Seminar – High Temperature Split Hopkinson (or Kolsky) Bar Techniques – Dr. Bo Song

High Temperature Split Hopkinson (or Kolsky) Bar Techniques

Bo Song

Sandia National Laboratories

Abstract

Abnormal thermal-mechanical environment requires a thorough understanding of mechanical response of alloys at high strain rates and elevated temperatures for optimization of manufacturing process, e.g., forging process, and safety design and analysis in high-temperature applications.  Split Hopkinson bar, also called Kolsky bar, has been extensively utilized for mechanical characterization of materials in a variety of loading modes, e.g., compression, tension, or shear, at high strain rates.  However, it has been challenging to conduct high-rate characterization of materials in compression at high temperatures, particularly at temperatures over 600C, with Kolsky bar technique.  High-rate, high-temperature Kolsky tensile bar experiments is even more challenging than compression tests.  In this seminar, high-rate high-temperature compressive and tensile Kolsky bar techniques, recently developed at Sandia National Laboratories, will be presented.  As an example, 304L stainless steel was characterized in compression at high strain rates and elevated temperatures with controlling quenching times to simulate whole forging process.  In addition, a DOP-26 iridium alloy was characterized in tension at high strain rates and high temperatures up to 1030C for safety analysis on its abnormal thermal-mechanical applications.

Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.

Biography

Dr. Bo Song is currently a Principle Member of Technical Staff at Sandia National Laboratories.  He obtained his Ph.D. in solid mechanics from the University of Science and Technology of China in 2000.  Before he joined to Sandia California in 2008, Dr. Song had worked as Postdoctoral Research Associate, Research Assistant Professor at the University of Arizona, and Senior Research Scientist at Purdue University.  In 2013, Dr. Song moved from California to Sandia New Mexico.  Dr. Song has been working on experimental impact mechanics, particularly Kolsky bar techniques, and dynamic behavior of materials and structures for over 20 years.  In addition to one book, Dr. Song has also co-authored over 100 publications including book chapters, journal articles, and conference papers. He is currently an Associate Editor of Journal of Dynamic Behavior of Materials and Fellow of the ASME.