SUNMONTUEWEDTHUFRISAT
Conferences, Lectures, & Seminars
Events for March
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AME Seminar
Wed, Mar 03, 2021 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Samantha Daly, University of California at Santa Barbara
Talk Title: Machine Learning for High-Throughput Experiment and Analysis of Processing-Property Relationships
Abstract: Materials have hierarchical and heterogeneous structures that drive their deformation and failure mechanisms. The relationship between structure and behavior -- such as the impact of the microstructure of a polycrystalline metal on twinning, dislocation slip, grain boundary sliding, and multi-crack systems -- includes complex stochastic and deterministic factors whose interactions are under active debate. In this talk, the application of data-driven approaches to microscale displacement data for the high-throughput segmentation, identification, and analysis of twinning in magnesium (a deformation mechanism that is critical to its ductility and forming) will be discussed. This will include an analysis of deformation twinning over thousands of grains per test, including an analysis of the impact of microstructure on the relative activity of specific twin variants (automatically identified from microscale strain fields) and their evolution under load. The newly developed experimental and analytical approaches are length scale independent and material agnostic, and can be modified to identify a range of deformation and failure mechanisms.
Biography: Samantha (Sam) Daly is a Professor in the Department of Mechanical Engineering at the University of California at Santa Barbara. She received her Ph.D. from Caltech in 2007 and subsequently joined the University of Michigan, where she was on the faculty until 2016 prior to her move to UCSB. The Daly group investigates the mechanics of materials, with a focus on fatigue, fracture, creep, composites, multi-functional materials, and new experimental and data-driven approaches for the characterization of processing -“ structure -“ property relationships. Her recognitions include the Experimental Mechanics Best Paper of the Year Award, IJSS Best Paper of the Year Award, DOE Early Career Award, NSF CAREER Award, AFOSR-YIP Award, ASME Eshelby Mechanics Award, Journal of Strain Analysis Young Investigator Award, ASME Orr Award, and Caddell Award. She currently serves on the Executive Board of the Society of Experimental Mechanics, and as an Associate Editor of the journals Applied Mechanics Reviews, Experimental Mechanics, and Strain.
Host: AME Department
More Info: https://usc.zoom.us/j/92448962089
Webcast: https://usc.zoom.us/j/92448962089Location: Online event
WebCast Link: https://usc.zoom.us/j/92448962089
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/92448962089
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Seminar
Wed, Mar 10, 2021 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: George Park, University of Pennsylvania
Talk Title: Toward Predictive Yet Affordable Computations of Practical Wall-Bounded Turbulent Flows
Abstract: Kinetic energy of turbulence is generated at large scales controlled by boundary conditions, but it is dissipated into heat at the smallest scales. The ratio of these two length scales increases rapidly with Reynolds number. Solid walls add another dimension in this scale landscape, where the scale separation gets progressively less pronounced toward the wall. This has significant ramifications on the cost of scale-resolving simulation of practical engineering flows, such as those found in aircraft, wind turbines, and ship hydrodynamics. Direct approaches with full resolution of length and times scales close to the wall are still infeasible with current computing power. The demand for superior designs at reduced cost has led researchers to explore alternative computational approaches that have potential to be predictive yet affordable. Large-eddy simulation (LES) is one such approach where only the energy-containing scales are resolved directly, and the effect of the unresolved motions are modeled. In practical LES calculations, subgrid-scale (SGS) models are used in conjunction with wall models to augment the turbulent shear stress, which otherwise is underpredicted on coarse grids and leads to inaccurate prediction of mean and turbulence quantities.
In this talk, I will discuss the research in my group on this wall-modeled LES approach. Widely used wall-modeling techniques will be discussed with their applications to canonical and complex wall-bounded flows. Challenges in robust and efficient implementation of the models in flow solvers for handling practical geometries will be discussed. I will also highlight recent work to predict flow over realistic aircraft geometries at flight conditions and a boundary layer with mean three dimensionality.
Biography: George Park is an Assistant Professor of Mechanical Engineering and Applied Mechanics at the University of Pennsylvania. He received his Ph.D. and M.S. in Mechanical Engineering (ME) from Stanford University in 2014 and 2011, respectively, and his B.S. in ME from Seoul National University, South Korea in 2009. He worked as a postdoctoral fellow and an engineering research associate at the Center for Turbulence Research (Stanford) prior to joining UPenn as a faculty member in 2018. His research interests include high-fidelity numerical simulation of complex wall-bounded turbulent flows, computational methods with unstructured grids, non-equilibrium turbulent boundary layers, and fluid-structure interaction.
Host: AME Department
More Info: https://usc.zoom.us/j/97491401429
Webcast: https://usc.zoom.us/j/97491401429Location: Online event
WebCast Link: https://usc.zoom.us/j/97491401429
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/97491401429
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME PhD Student Seminar
Fri, Mar 12, 2021 @ 03:00 PM - 04:00 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Samuel Goldman, USC AME PhD Student
Talk Title: A Case Study of the Failure of a Compression Spring in a Lunar Percussion Mechanism
Abstract: The Regolith and Ice Drill for the Exploration of New Terrains (TRIDENT) is a rotary-percussive drill being used on several upcoming Lunar exploration programs. Life testing of this drill resulted in the unexpected early failure of a critical compression spring, which cannot be explained by quasi-static analysis. The purpose of this work is to determine if transient dynamic behavior resulting from percussion can explain this failure. An experiment is conducted comparing the effect of various types of spacers, and it is found that a neoprene spacer allows the spring to survive more than twice as many cycles compared to metallic spacers. Additionally, the dynamic response of this system to impact is modeled using the Distributed Transfer Function Method (DTFM), and is compared to FEA and discrete element techniques. It is found that DTFM is capable of bounding the response as computed by FEA, while the discrete element model underestimates peak shear stress by more than 25% in boundary coils. FEA and DTFM both show that wave propagation within the spring could result in peak shear stresses in boundary coils that are over 20% higher than middle coils. These results suggest that percussive wave propagation can explain the early failure of this spring.
Biography: Sam Goldman is a Ph.D. student under Dr. Flashner. His research focus is primarily in modeling and experimentation of percussion mechanisms used in extraterrestrial geotechnical tools. Sam has a B.S. in Biomedical Engineering from The Ohio State University, and an M.S. in Aerospace & Mechanical Engineering from USC.
Host: AME Department
More Info: https://usc.zoom.us/s/96549200347
Audiences: Everyone Is Invited
Contact: Christine Franks
Event Link: https://usc.zoom.us/s/96549200347
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Seminar
Wed, Mar 17, 2021 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Morteza Gharib, Caltech
Talk Title: Vortex in the Eye: Thermal Effects on Fluid Mixing in the Eye
Abstract: Age-related macular degeneration (AMD) is the leading cause of central vision loss in the developed world. Wet AMD can be managed through serial intravitreal injections of anti-vascular endothelial growth factor (anti-VEGF) agents. However, sometimes the treatment is ineffective. Given that the half-life of the drug is limited, inefficient mixing of the injected drug in the vitreous chamber of the eye may contribute to the ineffectiveness. Here, we introduce thermal heating as a means of enhancing the mixing-process in the vitreous chamber and investigate parameters that potentially influence its effectiveness. Our in-vitro studies point to the importance of the location of the heating on the eye. A significant increase in the mixing and delivery of drugs to the targeted area (the macula) could be achieved by placing heating pads so that a current against gravity is induced in the vitreous. The presented results can potentially help in the development of a better strategy for intravitreal injection and improve the quality of patient care.
Biography: Mory Gharib is Hans W. Liepmann Professor of Aeronautics and Bioinspired Engineering; Chair of Graduate Aerospace Department (GALCIT); Director of Center for Autonomous Systems and Technologies. He received his B.S. degree in Mechanical Engineering from Tehran University (1975) and his M.S. 1978, in Aerospace and Mechanical Engineering from Syracuse University and his Ph.D.1983, in Aeronautics from Caltech. He joined Caltech as a professor of Aeronautics.
Professor Gharib's current research interests in conventional fluid dynamics and aeronautics include Vortex dynamics, active and passive flow control, autonomous flight, and underwater systems. His Biological flows research includes cardiovascular and ophthalmology, and medical devices.
Dr. Gharib's honors and affiliations include: Member, American Academy of Arts and Sciences; Member, National Academy of Engineering; Charter Fellow, National Academy of Inventors; Fellow, American Association for the Advancement of Science; Fellow, American Physical Society; Fellow, American Society of Mechanical EngineeringHe has received the G.I. Taylor Medal from the Society of Engineering Sciences, The Fluid Dynamics Prize from the American Physical Society and five new technology recognition awards from NASA in the fields of advanced laser imaging and nanotechnology. In 2008 he received R&D Magazine's "R&D 100 innovation award" for one of the year's best inventions for his 3-D imaging camera system. Additionally, Dr. Gharib has published more than 250 papers in refereed journals and has been issued 120 U.S. Patents.
Host: AME Department
More Info: https://usc.zoom.us/j/97398164359
Webcast: https://usc.zoom.us/j/97398164359WebCast Link: https://usc.zoom.us/j/97398164359
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/97398164359
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Advanced Manufacturing Seminar
Fri, Mar 19, 2021 @ 10:00 AM - 11:30 AM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Ming C. Leu, Keith and Pat Bailey Distinguished Professor, Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology
Talk Title: Additive Manufacturing of Advanced Ceramics: Technologies, Applications and Opportunities
Abstract: Ceramics are important engineering materials due to their unique properties such as high hardness, high-temperature resistance, and high-corrosion resistance. Additive manufacturing (AM) of ceramic material is difficult and challenging because of the high melting temperature and flaw-sensitive nature of ceramics. However, through intensive research over the past two decades, significant progress on AM of ceramics has been made. This talk will first review different categories of ceramic AM processes and recent technology advances in each category. Comparisons will be made on the advantages and limitations of each ceramic AM process category in terms of part quality, dimensional accuracy, surface finish, and material flexibility. The practical applications of various ceramic AM processes in relation to the characteristics of each process category will be described. A novel extrusion-based AM process, called Ceramic On-Demand Extrusion (CODE), which was developed in recent years by the seminar speakers research group for fabricating ceramic components with near theoretical density will be presented, including choice of support material and part fabrication with multiple and graded materials. Finally, future research needs and innovation opportunities of ceramic AM will be discussed.
Biography: The research interests of Dr Leu include additive manufacturing, 3D printing, intelligent robotics and automation, and cyber-physical manufacturing. He has published over 480 papers in referred professional journals and conference proceedings. Dr. Leu has received numerous professional awards including, among others, the International Freeform and Additive Manufacturing Excellence (FAME) Award (2020), ASME Milton C. Shaw Manufacturing Research Medal (2018), University of Missouri President Leadership Award (2017), ASME Blackall Machine Tool and Gage Award (2014), ISFA Hideo Hanafusa Outstanding Investigator Award (2008), ASME Distinguished Service Award (2004), SME University Lead Award (1994), NJIT Harlan J. Perlis Research Award (1993), NSF Presidential Young Investigator Award (1985), SAE Ralph R. Teetor Education Award (1985), as well as several best paper awards.
Host: Center for Advanced Manufacturing
More Info: https://usc.zoom.us/webinar/register/WN_-jklT28WSJ2J7rGF-jptng
Webcast: Please register for this webinar at: https://usc.zoom.us/webinar/register/WN_-jklT28WSJ2J7rGF-jptngMore Information: Adv Mfg Seminar S21_Ming Leu.pdf
Location: Online event
WebCast Link: Please register for this webinar at: https://usc.zoom.us/webinar/register/WN_-jklT28WSJ2J7rGF-jptng
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/webinar/register/WN_-jklT28WSJ2J7rGF-jptng
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Seminar
Wed, Mar 24, 2021 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Daniel Bodony, Univ. Illinois Urbana-Champaign
Talk Title: The Fluid Mechanics of Hypersonic Fluid-Structure Interactions
Abstract: The interaction of high-speed aerodynamics with thermo-mechanically compliant structures is a critical design consideration for single-use and reusable hypersonic vehicles. Historical techniques for predicting fluid-thermal-structure interaction (FTSI) are insufficient for envisioned hypersonic flight systems, leading to a resurgent effort towards understanding, modeling, and predicting FTSI-coupled systems. In this talk, we will present the impact of FTSI on two fundamental scenarios -- boundary layer transition and shock-boundary layer interaction -- informed using a combination of stability analyses and direct numerical simulation techniques. In each scenario, focus will be given to the fluid mechanics involved in the fluid-structure coupling. Supporting details on the relevant theoretical and numerical details required for accurate prediction will also be discussed.
Biography: Daniel J. Bodony is the Blue Waters Professor, Donald Biggar Willett Faculty Scholar and Associate Head for Graduate Programs in the Department of Aerospace Engineering at the University of Illinois. He received his Ph.D. in Aeronautics & Astronautics from Stanford University in 2005. After working at the NASA Ames/Stanford Center for Turbulence Research he joined the University of Illinois in late 2006 as an assistant professor. He received an NSF CAREER award in 2012 in Fluid Dynamics, is an Associate Fellow of the AIAA, and received the University of Illinois' Promotion with Distinction Award in 2020
Host: AME Department
More Info: https://usc.zoom.us/j/91084441303
Webcast: https://usc.zoom.us/j/91084441303WebCast Link: https://usc.zoom.us/j/91084441303
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/91084441303
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Seminar
Wed, Mar 31, 2021 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Joanna Austin, Caltech
Talk Title: Hypervelocity Spherically-Blunted Cone Flows in Mars Entry Ground Testing
Abstract: The intent to launch larger vehicles in future Mars missions increases the requirements for ground testing in the high-stagnation enthalpy environment encountered by the vehicle during the hypersonic phase of entry, descent and landing. During atmospheric entry, strong shock compression and high post-shock temperatures lead to significant chemical dissociation and vibrational excitation in the shock layer in front of a sphere-cone capsule, particularly near the stagnation region. For Mars missions, accurate thermochemical modeling of carbon dioxide, a principal component of the atmosphere with complex vibrational energy exchange, is particularly important. We examine the shock layer over sphere and spherically-blunted cone geometries through reacting Navier-Stokes simulations and experiments in two facilities capable of high-stagnation enthalpy, hypersonic flows simulating Mars planetary entry conditions: the T5 Reflected Shock Tunnel and the Hypervelocity Expansion Tube. A recently-developed unified model for sphere and sphere-cone behavior is first verified for high-stagnation enthalpy CO2 flows through simulations with thermal and chemical nonequilibrium. Shock standoff distance measurements in both facilities are in good agreement with model predictions. The need to account for the divergence of the streamlines in conical nozzles is highlighted and an existing model is extended to account for changes in shock curvature between parallel and conical flow. The contributions of vibrational and chemical nonequilibrium to the stagnation line density profile are quantified using the simulation results comparing three chemical kinetic models. Experimental measurement of fore- and aftbody MWIR radiation will also be discussed.
Biography: Joanna Austin is Professor of Aerospace at the Graduate Aerospace Laboratories, California Institute of Technology. She received B.E. (Mechanical and Space Engineering) and B.Sc. (Mathematics) degrees from the University of Queensland, Australia, and M.S. followed by Ph.D. (2003) degrees in Aeronautics from the California Institute of Technology. Austin then joined the faculty in the Aerospace Engineering department at the University of Illinois, becoming Associate Professor and Willett Faculty Scholar, before moving back to Caltech in 2014, where she is a co-PI in the Caltech Hypersonics Group. Austin's research is focused on fundamental problems in reactive, compressible flows across a broad range of applications including hypervelocity flight, supersonic combustion and detonation, bubble dynamics, and explosive geological events.
Host: AME Department
More Info: https://usc.zoom.us/j/99638511716
Webcast: https://usc.zoom.us/j/99638511716WebCast Link: https://usc.zoom.us/j/99638511716
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/99638511716
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
