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2016-01-01

Farbaniec, Lukasz, Hogan, James D., McCauley, James W., Ramesh, Kaliat T.

Effects of microstructure and material properties on the mechanical behavior of hot-pressed boron carbide are presented. The microstructure and intrinsic microstructural inhomogeneities have been characterized using scanning electron microscopy characterization techniques (SEM/EDS/EBSD). In-situ...

2017-01-01

Farbaniec, L., Hogan, James D., Xie, K.Y., Shaeffer, M., Hemker, K.J., Ramesh, K.T.

The dynamic response of hot-pressed boron carbide was studied under uniaxial and confined loading conditions using a modified compression Kolsky bar setup at strain rates of 102 – 103 s–1. The progression of damage in the prismatic specimens was captured using a high-speed camera. This...

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....

2017-04-01

Hogan, James D., Farbaniec, Lukasz, Mallick, Debjoy, Domnich, Vladislav, Kuwelkar, Kanak, Sano, Tomoko, McCauley, James W., Ramesh, Kaliat T.

In this paper, the impact-induced fragmentation of a commercially available hot-pressed boron carbide is explored. Fragmentation has been noted previously by many authors to be important in the impact performance of advanced ceramics, and so this paper seeks to provide some of the first...

2015

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...

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...

2019-01-03

Krimsky, Erez, Ramesh, K.T., Bratcher, M., Foster, M., Hogan, James D.

An understanding of the dynamic failure of damaged ceramics is important in protection applications, where the interaction of the projectile with cracked material is a contributing factor in the overall system performance. In this paper, we investigate the effects of pre-existing internal cracks...

2016

Ramesh, K., Farbaniec, Lukasz, Hogan, James D., Sano, Tomoko, Shaeffer, Matthew

This study investigates the effects of the processing-induced defect population on the dynamic compressive strength and failure of a hot-pressed boron carbide. Quantitative microscopic analysis was used to determine the distributions of three types of processing-induced inhomogeneities: aluminum...