Explanipedia

Challenges in determining the equation of state of metals. Open

R. S. Hixson, P. A. Rigg, B. J. Jensen, D. B. Hayes · 2024

Influence of the shock induced alpha-epsilon transition in Fe and the alpha-omega transitions in Ti and Zr on post-shock substructure evolution and mechanical behavior Open

George T. Gray, Ellen K Cerreta, Thomas A. Mason, P. A. Rigg, B. J. Jensen , et al. · 2024

Influence of intersititial content and stress state of the shock-induced phase transitions in Zr, Ti, and Fe Open

George T Gray Ill, Ellen K Cerreta, Larry Hull, P. A. Rigg · 2024

The influence of pressure on the high pressure phase transformation in zirconium Open

Ellen K Cerreta, J. P. Escobedo, P. A. Rigg, Frank L Addessip, Turab Lookman , et al. · 2024

Continued investigation of the solid-solid phase transitions in zirconium Open

P. A. Rigg, C. W. Greeff, George Gray · 2024

Using PDV to determine projectile velocity and integrity in a two-stage light gas-gun Open

Mark Byers, Steven Di Marino, P. A. Rigg, R. L. Gustavsen, James Esparza · 2024

Measurement and analysis of release isentropes using proton radiography (u) Open

Cynthia Schwartz, P. A. Rigg, F. J. Cherne, R. S. Hixson, Carl W Greff · 2024

Off-Hugoniot measurements are needed to further develop predictive models that accurately describe the behavior of metals undergoing phase transitions. Predictive modeling of phase transitions is essential for LANL to meet its programmatic…

Kinetics of solid-solid phase transitions in metals using proton radiography (u) Open

Cynthia Schwartz, P. A. Rigg, R. S. Hixson, B. J. Jensen · 2024

When a compressed material changes phase it doesn't do so instantly. Instead it transitions through a mixed phase as it transforms to the end state phase for a given pressure, volume and temperature. Common phase diagrams show the phase bo…

Pressure and Temperature effects on the High Pressure Phase Transformation in Zirconium Open

Ellen K Cerreta, J. P. Escobedo, III Gray, Donald W. Brown, Carl P Trujillo , et al. · 2024

At high pressure zirconium is known to undergo a phase transformation from the hexagonal close packed (HCP) alpha phase ({alpha}) to the simple hexagonal omega phase ({omega}). Under conditions of shock loading, the high-pressure omega pha…

Analysis of critical crack potential for a pressure tap in a 40mm gun breech Open

P. A. Rigg, Caitlin M. Weaver, J. A. Cordes, Ajeenah L. Haynes · 2024

Equation of state experiments in extreme magnetic fields Open

Douglas Tasker, J.H. Goforth, H. Oona, C.M. Fowler, P. A. Rigg , et al. · 2024

Transient magnetic fields in excess of {approx}500 T, with sub-microsecond risetimes, may be used to isentropically compress materials to megabar pressures, opening the way to some fascinating high pressure physics experiments. Isentropic …

TIME-RESOLVED X-RAY DIFFRACTION MEASUREMENTS ON SHOCKED LIF CRYSTALS Open

P. A. Rigg, Kurt A. Zimmerman, Y. M. Gupta · 2024

Time-resolved x-ra:y diffraction measurements were carried out on shock-compressed LiF single crystals in plate impact experiments for the first time. Data (2-4 ns resolution) were obtained using an x-ray streak camera firom crystals subje…

Phase transitions in high-purity zirconium under dynamic compression Open

C. W. Greeff, Justin Brown, Nenad Velisavljevic, P. A. Rigg · 2022

In this work, we present results from ramp compression experiments on high-purity Zr that show the α → ω, ω → β, as well as reverse β → ω phase transitions. Simulations with a multi-phase equation of state and phenomenological kinetic mode…

Phase Transitions in High Purity Zr Under Dynamic Compression Open

C. W. Greeff, Justin Brown, Nenad Velisavljevic, P. A. Rigg · 2021

We present results from ramp compression experiments on high-purity Zr that show the $α\rightarrow ω$, $ω\rightarrow β$, as well as reverse $β\rightarrow ω$ phase transitions. Simulations with a multi-phase equation of state and phenomenol…

Shock-reshock of zirconium to explore the effect of microstructure on the alpha-omega phase transformation Open

Benjamin Morrow, J. P. Escobedo, David R. Jones, Carl P Trujillo, Daniel T. Martinez , et al. · 2021

Phase transformations play an important role in the mechanical behavior of materials subjected to extreme loading conditions. A series of shock-reshock experiments were fielded to determine whether the phase transitions in materials are si…

Real-Time Observation of Stacking Faults in Gold Shock Compressed to 150 GPa Open

Surinder M. Sharma, Stefan J. Turneaure, J. M. Winey, P. A. Rigg, Nicholas Sinclair , et al. · 2020

A microscopic-level understanding of the high-pressure states achieved under shock compression, including comparisons with static compression, is a long-standing and important scientific challenge. Unlike hydrostatic compression, uniaxial …

The Dynamic Response of Polymers Interrogated by 3rd Generation X-ray Light Sources Open

Andrew Abbott, Brittany Branch, Eric Brown, Carl Carlson, B. E. Clements , et al. · 2019

Future predictive models of materials response under extreme conditions will be increasingly phaseand microstructure-aware. As such, model development and validation will require new types of experimental data that probe responses at latti…

Structural Transformation and Melting in Gold Shock Compressed to 355 GPa Open

Surinder M. Sharma, Stefan J. Turneaure, J. M. Winey, Yuelin Li, P. A. Rigg , et al. · 2019

Gold is believed to retain its ambient crystal structure at very high pressures under static and shock compression, enabling its wide use as a pressure marker. Our in situ x-ray diffraction measurements on shock-compressed gold show that i…

The laser shock station in the dynamic compression sector. I Open

Xiaoming Wang, P. A. Rigg, J. D. Sethian, Nicholas Sinclair, N. Weir , et al. · 2019

The Laser Shock Station in the Dynamic Compression Sector (DCS) [Advanced Photon Source (APS), Argonne National Laboratory] links a laser-driven shock compression platform with high energy x-ray pulses from the APS to achieve in situ, time…

Path dependency of phase transformations Open

Ellen K Cerreta, F. L. Addessio, Curt A. Bronkhorst, David R. Jones, Turab Lookman , et al. · 2018

At high pressures titanium and zirconium are known to undergo a phase transformation from the hexagonal close packed (HCP), alpha-phase to the simple-hexagonal, omega-phase. Under conditions of shock loading, the high-pressure omega-phase …

In-situ Experiments to Capture the Evolution of Microstructure During Phase Transformation of Titanium Under Dynamic Loading Open

Benjamin Morrow, David R. Jones, P. A. Rigg, George T. Gray, Ellen K Cerreta · 2018

Under sufficient stresses, such as during dynamic loading, titanium experiences a phase transformation from hcp alpha phase to hexagonal omega phase. Omega phase is often retained in the microstructure after unloading, and has a strong inf…

The effect of surface heterogeneities in exploding metal foils Open

William Neal, Nathaniel Sanchez, B. J. Jensen, John R. Gibson, J.W. Romero , et al. · 2018

During the electrical explosion of bridge-wires and bridge-foils, the metal bridge undergoes rapid resistive-heating. The metal is rapidly expanded through solid, liquid, vapour and plasma phases. This study uses ALEGRA MHD, a Sandia Natio…

Equation of State and Damage in Polyethylene Open

Joshua D. Coe, Eric Brown, Carl Cady, Carl Carlson, B. E. Clements , et al. · 2017

The dynamic response of polymers differs significantly from those of metals, upon which many of the National Laboratories' deformation, damage, and failure models are based. Their moduli, yield strength, and damage characteristics are high…

Shock and Microstructural Characterization of the $$\alpha$$ α – $$\omega$$ ω Phase Transition in Titanium Crystals Open

Benjamin Morrow, P. A. Rigg, David R. Jones, F. L. Addessio, Carl P Trujillo , et al. · 2017

Evolution of Carbon Clusters in the Detonation Products of the Triaminotrinitrobenzene (TATB)-Based Explosive PBX 9502 Open

Erik B. Watkins, Kirill A. Velizhanin, Dana M. Dattelbaum, R. L. Gustavsen, Tariq D. Aslam , et al. · 2017

The detonation of carbon-rich high explosives yields solid carbon as a major constituent of the product mixture and, depending on the thermodynamic conditions behind the shock front, a variety of carbon allotropes and morphologies may form…

Structure/property (constitutive and spallation response) of additively manufactured 316L stainless steel Open

G. T. Gray, Veronica Livescu, P. A. Rigg, Carl P Trujillo, Carl Cady , et al. · 2017

L2 Milestone 5433: Characterization of Dynamic Behavior of AM and Conventionally Processed Stainless Steel (316L and 304L) Open

George T. Gray, Veronica Livescu, P. A. Rigg, Carl P Trujillo, Carl Cady , et al. · 2016

For additive manufacturing (AM) of metallic materials, the certification and qualification paradigm needs to evolve as there currently exists no broadly accepted “ASTM- or DIN-type” additive manufacturing certified process or AM-material p…

Explosive-induced shock damage in copper and recompression of the damaged region Open

W. D. Turley, G. D. Stevens, R. S. Hixson, Ellen K Cerreta, Edward Daykin , et al. · 2016

We have studied the dynamic spall process for copper samples in contact with detonating low-performance explosives. When a triangular shaped shock wave from detonation moves through a sample and reflects from the free surface, tension deve…

A High-Rate, Single-Crystal Model including Phase Transformations, Plastic Slip, and Twinning Open

F. L. Addessio, Curt A. Bronkhorst, C. A. Bolme, Donald W. Brown, Ellen K Cerreta , et al. · 2016

An anisotropic, rate-dependent, single-crystal approach for modeling materials under the conditions of high strain rates and pressures is provided. The model includes the effects of large deformations, nonlinear elasticity, phase transfo…

Summary of Results from First Experiment on Multi-Crystal Titanium Sample Open

P. A. Rigg, Ellen K Cerreta · 2015

friction-corrected downhole pressures so that a complete categorization of fracture pressures will be available.

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