ENAC Seminar Series by Dr. Konstantinos Karapiperis
Event details
| Date | 17.05.2023 |
| Hour | 09:30 › 10:30 |
| Speaker | Dr. Konstantinos Karapiperis |
| Location | |
| Category | Conferences - Seminars |
| Event Language | English |
09:30-10:30 - Dr. Konstantinos Karapiperis
Postdoctoral Scholar, ETH Zürich
Bridging physics-based and data-driven modeling of granular materials
Our ability to predict the mechanical response of granular materials is key to designing geotechnical systems and mitigating geophysical hazards. It relies on understanding their mechanics across scales, from the interparticle frictional contact, and the mesoscale formation of force chains, to the continuum dissipative behavior. In the first part of the talk, I discuss how we can leverage physics-based models, furnished by a high-fidelity discrete element method, to shed light on the mechanics of geomaterials. Examples to be drawn include the development of digital twins for experiments, which are used to probe continuum properties such as fabric evolution, cyclic loading-induced instability and macroscopic stick-slip friction, and to reveal unconventional properties of “engineered” granular materials. In the second part of the talk, I focus on integrating these physics-based models with data-driven methods. In particular, I address the problem of scale bridging through a thermodynamics-informed data-driven approach, covering applications ranging from shear banding to grain fracture encountered in high-confining pressures. Finally, I tackle an inverse problem, where machine learning is utilized to encode the relationship between mechanical properties and granular shape, in view of optimizing the latter. I conclude with an outlook on the potential of hybrid physics-based and data-driven methods for tackling challenging coupled problems in geomechanics.
Short bio:
Dr. Konstantinos (Kostas) Karapiperis is a postdoctoral scholar and lecturer at ETH Zürich. He received his Diploma in Civil Engineering from NTUA, Greece, his M.Sc. also in Civil Engineering from University of California, Davis (U.S.A), and his PhD in Applied Mechanics from the California Institute of Technology (Caltech, U.S.A), where he also earned a Minor in Applied and Computational Mathematics. Awarded with a Marie Skłodowska-Curie Postdoctoral Fellowship in April 2021, Dr. Karapiperis joined the Mechanics and Materials Laboratory at ETH Zürich. His research interests include the multiscale mechanics of materials, particularly granular and geomaterials, which he studies from a hybrid physics-based and data-driven perspective.
Postdoctoral Scholar, ETH Zürich
Bridging physics-based and data-driven modeling of granular materials
Our ability to predict the mechanical response of granular materials is key to designing geotechnical systems and mitigating geophysical hazards. It relies on understanding their mechanics across scales, from the interparticle frictional contact, and the mesoscale formation of force chains, to the continuum dissipative behavior. In the first part of the talk, I discuss how we can leverage physics-based models, furnished by a high-fidelity discrete element method, to shed light on the mechanics of geomaterials. Examples to be drawn include the development of digital twins for experiments, which are used to probe continuum properties such as fabric evolution, cyclic loading-induced instability and macroscopic stick-slip friction, and to reveal unconventional properties of “engineered” granular materials. In the second part of the talk, I focus on integrating these physics-based models with data-driven methods. In particular, I address the problem of scale bridging through a thermodynamics-informed data-driven approach, covering applications ranging from shear banding to grain fracture encountered in high-confining pressures. Finally, I tackle an inverse problem, where machine learning is utilized to encode the relationship between mechanical properties and granular shape, in view of optimizing the latter. I conclude with an outlook on the potential of hybrid physics-based and data-driven methods for tackling challenging coupled problems in geomechanics.
Short bio:
Dr. Konstantinos (Kostas) Karapiperis is a postdoctoral scholar and lecturer at ETH Zürich. He received his Diploma in Civil Engineering from NTUA, Greece, his M.Sc. also in Civil Engineering from University of California, Davis (U.S.A), and his PhD in Applied Mechanics from the California Institute of Technology (Caltech, U.S.A), where he also earned a Minor in Applied and Computational Mathematics. Awarded with a Marie Skłodowska-Curie Postdoctoral Fellowship in April 2021, Dr. Karapiperis joined the Mechanics and Materials Laboratory at ETH Zürich. His research interests include the multiscale mechanics of materials, particularly granular and geomaterials, which he studies from a hybrid physics-based and data-driven perspective.
Practical information
- General public
- Free
- This event is internal
Organizer
- ENAC
Contact
- Clivia Waldvogel & Sarah Feller