Determination of Dynamic Response of Ceramics and Ceramic-Metals Under Shock Compression and Spall
Abstract
A new composite armor concept that encompasses an extremely hard first layer to deform the projectile, an orthotropic second layer to slow down the shock wave propagation, a third porous layer to absorb the shock wave energy through PV-work, and a fourth layer to provide confinement for the porous medium has been conceived. Ceramic Corbit-98 and Ceramet Tungsten Carbide were selected as candidate materials for the first layer and these were the focus of this research. Dynamic loading responses of the material studied were determined through planar impact experiment conducted on a single stage light-gas gun at NPS Impact Physic Lab. Impact velocities ranged from 0.2 to 0.35 km/s. The impactor material for asymmetric experiments was z-cut single crystal sapphire. Diagnostic used included a VISAR system, to measure particle velocities, PZT pins to measure onset of impact, and contact pins to measure impactor velocities and tilt angles. Through this study, dynamic loading response of ceramic Corbit-98 and ceramet tungsten carbide were determined. The Hugoniot EOS for Corbit-98 ceramic and GC-915 tungsten carbide were measured to be Us 0.959*Up y10.57 and Us 10.2*Up y5.42, respectively. The Hugoniot Elastic Limit (HEL) of GC-915 was found to be 0.935 GPa and spall strength of approximately 2 GPa was also measured.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2010
- Accession Number
- ADA536294
Entities
People
- Chin W. Tan
Organizations
- Naval Postgraduate School