AEM Special Seminar: TODAY, February 25th @ 11:30am - Suraj Ravindran

[Molly Schmitz]

Suraj Ravindran

PostDoc, Graduate Aerospace Laboratories, California Institute of Technology (GALCIT)

TODAY, February 25, 2021

11:30am-12:25pm

https://umn.zoom.us/j/95162321395?pwd=Mk1mcU9yYWREbWFkbzQ1ekNXSjVnUT09

Passcode: AEM2021

AEM Special Seminar: Strength of materials under high dynamic pressures

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 length 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 ~10 5 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 a postdoctoral scholar at the Graduate Aerospace Laboratories, California Institute of Technology (GALCIT), working on the high-pressure dynamic

behavior of materials. He received his Ph.D. in mechanical engineering from the University of South Carolina in 2018. He worked as an Edison Engineer in General Electric Aviation for two
years after completing his master’s in mechanical engineering at the Indian Institute of Technology, Mumbai, in 2011. During his Ph.D. research, he developed a unique experimental
technique to measure the local strain and temperatures at high spatio-temporal resolution. He was recognized for this work with the R. E. Peterson award in 2018 for the best paper published
in the Journal of the Dynamic Behavior of Materials. He was also the recipient of a Breakthrough Graduate Scholar Award from the University of South Carolina in 2017 that
recognizes doctoral students who show promise for distinguished careers in research. His research interests are in the mechanics of materials at extreme pressures, strain rates, and
temperatures.

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This event is part of several Special Seminars in February and March 2021.  We strongly encourage you to attend both the Special Seminar and the regular Seminar each week.  If you are unable to attend the regular seminar during any of these weeks, you may use your attendance of that week's Special Seminar as a make-up.  You will need to document the substitution with a brief statement giving the department, date, speaker's name and affiliation, title and summary of the Special Seminar. This statement must be emailed to aem...@umn.edu within one week of the substitute Special Seminar.

Please refer to the AEM seminar attendance policy: https://cse.umn.edu/aem/aem-graduate-handbook-0

For more information regarding current or future seminars and speakers, please visit the AEM Seminar & Events Website at https://cse.umn.edu/aem/aem-colloquium-series.

Molly Schmitz

(She/Her/Hers)

Executive Accounts Specialist & Graduate Program Coordinator

Department of Aerospace Engineering & Mechanics

107 Akerman Hall, 110 Union St. SE, Minneapolis, MN