A5089387169- High-pressure geophysics and materials
- High-Velocity Impact and Material Behavior
- Powder Metallurgy Techniques and Materials
- Energetic Materials and Combustion
- Boron and Carbon Nanomaterials Research
- Rock Mechanics and Modeling
- Electromagnetic Launch and Propulsion Technology
- Laser-Plasma Interactions and Diagnostics
- Hydraulic Fracturing and Reservoir Analysis
- Optical properties and cooling technologies in crystalline materials
- Quantum optics and atomic interactions
- Structural Analysis of Composite Materials
- Mechanical Behavior of Composites
- Diamond and Carbon-based Materials Research
- Advanced ceramic materials synthesis
- Nonlinear Dynamics and Pattern Formation
- Advanced X-ray Imaging Techniques
- Electrohydrodynamics and Fluid Dynamics
- Iron and Steelmaking Processes
- Space Technology and Applications
- Structural Response to Dynamic Loads
- Material Dynamics and Properties
- Transportation Safety and Impact Analysis
- Metal and Thin Film Mechanics
- Metallurgical Processes and Thermodynamics
Sandia National Laboratories California
2023-2024
Los Alamos National Laboratory
2018-2020
Georgia Institute of Technology
2018-2020
When a system comprised of cells, carbon black nanoparticles, and delivery molecules is irradiated with laser beam, the nanoparticles can absorb dissipate laser-delivered energy, producing thermal acoustic output fluid mechanical forces. These then interact nearby cell membrane, forming membrane pores that exogenous diffuse through access cytosol. This process, “nanoparticle-mediated photoporation,” cause bio-effects like intracellular and, at more extreme conditions, loss viability. Through...
Shock compression of granular ceria (CeO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> ) was studied in converging cylindrical geometry using LANL proton radiography, and driven by the Precision High Energy-Density Liner Implosion Experiment (PHELIX) magnetic implosion system. PHELIX delivered nearly 4 MA to a 1.25-mm thick liner-impactor magnetically accelerate it ~0.8-1.0 mm μs <sup xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup>...
The compressive strength of near-solid cerium (IV) oxide (CeO2) under dynamic uniaxial strain compression is investigated in the stress range 2 - 22 GPa. Shock wave velocities through sample and particle velocity histories at sample/window interface are determined using laser velocimetry. A two-wave structure observed higher peak stresses, indicating an elastic-inelastic response. Hugoniot elastic limit (HEL) as a function Experimental results compared with diamond anvil cell (DAC)...
The uniaxial strain dynamic densification behavior of cerium dioxide powders as a function powder compact green density is investigated in this work. Cerium two particle morphologies (rod-like and equiaxed) densities (55% 62.5% TMD) are shock compressed using the gas gun with specifically designed fixtures their wave velocities measured VISAR multiple PDV probes. obtained data describe Hugoniot shocked powders. method used to produce high fidelity for discussed preliminary shown.
The PHELIX portable pulsed power driver has recently completed a set of experiments examining the response granular material to convergent shock loading. Here nearly 4 MA peak current is delivered Z-pinch load with quarter wave cycle time ~3 us. This produces B ~ 0.30 MG field at surface cm diameter, 1 mm thick, 3 tall Al liner. liner accelerated ~800 km/s before impacting target cylinder filled fine-grain CeO <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Three continuum compaction models are calibrated to planar impact data for CeO2 powder and used predict the shock behavior of under cylindrically converging wave loading. All experiments computations performed on compacts with an initial pressed density 4.0 g/cm3 (56% TMD). A magnetically-driven, cylindrically-converging experiment is computationally designed using in multi-physics code FLAG. Magnetohydrodynamic (MHD) calculations conditions a circuit model The first cylindrical executed...
The effect of bulk initial density (ρ00) on the dynamic densification behavior a brittle granular system, cerium dioxide (CeO2), is investigated. Specifically, consolidation pressed powder compacts at three densities, 33, 55, and 63% theoretical maximum (TMD), examined shock compressed densities within compaction range via gas gun driven plate-on-plate impact experiments. Hugoniot data collected from these experiments are presented used to calibrate P-α models. dependency model parameters...
The PHELIX portable pulsed power driver has recently completed a set of experiments examining the response granular material to convergent shock loading. Here nearly 4 MA peak current is delivered Z-pinch load with quarter wave cycle time ~3 μs. This produces B ~ 0.30 MG field at surface cm diameter, 1 mm thick, 3 tall Al liner. liner accelerated ~800 km/s before impacting target cylinder filled fine-grain CeO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A framework for predicting the dynamic densification response of initially porous granular materials over a range initial densities is presented. Key features compaction as reported in literature are used to define scope and bounds present framework, which includes restriction with fractional less than 0.57. The developed within construct P-α model that has single free parameter, PC , applied available data CeO2 at 0.28, 0.33, 0.56. Predictions alternate come from assuming functional...