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2013

Hogan, James, Schneider, Markus, Rogers, Robert, Spray, John, Vincent, Gregory

The dynamic fragmentation of coarse and fine grained granitoid blocks during impact has been examined for energies of 1.9 kJ to 3.0 kJ and 2.7 kJ to 6.8 kJ, respectively. A particle tracking algorithm was developed to measure ejecta size and velocity at the rear of the target for a horizontal...

2013

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...

2013-01-01

Hogan, James, Vincent, Gregory, Spray, John, Rogers, Robert, Schneider, Markus

Ejecta velocity measurements were made during impacts into solid planetary materials. Ejecta velocity fields overlie each other when normalized by vmax, v50%mass, and v50%KE; these correspond to the maximum velocity and median values of mass and kinetic energy among ejecta velocities....

Spring 2024

Islam, Saqeeb

The purpose of this thesis is to obtain a better understanding of the behavior of particles within a particle-laden turbulent channel flow, as well as evaluate the suitability of the flow facility to measure particle-laden flows. Suitability of the flow loop for measurements of particle-laden...

2014

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...

Fall 2016

Hou, Jianfeng

Riblet surfaces have been introduced as of one successful technique to reduce skin-friction. Advanced particle image velocimetry (PIV) and particle tracking velocimetry (PTV) are employed to investigate turbulent structures over riblet surfaces by several researchers including Suzuki and Kasagi...

Fall 2021

Amirian, Benhour

Advanced physics-based computational models have been developed in this thesis to study dynamic failure in novel light-weight materials used in impact applications, focusing on applying different computational techniques to study three material systems: 1. novel self-propagating high-temperature...

2014

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,...