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Experiments and Constitutive Modelling of Sand Ejecta Impact
Analysis of the dynamic response of geological porous materials under shock and explosive loading is an important problem in numerous mining and...
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Extraterrestrial Impacts Creating Architectures for Life
Prebiotic chemical evolution that led to the emergence of life on primitive Earth is interlinked with the delivery of organic material through the...
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Using defects as a ‘fossil record’ to help interpret complex processes during additive manufacturing: as applied to raster-scanned electron beam powder bed additively manufactured Ti–6Al–4V
Defects in parts produced by additive manufacturing, instead of simply being perceived as deleterious, can act as important sources of information...
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Ballistic Impact Simulation of Alumina Using Smoothed Particle Hydrodynamics (SPH) Method
This study investigated the ballistic performance of alumina 99.5% plate of 5 mm thickness against an Ogival projectile through numerical simulation....
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Feedstock Delivery and Dynamics
The most commonly employed feedstocks in fusion additive manufacturing (AM) processes are wire and powder. Powders can of course be spread or...
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Soda Lime Glass Response to Projectile Impact and Damage Characterization Using Depth of Penetration Testing with a Polycarbonate Backing and Comparison to Finite Element Model
Assessment of transparent ceramic materials for armor systems requires quantitative comparative test methods. This study aimed to provide...
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Failure Analysis of Human Lower Extremity During Lateral Blast: A Computational Study
In recent military warfare, lower extremities (LE) accounted for 70% of the total combat fractures [1, 2]. Despite orthopedic blast injuries on the...
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Advances in Ejecta Diagnostics at LLNL
Renewed interest in ejecta experiments at Lawrence Livermore National Laboratory has motivated reinvestigation and refinement of historical ejecta...
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Aerogels for High-Energy-Density Physics Targets
Aerogels have been exploited in targets for inertial confinement fusion (ICF) and other high-energy-density physics (HEDP) experiments for decades,...
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Time-Resolved Characterization of Impact Testing
Time-resolved impact studies were conducted to bridge the gap between material property testing and full-scale ballistic experiments. The motivation...
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Effect of Scale, Material Strength, and Loading on Ejecta Formation from Explosively Driven Aluminum
When a shock wave reaches the free surface of a material with surface asperities, particles can be ejected from the surface. The mass and velocity of...
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Three Pearls of High-Pressure Shock Compression of Solids
To honor Prof. Thadhani’s outstanding accomplishments in shock synthesis of inorganic compounds and related subject matters, this paper highlights...
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Metal Additive Manufacturing Processes – Laser and Electron Beam Powder Bed Fusion
This chapter introduces the two main powder bed fusion (PBF)-based AM processes used for metals. The laser-based PBF and electron beam-based PBF...
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Simulation of Double-Shock Ejecta Production
We have performed continuum simulations of ejecta production from multiply-shocked metal surfaces. We describe the underlying computational...
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Ejecta Transport, Breakup and Conversion
We report experimental results from an initial study of reactive and nonreactive metal fragments—ejecta—transporting in vacuum, and in reactive and...
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Ejecta Directions and Size Information from Recent “Sweeper Wave” Data in Sn
Measurements of ejecta from a prepared Sn surface subjected to a “swee**” shock wave are analyzed. Time-resolved shadowgraphy images of the ejecta...
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Quantification of the Kinetic Energy Conversion to Temperature Increase in Metal-on-Metal Impacts up to Hypervelocity Conditions by Molecular Dynamics Simulation
The dynamic impact loading of metals goes along with energy conversion from kinetic energy to internal energy and, ultimately, temperature increase....
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Μeasurements of Sn Ejecta Particle-Size Distributions Using Ultraviolet In-line Fraunhofer Holography
Sn ejecta particle-size distributions from the break-up of a microsheet in a vacuum will be presented. The micro-sheet was created from a high...
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Peculiarities of Shockwave Ejecta in the Presence of Gas in Front of a Free Surface of a Material
We report experimental results on studies of the interactions between various gases and the mass ejected from a shock accelerated surface. While such...
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The Influence of Powder Reuse on the Properties of Nickel Super Alloy ATI 718™ in Laser Powder Bed Fusion Additive Manufacturing
Gas-atomized nickel alloy ATI 718™ powders with a nominal particle distribution of 15 to 45 µ m were used in a laser powder bed fusion (LPBF) additive...
