Microstructure-based Simulations of the High-Strain-Rate Response of Heterogeneous Ti/Al/B Reactive Powder Mixtures

Gonzales, Manny; Gurumurthy, Ashok; Kennedy, Greg; Gokhale, A.M.; Thadhani, Naresh N.

doi:10.1557/opl.2013.361

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Further details of the powders used in this study can be found elsewhere. 45 Instrumented parallel-plate impact experiments on Ti+2B powders were conducted using the 80 mm helium-driven gas gun. A set of copper capsule fixtures were prepared to contain the powder mixture during the experiments.…”

Section: Shock-compression Of Ti+2b Powder Mixtures: Experiments and mentioning

confidence: 99%

Meso-Scale Experimental & Numerical Studies for Predicting Macro-scale Performance of Advanced Reactive Materials (ARMs)

Thadhani¹,

Gokhale²,

Quenneville³

et al. 2015

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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 this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Distribution Statement A. Approved for public release; distribution is unlimited.Our collaborative, multi-disciplinary and multi-investigator research project, combines numerical simulations with time-resolved impact experiments, to determine the meso-scale mechanisms of impact-initiated reactions in Ti-Al-B based reactive materials in the form of compacts of powders of different sizes and morphologies. The major goal is to delineate how processes of localized deformation and flow, or fracture and fragmentation, create the dispersion and mixing of reactants and provide the thermal and mass transport resulting in highly exothermic Ti and B intermetallic reaction and/or oxidation reaction (Al or B). The time sequence of events associated with reaction initiation as well as subsequent interactions with the external environment are also being determined. More specifically, the influence of material-inherent elastic/plastic properties and reactant configuration (e.g., porosity, morphology, spacing, distribution, etc., created from a library of microstructures) on meso-scale mechanistic processes and the resulting macro-scale performance is being established.reactive materials shock compression high-strain-rate deformation meso-scale computations MESO-SCALE EXPERIMENTAL & NUMERICAL STUDIES FOR PREDICTING MACRO-SCALE PERFORMANCE OF ADVANCED REACTIVE MATERIALS (ARMS)Grant/Award #: HDTRA1-10-1-0038Jennifer Breidenich, Arun Gokhale, Manny Gonzales, Ashok Gurumurthy, and Naresh Thadhani ABSTRACTOur collaborative, multi-disciplinary and multi-investigator research project, combines numerical simulations with time-resolved impact experiments, to determine the meso-scale mechanisms of impact-initiated reactions in Ti-Al-B based reactive materials in the form of compacts of powders of different sizes and morphologies. The major goal is to delineate how processes of localized deformation and flow, or fracture and fragmentation, create the dispersion and mixing of reactants and provide the thermal and mass transport resulting in highly exothermic Ti and B intermetallic reaction and/or oxidation reaction (Al or B). The time sequence of events associated with reaction initiation as well as subsequent interactions with the external environment are also being determined. More specifically, the influence of material-inherent elastic/plastic properties and reactant configuration (e.g., porosity, morphology, spacing, distribution, etc., created from a library of microstructures) on mesoscale mechanistic processes and th...

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Section: Shock-compression Of Ti+2b Powder Mixtures: Experiments and mentioning

confidence: 99%

Meso-Scale Experimental & Numerical Studies for Predicting Macro-scale Performance of Advanced Reactive Materials (ARMs)

Thadhani¹,

Gokhale²,

Quenneville³

et al. 2015

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Isotropic Growth on Cartesian Voxel Grids with von Neumann Neighborhoods for Rapid Generation of Synthetic Microstructures

Payton,

Coutinho,

Gerlt

et al. 2024

Metallogr. Microstruct. Anal.

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Randomized instantiations of synthetic microstructures are needed to assess the statistical significance of microstructure variability. Algorithms that use Voronoi tessellations of random points produce synthetic polycrystalline microstructures with a less realistic appearance than random packing of spheroidal particles followed by growth-until-impingement. Additionally, Voronoi tessellations offer limited control of morphological parameters and are challenging to implement when the desired volume fraction is less than unity. However, unless additional physics-based constraints are applied, growth on a Cartesian voxel grid utilizing a von Neumann neighborhood element results in anisotropic growth that is generally not observable along the primary axes. The present work describes both analytical and empirically optimized corrections for directional growth rates and a framework for their inclusion in a synthetic microstructure generation algorithm. The presented algorithm can produce synthetic microstructures similar to those produced by random seed Monte Carlo techniques in a fraction of the computational time.

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Shock compression response of Ti+B reactive powder mixtures

Gonzales

Gurumurthy

Kennedy

et al. 2014

J. Phys.: Conf. Ser.

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Microstructure-based Simulations of the High-Strain-Rate Response of Heterogeneous Ti/Al/B Reactive Powder Mixtures

Cited by 3 publications

References 5 publications

Meso-Scale Experimental & Numerical Studies for Predicting Macro-scale Performance of Advanced Reactive Materials (ARMs)

Meso-Scale Experimental & Numerical Studies for Predicting Macro-scale Performance of Advanced Reactive Materials (ARMs)

Isotropic Growth on Cartesian Voxel Grids with von Neumann Neighborhoods for Rapid Generation of Synthetic Microstructures

Shock compression response of Ti+B reactive powder mixtures

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