Development of shear bands in dynamic plane strain compression of depleted uranium and tungsten blocks

Batra, R.C.; Peng, Zhanshuo

doi:10.1016/0734-743x(94)00049-3

Cited by 27 publications

(10 citation statements)

References 6 publications

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“…8, reveals that the tangential velocity, as conjectured by Tresca (1878), is discontinuous across the band. For plane strain compression of depleted uranium and WHA blocks, Batra and Peng (1995) also found the tangential velocity to be discontinuous across the band. Needleman (1989), Zhou and Batra (1991) and Batra and Rattazzi (1997) equated the speed of propagation of a shear band to that of a contour of eective plastic strain.…”

Section: Computation and Discussion Of Resultsmentioning

confidence: 99%

“…At each point and for both materials, the eective stress drops, the rate of drop of the eective stress is a little higher when the material is modeled as a homogeneous alloy than that for the mixture. Batra and Kim (1992) and Deltort (1994) have postulated that a shear band initiates at a point when the eective stress there drops to 90% and 80%, respectively, of its peak value. According to this de®nition, a shear band initiates at points P and R in the Fig.…”

Section: Computation and Discussion Of Resultsmentioning

confidence: 99%

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Adiabatic shear bands in the Taylor impact test for a WHA rod

Stevens

Batra

1998

International Journal of Plasticity

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Section: Computation and Discussion Of Resultsmentioning

confidence: 99%

Section: Computation and Discussion Of Resultsmentioning

confidence: 99%

Adiabatic shear bands in the Taylor impact test for a WHA rod

Stevens

Batra

1998

International Journal of Plasticity

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“…Fig. 9 shows the shear stress-shear strain curves obtained from torsional Kolsky bar tests for tungsten heavy alloys [23,24]. When the spe~cimen was solid-state sintered at 1300~ the shear stress dropped abruptly after reaching maximum shear stress and the shear strain at mechanically alloyed tungsten heavy, two-step sintered mechanically alloyed and blended tungsten heavy alloy, and conventional liquid phase sintered tungsten heavy alloy using blended powders obtained from the torsional Kolsky bar test at a strain rate of 1500/s.…”

Section: Methodsmentioning

confidence: 99%

Microstructural control of and mechanical properties of mechanically alloyed tungsten heavy alloys

Ryu

Hong

Lee

et al. 1999

Metals and Materials

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93W-5.6Ni-l.4Fe tungsten heavy alloys with controlled microstructures were fabricated by mechanically alloying of elemental powders of tungsten, nickel and iron by two different process routes. One was the full mechanical alloying of blended powders with a composition of 93W-5.6Ni-l.4Fe, and the other was the partial mechanical alloying of blended powders with a composition of 30W-56Ni-14Fe followed by blending with tungsten powders to form a final composition of 93W-5.6Ni-l.4Fe. The raw powders were consolidated by die compaction followed by solid state sintering at 1300~ for 1 hour in a hydrogen atmosphere. The solid state sintered tungsten heavy alloys were subsequently liquid phase sintered at 1445-1485~ for 4-90 min. The two-step sintered tungsten heavy alloy using mechanically alloyed 93W-5.6Ni-l.4Fe powders showed tungsten particles of about 6-15 ktm much finer than those of 40 Bm in a conventional liquid phase sintered tungsten heavy alloy. An inhomogeneous distribution of the solid solution matrix phase was obtained in the two-step sintered tungsten heavy alloy using partially mechanically alloyed powders. The two-step sintered tungsten heavy alloy using mechanically alloyed 93W-5.6Ni-l.4Fe powders showed larger elongation of 16% than that of 1% in the solid state sintered tungsten heavy alloy due to the increase in matrix volume fraction and decrease in W/W contiguity. Dynamic torsional tests of the two-step sintered tungsten heavy alloys showed reduced shear strain at maximum shear stress than did the sintered tungsten heavy alloys using the conventional liquid phase sintering.

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“…The relevant data are shown in Figure 26. The same example was simulated by Batra and Peng [47] and Erhart et al [8]. A uniform discretization with 800 or 1800 elements is adopted.…”

Section: High Strain Rate Compression Of a Wha Blockmentioning

confidence: 99%

Two‐scale method for shear bands: thermal effects and variable bandwidth

Areias

Belytschko

2007

Numerical Meth Engineering

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SUMMARYA method for the analysis of shear bands using local partition of unity is developed in the framework of the extended finite element method (XFEM). Enrichments are introduced for both the displacement field and the thermal field. The shear band width is determined by minimizing the plastic work. A coupled finite strain thermo-elastoplastic constitutive law is used. The enrichment is injected into the mesh when the material law becomes unstable. The criterion based on a complete stability analysis for materials in the finite strain regime including heat conduction, strain hardening, strain rate hardening and thermal softening is presented. A mixed continuous quadrilateral element is employed. The method is applied to the Nesterenko experiments, which exhibit multiple propagating shear bands and other problems.

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Development of shear bands in dynamic plane strain compression of depleted uranium and tungsten blocks

Cited by 27 publications

References 6 publications

Adiabatic shear bands in the Taylor impact test for a WHA rod

Adiabatic shear bands in the Taylor impact test for a WHA rod

Microstructural control of and mechanical properties of mechanically alloyed tungsten heavy alloys

Two‐scale method for shear bands: thermal effects and variable bandwidth

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