Studies of the spectral and spatial characteristics of shock-induced luminescence from x-cut quartz

Brannon, P. J.; Konrad, C.H.; Morris, R.W.; Jones, E. D.; Asay, J. R.

doi:10.1063/1.331913

Cited by 53 publications

(11 citation statements)

References 20 publications

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“…Present observations displayed an emission at 500 nm, the difference in data may be due to the higher wavelength resolution of this study. The source of this nonthermal radiation is unclear and may be related to photoluminescence or cathodoluminescence [Brannon et al, 1983b]. Since no nonthermal component was observed from fused quartz, the 500-nm crystalline quartz emission may be related to breaking of long-range crystalline order or the inherent piezoelectricity of quartz.…”

Section: Resultsmentioning

confidence: 99%

Shock temperatures in silica glass: Implications for modes of shock‐induced deformation, phase transformation, and melting with pressure

Schmitt¹,

Ahrens²

1989

J. Geophys. Res.

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Section: Resultsmentioning

confidence: 99%

Shock temperatures in silica glass: Implications for modes of shock‐induced deformation, phase transformation, and melting with pressure

Schmitt¹,

Ahrens²

1989

J. Geophys. Res.

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“…The spectra are consistent with both a blackbody spectrum from the bulk sample, and a greybody spectrum due to localized hot zones; at high pressures, only the blackbody spectrum is observed. Fast-framing camera images of quartz during shock show strong luminescence from hot shear planes (Brannon et al 1983(Brannon et al , 1984 in quartz above the Hugoniot elastic limit (HEL); these were later identified with microfault zones (Gratz et al 1988 a).…”

Section: Shock Metamorphism Of Quartz: a Brief Reviewmentioning

confidence: 97%

Shock metamorphism of quartz with initial temperatures ?170 to + 1000� C

et al. 1992

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Abstract.Shock experiments on quartz single crystals with initial temperatures -170 to +1000~ showed that ambient temperature does not affect the type of defects formed but can lower the pressure of complete amorphization. The amount of glass recovered increases with both pressure and temperature, and the shock-induced phase transtbrmation of quartz is temperatureactivated with an apparent activation energy of < 60 kJ/ tool. The phase transformation is localized along three types of transformation lamellae (narrow, s-shaped, and wide) which contain fractured and/or high-pressure phases. Transformation lamellae are inferred to form by motion of linear collapse zones propagating near the shock front. Equilibrium phases, such as stishovite, were not recovered and are probably not formed at high shock pressures: the dominant transformation mechanism is inferred to be solid-state collapse to a dense, disordered phase. Melting occurs separately by friction along microfaults, but no high-pressure crystal phases are quenched in these zones. Shock of quartz thus produces two types of disordered material, quenched melt (along microfaults) and diaplectic glass (in transformation lamellae); the quenched melt expands during P-T release, leaving it with a density lower than quartz, while recovered diaplectic glass has a density closer to that of quartz. At low pressures (< 15 GPa), quartz transforms mostly by shear melting, while at higher pressures it converts mostly along transformation lamellae. We find that shock paleopiezometers using microstructures are nominally temperature-invariant, so that features observed at impact craters and the K/T boundary require in excess of 10 GPa to form, regardless of the target temperature. Shock comminution will be much more extensive for impacts on cold surfaces due to lack of cementation of fragments by melt glass; shock on hot surfaces could produce much more glass than estimated from room-temperature experiments. Because of the shock-impedance mismatch between quartz specimen * Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550, USA and steel capsule, the incident shock wave reverberates up to a final pressure. The dynamic compression process is quasi-isentropic with high strain rates. Preheating and precooling achieves final shock pressures and temperatures representative of single-shock states of room temperature quartz and of quartz on known planetary surfaces. Stress histories were calculated by detailed 1-and 2-dimensional computer simulations. The stress history throughout the sample is relatively uniform, with minor variations during unloading. Significant differences between impact pressures calculated by the shock-impedance-match method and specimen pressures calculated by computer simulations indicate the importance of modeling shock recovery experiments computationally.

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“…/j.jmps.2007 deformation at the scale of material features such as individual grains or particles, which can occur over 10 À7 -10 À2 m. For most metals and ceramics, the mesoscale is identified with the grain size, typically on the order of 10 À6 -10 À4 m. The microstructure has been experimentally observed to affect shock wave propagation and material failure in various solids in a number of instances (cf. Asay and Barker, 1974;Asay and Chhabildas, 2003;Brannon et al, 1983;Mescheryakov, 2003). Even so, the mesoscale remains difficult to probe experimentally in shock experiments due to the short time scales involved for stress waves to traverse individual grains.…”

Section: Introductionmentioning

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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Studies of the spectral and spatial characteristics of shock-induced luminescence from x-cut quartz

Cited by 53 publications

References 20 publications

Shock temperatures in silica glass: Implications for modes of shock‐induced deformation, phase transformation, and melting with pressure

Shock temperatures in silica glass: Implications for modes of shock‐induced deformation, phase transformation, and melting with pressure

Shock metamorphism of quartz with initial temperatures ?170 to + 1000� C

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

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