AEM Special Seminar: Suraj Ravindran

[Hanna Pahr]

Suraj Ravindran

California Institute of Technology

Tuesday, February 1st, 2022

2:30-3:30pm

3-180 Keller Hall

Strength of Materials under High Dynamic Pressures

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 and pure iron at pressures ranging from 10 to 43 GPa and strain rates ∼ 105s-1 will be presented. A strong pressure hardening in strength is observed in both copper and iron. The experimental results reveal that the scaling of shear modulus and strength are quite different for copper, previously assumed to be the same. While for iron, the scaling appears to be consistent with previous shear modulus scaling assumptions. The atomistic mechanisms responsible for pressure-dependent strength are explored using molecular dynamics simulations.

For more information on Suraj Ravindran, please see: 

https://scholar.google.com/citations?user=ooZIYpYAAAAJ&hl=en

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

This event is part of several Special Seminars in January and February on 2/1, 2/8, and 2/10.  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.

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Hanna Pahr (She/Her/Hers)
Executive Operations & Undergraduate Student Services Specialist

University of Minnesota

Department of Aerospace Engineering and Mechanics

107 Akerman Hall / 110 Union Street

Minneapolis, MN 55455