We are pleased to announce that Patrick Kurzeja, senior researcher at Institute of Mechanics at the TU Dortmund (GER), will give the SFB 1313 "Pretty Porous Science Lecture" #51. His talk will be on "Materials design inspired by rock physics: harnessing local flow in buckling structures".
Date: 7 March 2024
Time: 4:00- 5:00 pm CET
Speaker: Dr. Patrick Kurzeja, TU Dortmund (GER)
Lecture title: "Materials design inspired by rock physics: harnessing local flow in buckling structures"
Place: Multi Media Lab (MML), U1.003, Pfaffenwaldring 61, 70569 Stuttgart, Campus Vaihingen. If you are interested in participating in the lecture, please contact edward.coltman@iws.uni-stuttgart.de
Hybrid Access: (Webex presentation)
Abstract
Attenuation at low frequencies is a key for the safe operation of, e.g., multistory buildings, aircraft and machinery. Interestingly, an attenuation mechanism at low frequencies is observed in saturated porous media, namely, in the form of squirt flow or local flow. Natural structures such as fluid-saturated rocks show energy loss due to fluid exchange between pores of different compliance. The present work uses this natural mechanism in elastic structures with instabilities by design. Instabilities at the pore level even allow the amplification of the local-flow effect beyond the limit of natural materials. Silicone samples can illustrate the basic requirements that make artificial pore geometries prone to local flow. Numerical simulations then demonstrate the impact of various geometric and material parameters. A key to maximum attenuation is the fluid-structure interaction inside the pores. The fluid viscosity and permeability between the pores determine the main frequency of attenuation. The solid-fluid stiffness ratio determines how much energy can be dissipated but also whether instabilities can evolve to trigger local flow at all.
References:
P. Kurzeja, B. Quintal (2023), Harnessing local flow in buckling pores for low-frequency attenuation, International Journal of Solids and Structures 285, 112508. (Article)
T. Cohen, P. Kurzeja, K. Bertoldi (2017), Architected squirt-flow materials for energy dissipation, Journal of the Mechanics and Physics of Solids 109, 22-33. (Article)
About Patrick Kurzeja
Dr. Patrick Kurzeja is a Senior Researcher with the Institute of Mechanics at the Technical University of Dortmund.