Each seminar highlights a different speaker who will discuss their latest research projects, cutting-edge technology or what is happening within certain technological industries. These industries include biomedical technologies or microsystems, assistive technologies, automation and intelligent systems, unmanned systems, advanced manufacturing and composite materials.
Abstract:
The development of advanced materials with desired mechanical properties requires a fundamental understanding of the physics of deformation and failure behavior of materials over a wide range of lengths and time scales. Measurement of strength at high dynamic pressures is critical for applications such as space shielding, hypersonic vehicles, and armor protection. However, the experimental techniques to investigate the strength of materials at high pressures are limited.
This talk will present the recent advancements in pressure shear plate impact (PSPI) technique to study the material behavior at high dynamic pressures involving shock waves. The high-pressure PSPI experiments provide a unique methodology for extracting the complete stress-strain behavior of materials at pressures approaching 50 GPa. The results from experiments on oxygen-free high conductivity (OFHC) copper at pressures ranging from 10 to 43 GPa and strain rates 105 s−1
will be presented. A strong pressure hardening in strength is observed in copper, which cannot be explained using existing models. The experimental results reveal the scaling of shear modulus and strength are quite different, previously assumed to be the same. The atomistic mechanisms responsible for pressure-dependent strength are explored using molecular dynamics simulations.
Bio:
Dr. Suraj Ravindran is currently an Assistant Professor in Aerospace Engineering and Mechanics at the University of Minnesota- Twin Cities. Before joining the University of Minnesota, Dr. Ravindran was a postdoctoral scholar at the Graduate Aerospace Laboratories, California Institute of Technology (GALCIT). He received his Ph.D. in mechanical engineering from the University of South Carolina in 2018. Dr. Ravindran is currently a member of the junior editorial board of Engineering Fracture Mechanics. He was recognized for his research in energetic materials and high-pressure strength of materials with the Society for Experimental Mechanics’ R. E. Peterson award twice for the best paper published in the Journal of the Dynamic Behavior of
Materials in 2018 and 2021. Dr. Ravindran’s research interests are in the mechanics of materials at extreme pressures, strain rates, and temperatures.
Date:
February 24, 2023
Time:
12:00pm
Location: