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Rittel, D.; Weisbrod, Gil

doi:10.1023/a:1013581609836

Cited by 33 publications

(12 citation statements)

References 14 publications

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“…As will be shown in the sequel, the validation of the overall approach, as shown in previous works [16,17,18] lies in the requirement that the equivalent stress-strain curve obtained using the SCS be similar to that obtained either through tension or compression tests, although the latter are limited in the range of strains attainable.…”

Section: Resultsmentioning

confidence: 89%

“…The issue of adiabatic shear band formation has not been related to material orientation, even if the ballistic efficiency of the material depends on its tendency to fail by this mechanism. Weisbrod and Rittel [15,16] did study the anisotropy of the quasi-static and dynamic fracture properties of a tungsten-based heavy alloy and reported a significant anisotropy of the fracture toughness (quasi-static and dynamic). However, no extensive study has been performed on the relationship between material orientation and adiabatic shear band formation.…”

Section: Introductionmentioning

confidence: 99%

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On the isotropy of the dynamic mechanical and failure properties of swaged tungsten heavy alloys

Rittel

Levin

Dorogoy

2004

Metall Mater Trans A

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The quasi-static and dynamic mechanical and failure properties of a swaged tungsten-base heavy alloy rod have been investigated, with emphasis on the orientation of the specimens in the rod. Three orientations were considered, 0, 45, and 90 deg, with respect to the longitudinal axis of the rod. Compression, tension, and dominant shear tests were carried out. With the exception of the 0 deg orientation, all the orientations displayed quite similar mechanical characteristics in tension and compression. Dynamic shear revealed a critical strain for adiabatic shear failure of c Ϸ 0.13, independent of the orientation and quite inferior to the quasi-static ductility. The present study confirms previous results obtained for one (generally unspecified) orientation and extends them to three orientations. Failure mechanisms were thoroughly characterized and it appears that significant damage does not develop prior to final failure. It is concluded that, for practical purposes, the swaged heavy alloy considered here can be regarded as isotropic from a mechanical and failure point of view, in spite of its microstructural anisotropy resulting from the swaging process.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

On the isotropy of the dynamic mechanical and failure properties of swaged tungsten heavy alloys

Rittel

Levin

Dorogoy

2004

Metall Mater Trans A

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“…For example, Couque et al [7] find that the toughness of tungsten heavy alloys drops from 71 to 28 MPa m 1/2 as the stress intensity loading rate increases from 1 to 10 6 MPa m 1/2 /s. On the other hand, Rittel and Weisbrod [8] find that the toughness of similar tungsten heavy alloys increases with strain rate in some directions. More data for pure tungsten is needed before firm conclusions can be made.…”

Section: Fatigue and Fracture In Armormentioning

confidence: 98%

Thermomechanical effects in a laser IFE first wall

Blanchard

Martin

2005

Journal of Nuclear Materials

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“…As the additional elements are present only in relatively small quantities, the alloy bears properties similar to pure tungsten in certain aspects. However, due to the ductility of the matrix, the fracture toughness of WHAs at room temperature can be approximately one order of magnitude higher than that of pure W [1]. Moreover, the mechanical properties of WHAs can be further improved by thermomechanical treatment such as rotary forging [2].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Fatigue Properties of Tungsten Heavy Alloy Prepared by RF-Plasma

Kovářík

Čech

Klečka

et al. 2021

Thermal Spray 2021: Proceedings From the International Thermal Spray Conference

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Tungsten heavy alloy (WHA) of W-Ni composition was deposited from a blend of standard thermal spray powders using radio frequency inductively coupled plasma torch (RF-ICP) in a protective atmosphere. The deposit (RF WHA) contained a fully developed WHA structure; i.e.; spherical W particles embedded in a Ni-rich matrix. The bending tensile strength Rm; bending yield strength Rp;0.2; and elastic modulus of the deposit were compared with two W-Ni-Co references fabricated by powder metallurgy (PM WHA) via sintered and quenched (PMSQ); and forged and annealed (PM-FA). While the RF deposit properties are comparable with the PM-SQ reference; the PMFA exhibited higher mechanical properties. The deposit showed very limited ductility A < 3%. The fatigue crack growth rate in the deposit measured in bending (R < -1) was comparable to the PM-SQ reference material in the near-threshold region whereas the forged PM-FA had significantly better fatigue performance. In the near-threshold fatigue regime; the crack growth took place in the Ni-rich matrix. In the Paris regime; the similar fracture mode was observed; with the exception of PM-SQ; where the tungsten particles fracture contributed significantly. The static failure was exclusively trans-particle in RF WHA; while both PM WHAs failed by a mix of ductile matrix failure and trans-particle cleavage fracture. The fracture toughness of the deposit was significantly lower than the references. These early results indicate that RF-plasma spray is a suitable and efficient manufacturing method for production of WHA materials; however with limited mechanical properties in some aspects.

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Cited by 33 publications

References 14 publications

On the isotropy of the dynamic mechanical and failure properties of swaged tungsten heavy alloys

On the isotropy of the dynamic mechanical and failure properties of swaged tungsten heavy alloys

Thermomechanical effects in a laser IFE first wall

Mechanical and Fatigue Properties of Tungsten Heavy Alloy Prepared by RF-Plasma

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