Special Seminar: Application of high-speed X-ray imaging in manufacturing and mechanics research
Niranjan Parab
2:30 PM on 2019-02-19
3-180 Keller Hall
Real-time observations of mechanical and manufacturing processes provide valuable insights into the physics that governs the material behaviors involved. Thanks to the penetrating power of the high-intensity high-energy synchrotron X-rays, important sub-surface phenomena relevant to manufacturing and mechanics research can be captured with high spatial and temporal resolutions using high-speed synchrotron X-ray imaging. In this talk, I will elaborate on the development of synchrotron based high-speed X-ray imaging techniques to record the dynamics of additive manufacturing (AM) processes and fracture behaviors of AM materials. Specifically, I will present the observations of important physical phenomena that govern the laser powder bed fusion process, including dynamics of the melt pool and vapor depression, motion and spattering of the powders, and formation of porosity and structural defects. Further, I will briefly present the observations for binder jetting AM process, focusing on various mechanisms that can lead to defects in binder jetted parts. Along with the AM processes, I will also discuss my study on the deformation and fracture behaviors of AM materials under dynamic tensile loading conditions. The X-ray imaging experiments reveal that the unique microstructures formed during the AM build process largely influence the dynamic mechanical properties of these AM materials, in comparison to their cast counterparts. Finally, I will briefly discuss future research plans and avenues for collaboration.
Bio
Niranjan Parab is a post-doctoral appointee in the X-ray Science Division at Argonne National Laboratory. His current research is focused on studying additive manufacturing processes and materials using advanced X-ray imaging and diffraction techniques. He obtained his Ph.D. in Aeronautics and Astronautics from Purdue University. His doctoral research was focused on development of innovative dynamic loading systems and experimental platform to study the fracture behavior of wide range of brittle materials. He also holds a master’s degree from Purdue University and an undergraduate degree from Indian Institute of Technology Bombay, both in Aerospace Engineering.