EB3 2207 | Mechanical and Aerospace Engineering EB3 2207 | Mechanical and Aerospace Engineering

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EB3 2207

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911 Oval Drive
Raleigh, NC 27695
9195153024

September 2017

Seminar – Anomalous phonon/heat transport in low dimensional micro/nano materials – Dr. Baowen Li

September 22, 2017 @ 11:45 am - 12:45 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Baowen Li Rennie Family Endowed Professor Department of Mechanical Engineering, University of Colorado, Boulder Baowen.Li@Colorado.Edu   When system dimension and size go down, many interesting phenomena can happen. Both experimental and numerical works in recent years have shown that phonon/heat transport in low (quasi 1D and 2D) dimensional nano structures like nanotube, nanowire, polymer chain, graphene, and other 2D materials show anomalous behavior: (a) heat conduction due to phonons does not follow the Fourier law; (b) heat transports may break…

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August 2018

SEMINAR: Muscle-Inspired Adaptive Actuation Architectures for Efficient Robotics

August 24, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Existing actuator technologies, while well-developed for traditional applications like industrial pick and place robots, are poorly suited to wearable or human-assistive robots. These human-interactive applications present challenges including mismatches in compliance between the human user and actuation system, as well as poor system-level efficiency during low-frequency and time-varying motions like walking gaits. This talk will discuss my group’s recent progress in creating, modeling, and controlling muscle-inspired soft, fluidic actuator bundles that use a physiologically-inspired selective recruitment architecture to overcome…

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SEMINAR: Deformation and Fracture Behavior of Mammalian Teeth

August 31, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Although having nominal material properties similar to glass, tooth enamel is able to sustain cyclic occlusal loading over a lifetime. Enamel has unique hierarchical structure composed of mineral and organic phases as well as highly involved structural geometry. This talk reports on a long-term study to characterize the structure and material properties of human teeth and the implications of the results to tooth resilience. The talk would focus on several aspects including macro and micro-scale deformation and fracture characteristics,…

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September 2018

SEMINAR: Enhanced Convective Heat Transfer at the Micro Scale

September 7, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: In the last two decades, a plethora of novel engineering applications have emerged with stringent cooling requirements. High power density electronic components now dissipate heat fluxes in access of 1 kW/cm2 and require low temperature operating conditions. A range of enhanced heat transfer methods in micro domains have been explored, and, to some extent implemented. This talk will introduce cooling demand and approaches that have been explored. It will then focus on a particular enhancement techniques, namely micro scale…

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SEMINAR: Morphing and Fluid-Structure Load-Alignment for Extreme Scale Wind Turbine Design

September 21, 2018 @ 10:00 am - 11:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Fluid-structure Interaction on wind turbines are critical to their design and cost of energy, especially in the category of extreme-scale wind turbines (≥ 10-MW). A new concept is proposed which employs a downwind rotor with blades whose elements are relatively stiff (no intentional flexibility) but with hub-joints that can be unlocked to allow for moment-free downwind alignment. Aligning the combination of gravitational, centrifugal, and thrust forces along the blade path reduces downwind cantilever loads, resulting in primarily tensile loading.…

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October 2018

SEMINAR: Advances in Vehicle Safety & Mobility Leading to Autonomous Driving

October 19, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: While autonomous or driverless driving has received a lot of public attention recently, the majority of the driving for the foreseeable future remains without automation, or with a mixed environment of no and partial automation, and full automation only for a small percentage of vehicles. In all of these mixed modes of traffic, the persisting significant challenge is the safety of driving and traffic crashes, which cause about 35,000 fatalities and 2.2 million injuries annually in the United States,…

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SEMINAR: Astrodynamics Research

October 26, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: The interest in smaller satellites continues to increase, being driven by technological advances that enable the manufacturing of smaller space hardware and by the desire to lower the cost of space initiatives. ‘Cubesat’ defines a specification for the construction of a very small, low mass satellite that can be easily integrated into a p-pod launch support device. Experience in the founding of a Cubesat program at the University of Illinois will be discussed. Next, an overview of research into…

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November 2018

SEMINAR: Plasma Assisted Combustion: Progress and Challenges

November 2, 2018 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: In this lecture, the recent progresses in plasma assisted combustion, in-situ mid-IR diagnostics, and studies of low temperature plasma combustion kinetic mechanism will be discussed. The observations of plasma activated direction ignition to flame transition, cool flames, and warm flame will be presented. The direct measurements of intermediate species, elementary rate constant, and the kinetic pathways of non-equilibrium plasma by using laser absorption and Faraday rotational spectroscopy will be discussed. Development of low temperature plasma combustion kinetic mechanisms for…

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SEMINAR: Material Opportunities for Next Generation Remotely Piloted Air Vehicles

November 9, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Next-generation concepts for remotely piloted air vehicles seek to balance mission range, agility, and affordability. This increases the need for improved light-weight, low-cost structures with integrated functions. Composites which add functions like agile communication, thermal management, and aerodynamic shape change have the potential to enable mission range and agility without significantly adding weight or reducing internal payload volume. This presentation will discuss current research efforts within the Composites Branch of the Air Force Research Laboratory designed to investigate the…

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SEMINAR: Investigating Anomalous Fracture Mechanisms at the Nanoscale

November 30, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: In conventional macro-scale continuum fracture mechanics, the J-integral is defined as the divergence of the Eshelby energy-momentum tensor and has been widely used to quantify the crack driving force available from thermo-mechanical loading as well as material inhomogeneities. One advantage of using J-integral over other fracture metrics such as strain energy release rate (G) is that the J-integral is applicable even in the presence of significant material nonlinearity. However, in order to extend the concept of the continuum J-integral…

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December 2018

SEMINAR: Void Superlattice Self-organization by Chemical Freezing of Phase Separation

December 7, 2018 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Irradiation of crystalline solids by high-energy particles such as electrons, ions and neutrons disturb lattice atoms and can lead to detrimental degradation in nuclear materials by producing lattice defects of various sizes, often known as radiation damage. On the other hand, the excess energy and enhanced kinetics introduced by irradiation take the systems into states far-from-equilibrium, where several fascinating self-organization phenomena have been identified, suggesting the possibility of tailoring microstructure using irradiation. This talk focuses on the self-organization of…

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January 2019

SEMINAR: Fluid Dynamics & the US ARMY Research Office

January 18, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Dr. Matthew Munson currently serves as Program Manager for Fluid Dynamics at the U.S. Army Research Office. Fluid dynamics plays a critical role in many Army operational capabilities. Significant challenges exist for accurate and efficient prediction of flow physics critical for improved performance and future advanced capability. Army platforms are often dominated by flows with high degrees of unsteadiness, turbulence, numerous and widely separated spatio-temporal scales, and geometrical complexity of solid or flexible boundaries. In order to gain the…

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SEMINAR: Low-Dimensional, Time Delay Models of Unsteady Aerodynamics and Feed-Forward Control

January 25, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Different versions of time delay and decay models have been used to model unsteady aerodynamics and the effects of actuation on the lift of maneuvering airfoils. Recent measurements at Technion of the lift coefficient history obtained from a NACA 0018 airfoil undergoing pitching maneuvers with blowing-type active flow control were used to obtain low-dimensional models for control. Disturbance models for the lift response to pitching at different steady state blowing amplitudes were identified based on a variation of the…

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SEMINAR: Histotripsy, Imaging Guided Ultrasound Therapy for Non-invasive Tissue Removal

January 31, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Wouldn’t it be great to perform a surgery without incision or bleeding? “Histotripsy” is a new non-invasive ultrasound ablation technique. Using ultrasound pulses applied from outside the body and focused to the diseased tissue, histotripsy produces a cluster of energetic microbubbles at the target tissue using the endogenous gas pockets. These microbubbles, each similar in size to individual cells, function as “mini-scalpels” to fractionate cell and tissue structures. The overlying tissue between the target tissue and the skin is…

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February 2019

SEMINAR: Vortex-based Flow Estimation of Separated Flows

February 1, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Vortex models have been used for decades as computationally-efficient tools to investigate unsteady aerodynamics. However, their utility for separated flows—particularly, when such flows are subjected to incident disturbances—has been hindered by the trade-off between the model’s physical fidelity and its expectation for fast prediction (e.g. relative to computational fluid dynamics). In this talk, I will show that physical fidelity and speed can be simultaneously achieved by assimilating measurement data into the model to compensate for unrepresented physics. The underlying…

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SEMINAR: Challenges and Opportunities in Hypersonic Flight

February 8, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Following World War II there was a great deal of interest in high-speed flight. A number of different vehicle concepts in the supersonic and hypersonic speed range were proposed and investigated, including the rocket-powered X-1, which first broke the sound barrier, and the rocket-powered X-15 that flew at 6.7 times the speed of sound on its fastest flight. Over the years there have been numerous NASA and Department of Defense programs to advance hypersonic technologies (flying at, or faster…

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March 2019

SEMINAR: Plenoptic Cameras and Experimental Flow Diagnostics

March 22, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Simplifying complex measurements: Plenoptic cameras and the future of experimental flow diagnostics Turbulence is inherently an unsteady and 3-D phenomena, yet classical fluid dynamic measurement techniques are typically limited to 1-D and 2-D measurements. Recent advances in multi-camera 3D flow measurements, such as tomo-PIV, hold tremendous potential to explore new problems and ideas; however, these techniques tend to be complex, expensive or inflexible. This seminar will focus on an emerging technology, the plenoptic (or light-field) camera that has the…

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SEMINAR: Acoustic Metasurfaces

March 29, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Wave manipulation using artificial materials is a central topic in materials physics. Recent years have witnessed the emergence of a family of thin, 2D artificial materials, namely, metasurfaces. The concept of metasurfaces was introduced to the materials and physics communities for optical waves in 2011 with the generalized Snell's law, which opened up a new degree of freedom for optical wave manipulation. Inspired by this pioneering work, and because acoustic waves also follow the Snell's law, a flurry of…

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April 2019

SEMINAR: A “Monologue” on the Mechanics of the Vagina

April 5, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Pelvic floor disorders such as urinary incontinence, fecal incontinence, and pelvic organ prolapse represent a major public health concern in the United States affecting one third of adult women. These disorders are determined by structural and mechanical alterations of the pelvic organs, their supporting muscles and connective tissues that occur mainly during pregnancy, vaginal delivery, and aging. In this talk, I will present the research that is currently being conducted in my lab to characterize the nonlinear mechanical properties…

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SEMINAR: Ultrasound Elasticity Imaging and Therapeutics

April 12, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Elasticity imaging techniques aim at the detection of tissue abnormalities following an external, internal or inherent mechanical stimulation. By taking advantage of the additional depth information provided by ultrasound imaging, the local tissue response (i.e., displacement, strain and/or vibration amplitude) that depends on its mechanical properties can be imaged. After introducing methods for 2D and 3D strain estimation, examples will be shown on imaging of normal and pathological myocardium in finite-element models and in vivo murine, canine and human…

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SEMINAR: Aircraft Icing – Issues and Challenges

April 26, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Ice forms on aircraft not just during flights on snowy days but also on hot and humid summer days. The ice formed is transparent, so the pilot doesn’t know when it happens, and it can happen very quickly, forming complicated ice shapes that not only will reduce lift but also the angle of attack at which stall occurs. Even if lift can still sustain flight, uneven ice buildup on the two wings can produce flight control problems. Ice also…

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November 2019

SEMINAR: A Videography Journey in Ultrasonics:Vascular Imaging Innovations and Biophysical Dynamics Discoveries

November 8, 2019 @ 10:00 am - 11:00 am
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: The popularity of ultrasound in today’s clinical practice is perhaps uncontested. However, the use of ultrasound in visualizing blood flow is known to be prone to errors. The therapeutic potential of ultrasound also falls short of being considered as clinically established. Our laboratory, self-proclaimed as an R&D film crew, has actively strived to address these research issues by devising new ultrasound imaging tools for vascular diagnostic applications and by applying advanced imaging tools to unveil wave-cell interactions in therapeutic…

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January 2020

SEMINAR: A Variational Multiscale Approach for Dynamic and Adaptive Simulation of Complex Flows

January 10 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: In this talk we will present a variational multiscale (VMS) approach for performing high-fidelity simulation of complex flows. The VMS paradigm relies on the idea of decomposing the solution space into coarse-scale and fine-scale subspaces. The coarse-scale solution space depends on our choice of discretization, whereas the fine-scale solution space encompasses the remainder of the space that our discretization cannot represent. The coarse-scale solution is resolved, while the fine-scale solution is modeled using the fine-scale Green’s function. The fine-scale solution…

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SEMINAR: Engineering Interfaces To Improve Thermal Performance of Wide Bandgap Semiconductors

January 24 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Wide bandgap electronics are currently under development due to their potential to create some of the most advanced RF and power electronics in the world. A key concern in their development is the control of the junction temperature during operation which is impacted by the internal device thermal resistance.  To address this concern, we will discuss advancements in thermal characterization techniques that have allowed new insights into the role of material interfaces on the thermal response of GaN and…

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February 2020

SEMINAR: Materials Challenges for the Next Generation Thermal Barrier Coatings

February 7 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: One of the major successes of engineered ceramics has been the development of the thermal protection system for high-temperature gas turbines. For the last twenty-five years, the ceramic material of choice as a thermal barrier coating has, and continues to be, yttria-stabilized zirconia containing 8 weight percent yttria (8YSZ).  As the development of more efficient gas turbines proceeds there is a need for an oxide coating that can sustain higher operating temperatures than 8YSZ. However, no existing oxide has…

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SEMINAR: Minimizing the Impact of Uncertainties on Complex Systems Operation Using Stochastic Distribution Controls Theory

February 14 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Planning for inevitable uncertainties that have the potential to negatively impact the nation’s transportation infrastructure, power grid, and manufacturing base is a major challenge. Uncertainties are, by definition, unpredictable. Therefore, it’s critical to deploy effective controls and optimizations to ensure adverse impacts caused by uncertainties are eliminated or minimized, or even utilized such as cases in power grid operation. Dr. Wang will describe how stochastic controls and probability theory can be utilized to effectively address this challenge. In addition,…

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SEMINAR: Reprocessing and Recycling of Thermosets and their Composites for Sustainable Development

February 21 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract:  Thermosets with permanent crosslinking networks have been extensively used in high-performance applications requiring thermal stability, chemical resistance, and structural integrity. However, they are extremely hard to be reprocessed and recycled using conventional methods, leading to ever-increasing contaminations in the waterways, wildlife, and human bodies. Covalent adaptable network (CAN) polymers can rearrange their macromolecular chain network by bond exchange reactions (BERs) with a simple stimulus (e.g. heat, light), which attribute to unusual properties that are not seen in conventional thermosets.…

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SEMINAR: Biomechanics of Atherosclerotic Plaque Rupture

February 28 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Fibrous cap rupture and the ensuing thrombus formation accounts for more than 50% of all cardiovascular deaths in the United States. While coronary calcification is clinically related to poor prognosis and used as a marker for the advancement of the disease it has not been successfully correlated with cap rupture. In a series of studies, we investigated the role of microcalcifications (μCalcs) in the vulnerability of plaque rupture.  In Vengrenyuk et al., (2006) it was first proposed that cap…

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March 2020

SEMINAR: Atomistic Transport Processes at Liquid-Vapor Interfaces

March 6 @ 11:00 am - 12:00 pm
EB3 2207, 911 Oval Drive
Raleigh, NC 27695

Abstract: Advanced condenser surfaces with micro- and nanoscale wettability patterns have attracted much attention recently due to their potential to significantly increase performance in water harvesting and thermal management applications. Performance in these systems is measured in terms of the condensation rate, which is dictated not only by vapor-to-liquid phase change processes but also by the transport of condensed liquid droplets along the condenser surface. Computational fluid dynamics modeling offers a pathway to design surface patterns that optimize condensation rates,…

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