Texture effects on shear response in Ti–6Al–4V plates

Schoenfeld, Scott E.; Kad, Bimal K.

doi:10.1016/s0749-6419(01)00005-5

Cited by 41 publications

(24 citation statements)

References 19 publications

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“…Historically, most crystal plasticity implementations have focused on the quasi-static loading regime, though models have been applied in the intermediate strain rate regime to address dynamic phenomena such as those occurring in Hopkinson bar experiments (Nemat-Nasser et al, 1998), Taylor impact experiments (Schoenfeld, 1998), explosive forming of polycrystalline tantalum liners (Schoenfeld, 1998), and ballistic impact of titanium armor plates (Schoenfeld and Kad, 2002).…”

Section: Background: Modeling Techniquesmentioning

confidence: 99%

Heterogeneous deformation and spall of an extruded tungsten alloy: plate impact experiments and crystal plasticity modeling

Vogler

Clayton

2008

Journal of the Mechanics and Physics of Solids

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information ARL-RP-206 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTESA reprint from the Journal of the Mechanics and Physics of Solids, vol. 56, pp. 297-335, 2008. *Sandia National Laboratories, Albuquerque, NM 87185-1181 ABSTRACTThe role of microstructure in the dynamic deformation and fracture of a dual phase, polycrystalline tungsten alloy under highrate impact loading is investigated via experiments and modeling. The material studied consists of pure tungsten crystals embedded in a ductile binder alloy comprised of tungsten, nickel, and iron. The tungsten crystals are elongated in a preferred direction of extrusion during processing. Plate impact tests were conducted on samples oriented either perpendicular or parallel to the extrusion direction. Spatially resolved interferometric data from these tests were used to extract wave propagation behavior and spall strength dependent upon position in the sample microstructure. Finite element simulations of impact and spall in digitally reproduced microstructural geometries were conducted in parallel with the experiments. Finite deformation crystal plasticity theory describes the behavior of the pure tungsten and binder phases, and a stress-and temperature-based cohesive zone model captures fracture at grain and phase boundaries in the microstructure. In results from both experiments and modeling, the grain orientations affect the free-surface velocity profile and spall behavior. Some aspects of distributions of free-surface velocity and spall strength among different microstructure configurations are qualitatively similar between experimental and numerical results, while others are not as a result of differing scales of resolution and modeling assumptions. Following a comparison of experimental and numerical results for different microstructures, intergranular fracture is identified as an important mechanism underlying the spall event. SUBJECT TERMSmicrostructures, tungsten, crystal plasticity, fracture, spall, plate impact, finite elements, probability and statistics AbstractThe role of microstructure in the dynamic deformation and fracture of a dual phase, polycrystalline tungsten alloy under high-rate impact loading is investigated via experiments and modeling. The material studied consists of pure tungsten crystals embedded in a ductile binder alloy comprised of tungsten, nickel, ...

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Section: Background: Modeling Techniquesmentioning

confidence: 99%

Heterogeneous deformation and spall of an extruded tungsten alloy: plate impact experiments and crystal plasticity modeling

Vogler

Clayton

2008

Journal of the Mechanics and Physics of Solids

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“…4 depict the simulation after impact at 1500 m/s, with properties of the plate corresponding to random grain orientations and X ¼ 1. The plug that typically emerges in perforation of ductile plates impacted at high velocity [19,27] is evident in Fig. 4.…”

Section: Terminal Ballistics Predictionsmentioning

confidence: 99%

“…The shear boundary conditions at an applied rate of _ c ¼ 10 4 =s are those deemed most crucial in a ballistic perforation event [27]. Each grain in the aggregate is sheared adiabatically under the same total deformation gradient [30,4], and each grain has the same volume.…”

Section: Coarse-grained Macroscopic Modelmentioning

confidence: 99%

“…1, while the cubic texture can be obtained in a ductile plate by rolling [34]. In a previous work [6], a number of different rolled textures [34] were considered, with cubic found to give the greatest increase in the shear stress component thought to provide the primary resistance to plug formation [19,27]. For the random texture, each grain is assigned an independent set of three Euler angles with a random number generator, providing for isotropic average behavior.…”

Section: Coarse-grained Macroscopic Modelmentioning

confidence: 99%

“…Thus, the normal strength of cubic-textured plate in the x 3 -direction and the shear stresses r 12 and r 23 may be over-or underestimated by the assumption of isotropy. However, the predictions of dynamic perforation will be accurate so long as the primary resistance to plugging is the shear stress s ¼ r 13 tangential to the penetration direction [19,27]. Also shown in Table 2 are properties for iron used to model the projectile in impact simulations that are described in Section 5.…”

Section: Coarse-grained Macroscopic Modelmentioning

confidence: 99%

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