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Raja Chellappa and Team Awarded DOE-NNSA Award

Geophysical Laboratory alum, Raja Chellappa, was one of four LANL scientists to win the DOE-NNSA Defense Programs Award of Excellence. The award was presented on September 10, 2014 from Donald L. Cook, Deputy Administrator for Defense Programs.  Chellapa was a postdoctoral associate at the Geophysical Laboratory from 2007-2010.

The team included Nenad Velisavljevic, Raja Chellappa, Dana Dattelbaum, and Ramon Saavedra.  The team, lead by Velisavljevic, was recognized for their contribution toward the development of a technique for achieving high strain rate compression using gas membrane diamond anvil cells and subsequent measurements performed using the new capability.  High compression rate technique with DAC further helps bridge the strain rate gap between traditional static high pressure and dynamic compression techniques.  Using this new capability, measurements were performed on a broad range of metals, polymers, and energetic materials. The resulting data showed direct influence of compression rate on structural stability, decomposition, transformation rate, polymerization, etc., in these materials.  Information gleaned from the measurement can be applied to further develop P-T phase diagrams, equation of state calculations, and mesoscale modeling capabilities.