Adiabatic shear bands in plane strain deformations of a WHA

Batra, R.C.; Wilson, Nina

doi:10.1016/s0749-6419(97)00039-9

Cited by 11 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar approach was followed by Becker (2004), who extrapolated the available data at intermediate strain rates to model the shock response of polycrystalline tantalum using crystal plasticity theory. Macroscopic viscoplastic models are also typically extrapolated to address very high strain rates within shear bands (Batra and Wilson, 1998) and early stages of pressure-shear experiments (Zhou et al, 1994), for which model calibration data at very high strain rates in excess of 10 6 s À1 is unavailable. The difficulty arises from the unavailability of physical experiments supplying homogeneous stress-strain behavior at such high rates.…”

Section: Article In Pressmentioning

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

View full text Add to dashboard Cite

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, ...

show abstract

Section: Article In Pressmentioning

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

View full text Add to dashboard Cite

show abstract

“…6 The evolution of temperature with cutting speed Temperature plays an important role in tool wear. Cutting temperature was measured using nature-thermocouple method [3]. Fig.…”

Section: Experimental Methods and Devicesmentioning

confidence: 99%

Experimental Study of Green High-Speed Turning Nickel-Based Superalloy GH4169

Zhou

Han

2010

AMM

View full text Add to dashboard Cite

Knowing the stringent operating conditions to which superalloys are subjected to in automobile, aerospace and gas turbine industries, the machinability of nickel-based superalloy GH4169 is very poor, the traditional cutting fluids in GH4169 machining pollutes environments. The purpose of this study is to clarify the possibility of the turning in high speed (vc＞50m/min)[1]. In particular, the effects of the overheat water vapor with 130°C as cooling lubricant application were examined, through observation and measurement of the shape of the generated chips, machined surface integrity, cutting force and cutting temperature in a series of experiments with dry cutting or overheat water vapor with 130°C as cooling lubricant. As a result of these experiments, it was possible to measure and confirm the effects of the overheat water vapor with 130°C as cooling lubricant in high speed turning.

show abstract

“…Batra and Stevens [17] have also compared the deformations of WHA and depleted uranium rods penetrating into a rolled homogeneous armor plate with each material modeled as homogeneous, isotropic, and thermoviscoplastic. Batra and Wilson [18] studied plane strain thermomechanical deformations of a WHA specimen with rectangular NiFe particles randomly distributed in and perfectly bonded to the W matrix.…”

mentioning

confidence: 99%

Mesoscale Analysis of Shear Bands in High Strain Rate Deformations of Tungsten/Nickel-Iron Composites

Batra

Love

2005

Journal of Thermal Stresses

View full text Add to dashboard Cite

We analyze the initiation and propagation of adiabatic shear bands in a tungsten heavy alloy by modeling each constituent as a heat-conducting, microporous, isotropic, elastothermoviscoplastic material. The two constituents are assumed to be perfectly bonded to each other so that the temperature, heat flux, displacements, and surface tractions are continuous across an interface between a tungsten particulate and the nickel-iron matrix. Three different modes of deformation, namely plane strain tension=compression, plane strain shear, and axisymmetric tension=compression are analyzed. No other defects are introduced. It is found that contours of the rate of temperature rise and=or velocity and=or the specific energy dissipation rate rather than those of effective plastic strain delineate the shear banded regions. For the same volume fraction of particulates smaller diameter particulates enhance the formation of adiabatic shear bands. The time of initiation of an adiabatic shear band also depends upon the particulate arrangement.

show abstract

Adiabatic shear bands in plane strain deformations of a WHA

Cited by 11 publications

References 15 publications

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

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

Experimental Study of Green High-Speed Turning Nickel-Based Superalloy GH4169

Mesoscale Analysis of Shear Bands in High Strain Rate Deformations of Tungsten/Nickel-Iron Composites

Contact Info

Product

Resources

About