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Skip to Search Results- 7Dynamic fragmentation
- 5Planetary materials
- 4Brittle fracture
- 4Ejecta measurements
- 4Particle tracking velocimetry
- 3Brittle failure
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2016
Lamberson, Leslie, Pagano, Steven, Hogan, James
The rate-dependent compressive response and resulting fragmentation characteristics of dry ox cortical bone and cyanoacrylate-based cortical bone surrogate material was investigated in two material orientations. Tests were conducted under quasi-static (10−3 s−1) and dynamic (103 s−1) loading in...
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2016
Farbaniec, Lukasz, Daphalapurkar, Nitin, Ramesh, K.T., Hogan, James
Dynamic brittle fragmentation is typically described using analytical and computational approaches for tensile stress-states. However, most fragmentation applications (e.g., impact, blast) involve very large initial compressive stresses and deformations. In this study, the compressive...
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2015
Stickle, Angela, Hogan, James, Kimberley, Jamie, Ramesh, K.T.
Modeling of catastrophic disruption requires understanding the processes of dynamic failure and fragmentation. This paper summarizes current mechanisms and models for dynamic failure, strength, and fragmentation, reviewing these from a mechanics perspective and with an emphasis on making links to...
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2015-01-01
Schneider, Markus, Vincent, Gregory, Hogan, James D., Spray, John G.
Linear electromagnetic acceleration has a wide range of applications. Among them are applications in the field of materials science where relatively small, inexpensive systems can be of high value. For instance, it was shown recently at the French-German Institute of Saint Louis (ISL), France,...
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Dynamic Behavior of an Ordinary Chondrite: the Effects of Microstructure on Strength, Failure and Fragmentation
Download2015
Plescia, Jeffrey, Ramesh, K.T., Hogan, James, Kimberley, Jamie, Hazeli, Kavan
Knowledge of the relationships between microstructure, stress-state and failure mechanisms is important in the development and validation of numerical models simulating large-scale impact events. In this study, we investigate the effects of microstructural constituent phases and defects on the...
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Micromechanisms Associated with the Dynamic Compressive Failure of Hot-Pressed Boron Carbide
Download2015
Ramesh, K.T., Farbaniec, Lukasz, Hogan, James
Brittle failure in boron carbide has been studied in dynamic uniaxial compression using a Kolsky bar technique. A detailed study of fragments was performed using SEM-EDS, to identify the mechanisms responsible for failure. Microstructural characterization and fracture surface observations...
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Impact Failure of Planetary Materials: Lateral Field Ejecta Measurements using Particle Image Velocimetry
Download2014
Schneider, Markus, Spray, John, Rogers, Robert, Hogan, James, Vincent, Gregory
The dynamic fragmentation of a fine grained granitoid material has been examined. Target thicknesses ranged from 7 to 40 mm and impact energies from 12 to 2,500 J. Combined particle image velocimetry and image enhancement techniques are introduced and have been used to measure the size and...
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The Effects of Microstructure and Confinement on the Compressive Fragmentation of an Advanced Ceramic
Download2014
Farbaniec, Lukasz, Shaeffer, Matt, Ramesh, K.T., Hogan, James
We investigate the rate-dependent compressive failure and fragmentation of a hot-pressed boron carbide, under both uniaxial and confined biaxial compression, using quantitative fragment analysis coupled with quantitative microstructural analysis. Two distinct fragmentation regimes are observed,...
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Dynamic Fragmentation of Natural Ceramic Tiles: Ejecta Measurements and Kinetic Consequences
Download2013
Vincent, Gregory, Rogers, Robert, Spray, John, Schneider, Markus, Hogan, James
Velocity and size measurements of ejecta derived from impacts of railgun-launched projectiles into 10 mm thick gabbro tiles are examined. Fragmentation of the target and the ejecta velocity field are found to be governed by Hertzian fracture and the transfer of kinetic energy to the target. Over...