2022 Thayer Investiture

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Jones Seminar: Mechanical Characterization of Materials under Extreme Shock/Impact Environments

Apr

22

Friday
3:30pm - 4:30pm EST

Spanos Auditorium / Zoom

Optional ZOOM LINK
Meeting ID: 976 4289 1575
Passcode: 106651

High-fidelity mechanical characterization of materials at high strain rates is needed to evaluate material performance prior to shock and impact applications. Since developed by Kolsky in 1949, Kolsky bars have been recognized as an effective and efficient tool to evaluate mechanical performance of materials in extreme environments from low-speed crash to high speed impact, penetration, or even explosion. Although first developed for dynamic compression tests, the Kolsky bar technique has been modified and extended for characterizing material response in different mechanical environments for different applications.

In this lecture, an overview and most recent advances of the Kolsky bar technique for dynamic characterization of materials, from soft polymers to hard ceramics, are presented with focuses on stress-strain response, fracture and failure, as well as energy dissipation at different loading modes (compression, tension, and shear), stress states (unconfined and confined), and temperatures (from cold to hot). Experimental challenges and data interpretation in such dynamic characterization tests are detailed. The dynamic material property information provides not only insights for rate-dependent material model development, calibration, and validation but also recommendation of material utilization, selection, and potential optimization particularly for shock and impact applications. The path forward for mechanical characterization of advanced materials is also briefed.

About the Speaker(s)

Bo Song
Distinguished Member of Technical Staff, Sandia National Laboratories

Bo Song

Dr. Song obtained his PhD in solid mechanics from the University of Science and Technology of China. He then joined the University of Arizona as a post-doctoral research associate and later a research assistant professor. After that, Song joined Purdue University as an aeronautical and astronautical researcher and then a senior research scientist. He started at Sandia National Laboratories in 2008 and is a founder and technical lead of the Experimental Impact Mechanics Lab at Sandia, New Mexico.

Song holds a US patent and multiple DOE Technical Advances and is a recipient of a DOE/NNSA Defense Program Award of Excellence, and was the 2020/2021 Asian American Engineer of the Year. He has published two books, nine book chapters, and nearly 80 peer-reviewed journal articles. Song is a Fellow of the American Society of Mechanical Engineers (ASME) and International Association of Advanced Materials (IAAM).

Contact

For more information, contact Ashley Parker at ashley.l.parker@dartmouth.edu.