Ultrasonic Methods For The Characterization Of Complex Materials And Material Systems: Polymers, Structured Polymers, Soft Tissue And Bone,
2011
University of Nebraska-Lincoln
Ultrasonic Methods For The Characterization Of Complex Materials And Material Systems: Polymers, Structured Polymers, Soft Tissue And Bone, Charles Landais
Department of Engineering Mechanics: Dissertations, Theses, and Student Research
Understanding the characteristics and structure of materials is of importance in proper modeling and effective design of many products. Complex materials such as polymers, structured material systems, or biological materials provide a particular challenge to many of the traditional methods for doing this. In this dissertation I study the use of ultrasonic wave techniques to characterize several complex materials. These include plastically deformed and aged polycarbonate (PC), a structured PC plate with water filled cavities, bovine bone, and an elastomer used as a skin simulant. In each case, this work was part of a larger project that studied different aspects …
Modeling And Finite Element Analysis Methods For The Dynamic Crushing Of Honeycomb Cellular Meso-Structures,
2011
Clemson University
Modeling And Finite Element Analysis Methods For The Dynamic Crushing Of Honeycomb Cellular Meso-Structures, Jesse Schultz
All Theses
The effective static mechanical properties, such as the moduli of elasticity and rigidity and Poisson's ratio, of honeycomb cellular meso-structures are capable of control due to variations of their cellular geometry. While the dynamic properties of these structures are a popular topic of research, there is a lack of both consistent modeling methods and generalizations in terms of honeycomb cellular geometry. In order to fill these gaps, this study presents a standard set of methods for the finite element analysis (FEA) of honeycomb cellular materials subject to dynamic loading conditions, as well as illustrates the effects of the cellular geometry …
Airplane Landing Flare-The Last 5 Seconds,
2011
Minnesota State University, Mankato
Airplane Landing Flare-The Last 5 Seconds, Nihad E. Daidzic
Aviation Department Publications
No abstract provided.
Lower Extremity Biomechanics During Weightlifting Exercise Vary Across Joint And Load,
2011
University of Michigan
Lower Extremity Biomechanics During Weightlifting Exercise Vary Across Joint And Load, Kristof Kipp, Chad Harris, Michelle B. Sabick
Mechanical and Biomedical Engineering Faculty Publications and Presentations
The purpose of this study was to determine the effect of load on lower extremity biomechanics during the pull-phase of the clean. Kinematic and kinetic data of the three joints of the lower extremity were collected while participants performed multiple sets of cleans at three percentages: 65, 75, and 85% of 1-Reptition maximum (RM). General linear models with repeated measures were used to assess the influence of load on angular velocities, net torques, powers, and rates of torque development at the ankle, knee, and hip joint. The results suggest that the biomechanical demands required from the lower extremities change with …
Joule Heating Effects On Electrokinetic Transport In Constriction Microchannels,
2011
Clemson University
Joule Heating Effects On Electrokinetic Transport In Constriction Microchannels, Sriram Sridharan
All Theses
Microfluidic technology involving multidisciplinary studies including MEMS, chemistry, physics, fluids and heat transfer has been developed into a promising research field in the recent decade. If offers many advantages over conventional laboratory techniques like reduced reagent consumption, faster analysis, easy fabrication and low chemical waste. Microfluidic lab-on-a-chip devices have been used to manipulate cells and particles like sorting, separating, trapping, mixing and lysing. Microfluidic manipulation can be achieved through many methods and insulator based dielectrophoresis (iDEP) is one of the highly used method in the recent years. In iDEP, both DC and AC voltages can be applied to the remote …
Simulation And Validation Of Two-Component Flow In A Void Recirculation System,
2011
California Polytechnic State University, San Luis Obispo
Simulation And Validation Of Two-Component Flow In A Void Recirculation System, Oscar Eduardo Daza
Master's Theses
Nuclear power plants rely on the Emergency Core Cooling System (ECCS) to cool down the reactor core in case of an accident. Occasionally, air is entrained into the suction piping of ECCS causing voids that decrease pumping efficiency, and consequently damage the pumps. In an attempt to minimize the amount of voids entering the suction side of the pump in ECCS, a Void Recirculation System (VRS) experiment was conducted for a proof of concept purpose. While many studies have been oriented in studying two-component flow behavior in ECCS, none of them propose a solution to minimize air entrainment. As a …
Characterization Of Fracture Toughness G (Sub C) Of Pvc And Pes Foams,
2011
Florida Atlantic University
Characterization Of Fracture Toughness G (Sub C) Of Pvc And Pes Foams, Elio E. Saenz, Leif A. Carlsson, Anette M. Karlsson
Mechanical Engineering Faculty Publications
The fracture behavior of polyvinyl chloride (PVC) and polyethersulfone (PES) foams has been examined using the single-edge notch bend and the double cantilever beam (DCB) tests. PVC foam densities ranging from 45 to 100 kg/m3 and PES foam densities ranging from 60 to 130 kg/m3 were examined. The PVC foams failed in a linear elastic brittle manner, whereas the PES foams displayed much more ductility and substantially larger toughness at a comparable foam density. The cell wall thickness of the PES foams was almost twice the thickness of the PVC foams which may have contributed to the high …
Mechanical Properties Of Pecvd Boron Carbide,
2011
University of Nebraska-Lincoln
Mechanical Properties Of Pecvd Boron Carbide, Dhairyashil Aher
Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research
To the best of our knowledge, the mechanical properties of PECVD boron carbide (BC) grown using ortho-carborane as a source molecule have never been investigated before. Therefore, this thesis is an attempt to apply the bulge test and the nanoindentation technique for the mechanical characterization of PECVD BC thin films. Mechanical properties such as the Young’s modulus, hardness and residual stress were investigated. The bulge test system using an interferometry technique to measure the deflection of membrane has been designed. Commercially available LPCVD SiNx membrane windows were used as a substrate to deposit BC films for the bulge test. …
Theoretical Approach For Error Estimation Of Temperature And Thermal Conductivity In Uranium Dioxide Fuel,
2011
Utah State University
Theoretical Approach For Error Estimation Of Temperature And Thermal Conductivity In Uranium Dioxide Fuel, Adam John Gerth
All Graduate Plan B and other Reports, Spring 1920 to Spring 2023
The knowledge of in-reactor thermophysical properties of nuclear fuel rods, which are usually composed of uranium dioxide (UO2) ceramics, is important for the safe design and operation of nuclear power plants. A two thermocouple method can be utilized to determine the thermal conductivity within the fuel rods by measuring rod centerline temperature and cladding temperature. Using this technique, Halden Reactor Project (HRP) has developed a correlation for thermal conductivity of UO2 as a function of temperature and burnup. This correlation for thermal conductivity was extracted from experimental data based on a constant thermal conductivity assumption of the fuel rod. However, …
Connective Complexity Methods For Analysis And Prediction In Engineering Design,
2011
Clemson University
Connective Complexity Methods For Analysis And Prediction In Engineering Design, James Mathieson
All Theses
Complexity is an aspect of engineering design that is often addressed directly with the principle that 'designs should be simple'. However, such a principle fails to offer an effective means of quantifying the complexity of a given design for comparison and decision making. The measurement of complexity within a specific representations and domains has been well established. However, such measurements are inherently limited in their applicability and not always clear in their implications. This research presents a method of measuring complexity from different engineering representations in a consistent manner and explores the application of these measures.
The development of a …
Fluid Dynamics Of Cell Printing,
2011
Clemson University
Fluid Dynamics Of Cell Printing, Ping He
All Dissertations
Cell printing is an emerging technology that uses droplets to deliver cells to desired positions with resolution potentially comparable to the size of single cells. In particular, ink–jet based cell printing technique has been successfully used to build simple bio–constructs and has shown a promise in building complex bio–structures or even organs. Two important issues in ink–jet based cell printing are the moderate survival rate of delicate cells and the limited cell placement resolution. Resolving these issues is critical for the ink–jet based cell printing techniques to realize their full potential.
In this work, we use numerical simulations to reconstruct …
An Experimental And Numerical Study Of Secondary Flows And Film Cooling Effectiveness In A Transonic Cascade,
2011
University of Central Florida
An Experimental And Numerical Study Of Secondary Flows And Film Cooling Effectiveness In A Transonic Cascade, James C. Kullberg
HIM 1990-2015
Experimental tests on a transonic annular rig are time-consuming and expensive, so it is desirable to use experimental results to validate a computational model which can then be used to extract much more information. The purpose of this work is to create a numerical model that can be used to simulate many different scenarios and then to apply these results to experimental data.; In the modern world, gas turbines are widely used in aircraft propulsion and electricity generation. These applications represent a massive use of energy worldwide, so even a very small increase in efficiency would have a significant beneficial …
Gimbaled Permanent Magnet-Based Attitude Control For Pico/Nano-Satellites,
2011
University of Arkansas, Fayetteville
Gimbaled Permanent Magnet-Based Attitude Control For Pico/Nano-Satellites, Rex Bair
Mechanical Engineering Undergraduate Honors Theses
As man-made satellites grow continually smaller and smaller, new, lower mass, volume, and power solutions must be devised to give these satellites the same performance capabilities as larger satellites. One subsystem that is especially difficult to shrink is the Attitude Determination and Control System (ADACS), which is used to position the satellite in a given orientation with respect to a specific reference frame. This paper explores a novel mechanism which combines both of these functions into one device. A permanent magnet is used in conjunction with the geomagnetic reference frame to provide magnetic torque to change the spacecraft's attitude. By …
Design And Calibration Of A Wind Tunnel Facility For The Study Of Active Flow Control On Wind Turbine Blades,
2011
Syracuse University
Design And Calibration Of A Wind Tunnel Facility For The Study Of Active Flow Control On Wind Turbine Blades, Christopher Paul Walter
Renée Crown University Honors Thesis Projects - All
Our group at Syracuse University has been working under Professor Mark Glauser as part of a wind consortium with the University of Minnesota and United Technologies Research Group. Our component of this project will be to develop a system which can be imbedded in an airfoil which can increase the efficiency of the airfoil. Along with developing this “intelligent blade,” we will also be characterizing the affect our control system will have on aerodynamic noise. To accomplish these goals, Syracuse University’s anechoic jet facility was remodeled to incorporate a wind tunnel within which we could run our experiments. Upon the …
Carbon Nanotube Based Ion Sensitive Field Effect Transistor,
2011
University of Arkansas, Fayetteville
Carbon Nanotube Based Ion Sensitive Field Effect Transistor, Matthew Margis
Mechanical Engineering Undergraduate Honors Theses
Carbon nanotubes (CNTs) have been the subject of much research in the past two decades. Due to their extraordinary mechanical and electrical properties, CNTs are ideal candidates for various sensors and electronic device applications. The purpose of this research is to overcome the difficulties in separating and aligning CNTs so that they can be implemented in an ion sensitive field effect transistor (ISFET). A solution to the alignment process has been presented that involves cutting nano channels on a microelectrode chip with an Atomic Force Microscope (AFM) in order to nanomanipulate the CNTs into the nano channels. Upon successfully cutting …
Tribological Behavior Of Lubricants With And Without Nanoadditives: A Compartive Study,
2011
University of Arkansas, Fayetteville
Tribological Behavior Of Lubricants With And Without Nanoadditives: A Compartive Study, Kevin Carlson
Mechanical Engineering Undergraduate Honors Theses
Nano particle based additives have become a main focal point in the design of new lubricants, in order to better achieve reduction in both friction and wear. Previous research has led to the development of one such lubricant known as NanoGlide® by a company called NanoMech, Inc. The success of this initial lubricant design encouraged the research and potential development of new formulations of nano particle based lubricants by NanoMech, Inc. Using tribological testing, and Scanning Electron Microscopy (SEM), this research analyzed the behavior and performance of three new nano additives (NanoGlide 1, NanoGlide2, and NanoGlide3) in three different lubricant …
Spectral Characterization Of Venusian Surface Mineralogy,
2011
University of Arkansas, Fayetteville
Spectral Characterization Of Venusian Surface Mineralogy, Johnathon Conley
Mechanical Engineering Undergraduate Honors Theses
While the atmospheric chemical composition of the Venusian atmosphere has been characterized at length by probes and ground-based equipment, the surface mineralogy of Venus is not yet well understood. The extremely thick atmosphere of Venus shields the surface from direct observation. While radar imaging of the surface reveals surface morphology, surface composition is difficult to characterize at a distance. Observation is also difficult due to the intense temperature (approximately 480°C) and pressure (approximately 90 atm) found on the surface. This has prompted NASA and other institutions around the world to begin planning for new missions to land on the surface …
The Effect Of Axial Conduction On Heat Transfer In A Liquid Microchannel Flow,
2011
University of Nebraska-Lincoln
The Effect Of Axial Conduction On Heat Transfer In A Liquid Microchannel Flow, Kevin D. Cole, Barbaros Çetin
Department of Mechanical and Materials Engineering: Faculty Publications
Analysis is presented for conjugate heat transfer in a parallel-plate microchannel. Axial conduction in the fluid and in the adjacent wall are included. The fluid is a constant property liquid with a fully-developed velocity distribution. The microchannel is heated by a uniform heat flux applied to the outside of the channel wall. The analytic solution is given in the form of integrals by the method of Green’s functions. Quadrature is used to obtain numerical results for the local and average Nusselt number for various flow velocities, heating lengths, wall thicknesses, and wall conductivities. These results have application in the optimal …
The Design, Development, And Optimization Of Variable And Fixed Orifice Dampers With Empirical And Experimental Testing For Implementation In The Railroad Industry,
2011
University of Texas-Pan American
The Design, Development, And Optimization Of Variable And Fixed Orifice Dampers With Empirical And Experimental Testing For Implementation In The Railroad Industry, Charles K. Speck
Theses and Dissertations - UTB/UTPA
The work of this thesis details the experimental testing, development, and optimization of the spools and system of the variable orifice damper system. The fixed orifice system was developed from concept, tested, and then redesigned. The experimental testing for the orifice selection directed the optimization and final design for the fixed orifice damper system. The testing focused on the evaluation of pressure drops and flow rate for static testing. The dynamic testing evaluated the displacement rate and force loading. Design, testing, and optimization worked to achieve designed flow rates and pressure drops provided by Amsted Rail based upon simulations. When …
Energy Efficiency's Role In A Zero Energy Building: Simulating Energy Efficient Upgrades In A Residential Test Home To Reduce Energy Consumption,
2011
University of Tennessee at Chattanooga
Energy Efficiency's Role In A Zero Energy Building: Simulating Energy Efficient Upgrades In A Residential Test Home To Reduce Energy Consumption, Andrew Griffin Frye
Masters Theses and Doctoral Dissertations
With the steady rise in power consumption, automobile usage, and industrial production worldwide for the past century, countries have realized that meeting these ever-growing energy demands could potentially devastate the environment. In the United States, generating electrical power constitutes the largest source of carbon dioxide emissions and the majority of this power is used to electrify buildings both in the commercial and residential sectors. It is estimated that 21% of all electrical power generated in the United States is consumed by residential buildings. To reduce the total amount of electricity that need be generated (and therefore, the amount of pollution) …
