Electromagnetic Diagnostics for In-situ Metal Additive Manufacturing
ABSTRACT :
Over recent years, advanced manufacturing (AM) of metals has become increasingly sophisticated with finer control of the build part and higher quality material properties. New manufacturing methods such as Computed Axial Lithography, directed energy deposition and powder bed fusion have enabled a wide breadth of geometries and feature sizes, such as cellular lattice structures, which exhibit impressive mechanical and thermal performance characteristics, and are particularly useful for next-generation lightweight and multi-functional engineering applications. Current characterization systems based on x-ray, optical, and mechanical interrogation struggle to measure dimensions, phase, and composition in manufacturing-relevant timescales even for relatively simple geometries and compositions. This motivates the need for new reliable and robust nondestructive measurement approaches that must form the foundation of future manufacturing processes. In this talk, I will discuss in-situ electromagnetic diagnostics that were developed at LLNL for real-time characterization of the metal AM process. Particularly I will focus on a millimeter-based technique for dynamically tracking droplets deposited during a liquid metal jetting-based droplet on-demand system. I will highlight both experimental and computational capabilities at LLNL which were employed to advance these capabilities.
ABOUT THE SPEAKER:
Dr. Saptarshi Mukherjee received the B.Tech. degree in Electronics and Communication Engineering from the NIT, Durgapur, India, in 2013, and the Ph.D. degree in Electrical Engineering from MSU, East Lansing, MI, USA, in 2018. He joined as a Postdoctoral Research Staff member and is currently working as an Applied Electromagnetics Research Scientist at Lawrence Livermore National Laboratory (LLNL). Dr. Mukherjee’s research interests include nondestructive evaluation methods in advanced manufacturing, computational geosciences, imaging, and inverse problems, and high-power microwave devices. He has authored 3 patents and over 22 technical papers. He currently serves as an American Society for Nondestructive Testing (ASNT) mentor, committee member of ASNT research and engineering councils, and current chair of the ASNT Golden Gate Section. He has served as the chair of the Electromagnetic Nondestructive Evaluation workshop at LLNL and as a session chair for 8 international conferences. He received the National Science Foundation International Research Fellowship in 2015, ASNT Graduate Fellowship award in 2017, ASNT Travel Grant award in 2018, and the Atmospheric Earth & Energy Sciences Directorate (LLNL) stand-out award in 2021.