AEM Seminar: TODAY, November 15th - Prof Ibrahim Guven, Dept of Mechanical & Nuclear Engineering, Virginia Commonwealth University

[Molly Schmitz]

University of Minnesota

Aerospace Engineering and Mechanics
Fall 2024 Seminar Series

Friday, November 15, 2024

43 Rapson Hall

2:30pm-4:30pm

AEM Seminar:  Predicting Damage in Aerospace Structures Due to Adverse Weather Encounters

Abstract:

There is renewed interest in hypersonic flight with applications in defense and civilian aerospace. Nontrivial chances of weather encounters with airborne particles (raindrops, ice particulates, volcanic ash) exist at lower altitudes. Predicting structural damage due to raindrops at hypersonic velocities is an open problem owing to the complex multiphysics involved. This talk will first describe the physics of the high-speed droplet impact and then demonstrate a computational solid mechanics approach, peridynamics, for damage predictions. Droplet-shock layer interactions, coupling with computational fluid dynamics, 2D vs. 3D, and other relevant topics will be discussed. 

Bio:

Ibrahim Guven is an Associate Professor of Mechanical and Nuclear Engineering at Virginia Commonwealth University (VCU). He was an Assistant Professor of Materials Science and Engineering at The University of Arizona. Ibrahim spent two summers as a Faculty Fellow at the Air Force Research Laboratory. He was a Visiting Professor at the University of Rennes I, France, multiple times. Ibrahim is a recipient of the NASA Group Achievement Award for "outstanding work in developing materials for space exploration," awarded to participants of the collaborative project he worked on: US-COMP Space Technologies Research Institute.

*Refreshments to follow in 227 Akerman Hall 

Molly Schmitz (She/Her/Hers)

Graduate Program Coordinator & Executive Accounts Specialist

Department of Aerospace Engineering & Mechanics

University of Minnesota - Twin Cities

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[Molly Schmitz]

University of Minnesota

Aerospace Engineering and Mechanics
Fall 2024 Seminar Series

Friday, December 6, 2024

43 Rapson Hall

2:30pm-4:30pm

AEM Seminar:  

Bubbles and elastic membranes in flows: From hydrokinetic energy extraction to turbulence modulation

Abstract:

The interaction of deformable materials with fluid flows can result in a variety of emergent phenomena, many of them advantageous in engineering. In this talk I will present two multiphase flow systems where interfacial mechanics contribute to enhancements in thermal and mechanical energy extraction from fluid flows. In the first part, I will discuss flow modifications that result from the introduction of a small fraction of millimetric bubbles in a turbulent flow. In the second part of the talk, I will discuss the fluid-structure interactions of a deformable (elastic) membrane in a uniform stream. I will show how an elastic membrane has many similarities to a bubble. We reveal the mechanisms by which the membrane’s elasticity, curvature and unsteady deformations could lead to an enhancement in hydrokinetic energy extraction or turbulence production in different contexts. Potential benefits of using ultra-soft materials for flow control and energy extraction will be outlined.

Bio:

Varghese Mathai is an Assistant Professor in the Department of Physics and Department of Mechanical Engineering at the University of Massachusetts, Amherst. His group’s research interests are mainly on experimental bubbly and soft material-laden turbulent flows, and on the fluid mechanics of airborne transmission.   Varghese’s research on elastic materials in turbulent flows is funded by an NSF CAREER award. His prior work has been selected for Best Research Prize in Flowing Matter by the European COST in 2019.  His recent works on airborne transmission risks has been featured in the New York Times, the Washington post, and the American Institute of Physics, and appears in CDC’s  guidelines for airborne transmission mitigation.

*Refreshments to follow in 227 Akerman Hall 

Molly Schmitz (She/Her/Hers)

[Molly Schmitz]

[Molly Schmitz]

Hi all, 

Just a reminder that there will be no more AEM 8000 Seminars for Fall 2024. 

Good luck on upcoming finals, and a safe and happy break!

[Molly Schmitz]

Hi all, 

There will be no AEM 8000 Seminar this week. 

We will be sending info about Special Seminars popping up in the coming weeks though, so please keep an eye out and attend as many of them as you can!

[Molly Schmitz]

Hi all, 

There will be no AEM 8000 Seminar this week. 

We will, however, be hosting an AEM Faculty candidate again this week - 

Michael Wadas of CalTech will be giving a Special Seminar on Tuesday, Feb. 11th, at 2:30pm in 3-180 Keller Hall.

Please try to make it if you can!

[Molly Schmitz]

Hi all, 

There will be no AEM 8000 Seminar this week. 

We will be sending info about Special Seminars though, so please keep an eye out and attend as many of them as you can!

[Molly Schmitz]

University of Minnesota

Aerospace Engineering and Mechanics
Spring 2025 Seminar Series

Friday, April 11th

209 Akerman Hall

2:30pm-4:30pm

AEM Seminar:  

Laboratory X-ray measurements in solid mechanics: any new insights?

Abstract:
A range of laboratory-based X-ray techniques ranging from energy dispersive X-ray diffraction to measure elastic strains in metals, high speed tomography of the dynamic deformation of architected solids to 3D deformation fields within rubbers will be discussed. Do these novel measurements provide any new insights into the mechanics of these materials? One example will be discussed in detail. From Hooke’s law in the 1660s to the 1930s work of Flory on polymer chains, the understanding of rubber elasticity was formalised via the Neo-Hookean model. This established the idea that, under isothermal conditions, stress is (non)linearly related to strain and no other state variable. Using innovative X-ray measurements capturing the three-dimensional spatial volumetric strain fields, we demonstrate that this idea may need to be revisited. We show that rubbers and indeed many common engineering polymers, undergo significant local volume changes. But remarkably the overall specimen volume remains constant regardless of the imposed loading. This strange behaviour, which also leads to apparent negative local bulk moduli, is due to the presence of a mobile phase within these materials. Using a combination of these tomographic observations and high-speed radiography to track the motion of the mobile phase we present a revision of the classical thermodynamic frameworks of rubber elasticity.

Bio: 

Vikram Deshpande is a professor of Materials Engineering at the University of Cambridge. He has also served on the faculties at the University of California, Santa Barbara and at the Technical University of Eindhoven. With his students and collaborators, he has worked primarily in experimental and theoretical solid mechanics and currently serves as the editor-in-chief of the Journal of the Mechanics and Physics of Solids (JMPS). His recognitions include the 2020 Rodney Hill Prize in Solid Mechanics, the 2022 Prager Medal, the 2022 ASME Koiter medal and the 2024 Bazant medal ASCE. He has been elected Fellow of the Royal Society, London, the UK Royal Academy of Engineering, and an International Member of the US National Academy of Engineering (NAE).

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