mechanical properties of tungsten alloys.

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Dynamic fracture of tungsten heavy alloys

Cited by 27 publications

References 7 publications

The effect of shock-wave profile on dynamic brittle failure

The effect of shock-wave profile on dynamic brittle failure

The effect of fine W particles in matrix phase on mechanical properties of tungsten heavy alloys

Dynamic Response of Tungsten-nickel-iron Composites under Impact Loadings

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