A5040439606- Energetic Materials and Combustion
- High-pressure geophysics and materials
- Combustion and Detonation Processes
- Structural Response to Dynamic Loads
- Diamond and Carbon-based Materials Research
- High-Velocity Impact and Material Behavior
- Engineering and Material Science Research
- Probabilistic and Robust Engineering Design
- Structural Analysis and Optimization
- Graphite, nuclear technology, radiation studies
- Earthquake Detection and Analysis
- Innovations in Concrete and Construction Materials
- Laser-Plasma Interactions and Diagnostics
- Vibration and Dynamic Analysis
- Earthquake and Tsunami Effects
- Forensic Fingerprint Detection Methods
- Boron and Carbon Nanomaterials Research
- Advanced Chemical Sensor Technologies
- Transportation Safety and Impact Analysis
- Structural Analysis of Composite Materials
- Nuclear and radioactivity studies
- Analytical Chemistry and Sensors
- Seismic Performance and Analysis
- Ion-surface interactions and analysis
- Geotechnical Engineering and Underground Structures
Lawrence Livermore National Laboratory
2005-2024
Oak Ridge National Laboratory
2005
Defense Systems (United States)
2005
Analysis Group (United States)
2005
We present laser-driven shock Hugoniot measurements of single-crystal (SC) 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) between 15 and 83 GPa, spanning pressures below well above the Chapman–Jouguet pressure ∼28 GPa for TATB formulations (TATB grains mixed with plastic binders at 5–10 wt. %). The new SC data are generally ∼3% more compressible than previously published on neat formulated measured in gas-gun explosive-driven experiments. An exception is compressions density ∼1.5 (∼30–40 GPa),...
We explore the structural evolution of highly oriented pyrolytic graphite (HOPG) under detonation-induced shock conditions using in situ synchrotron x-ray diffraction ns timescale. observe formation hexagonal diamond (lonsdaleite) at pressures above 50 GPa, qualitative agreement with recent gas gun experiments. First-principles density functional calculations reveal that uniaxial compression, energy barrier for transition toward is lower than cubic diamond. Finally, no indication was...
We present measurements of diamond formation in doubly shocked Stycast 1266 epoxy (comprising C, H, Cl, N, and O) using situ x-ray diffraction. Epoxy samples were reshocked against a LiF window to pressures between 80 148 GPa experiments at the Omega Laser Facility. The pressure temperature conditions diagnosed velocimetry optical pyrometry, respectively. X-ray diffraction patterns compressed are consistent with cubic (Fd3¯m), indicating that can precipitate not only from twice-shocked CH...
We present a new experimental technique to measure the force-time history of high-velocity impacts and high pressure blast waves. The is based on classic Hopkinson-type strain bar, coupled with an interferometric velocimeter instead gauges. major benefits this setup are its accuracy, temporal resolution, imperviousness electromagnetic interferences. explain keys concepts behind describe setup. numerical data as proof-of-concept discuss preliminary studies effect plastic deformation bar...
This paper proposes a quantitative measure and mathematically reproducible definition of structural robustness as it pertains to structure's ability minimize the potential for progressive collapse. Structural is defined by withstand any unforeseen loading well initiating damage scenarios without disproportionate response. Presented here study that finds in absence specific collapse load unknown location extent damage, can be minimized employing concept safety reliability, which are all...
We explore the response of insensitive high explosive (IHE) 1,3,5-Triamino-2,4,6- trinitrobenzene (TATB) under detonation-induced shock conditions using in-situ synchrotron X-ray diffraction in 100 ns time scale either a conventional or colliding detonation drive. In all experiments on various sizes and morphologies TATB, we observe an extended stability TATB triclinic crystal structure. As front passes through indicates portion exhibits compression up to 30+ GPa, followed subsequently by...
In this paper we present structural analysis of an aluminum-backed curtain wall system to inform blast-resistant design practice. This focuses on the expected material response aluminum support a set typical blast loadings used in U.S. government criteria for domestic projects. Dynamic experiment test results samples are with three-dimensional finite element hydrocode account over-strength, dynamic strengthening, and post-failure aluminum. The shows that member under high-rate (blast)...
Hydrocarbon vapor-phase explosions have long been known to create destructive overpressure and impulse loads when ignited both inside outside buildings. This creates a hazard building structural elements personnel. We recently implemented the Baker-Strehlow Baker-Strehlow-Tang curves into our Blast Analysis Module (BAM) code which computes performance of members exposed air-blast determine component level damage. A case study on design an internal laboratory cell accidental explosion...