Open Access. Powered by Scholars. Published by Universities.®

Mechanical Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 30 of 31

Full-Text Articles in Mechanical Engineering

Experiments And Models For The Thermal Response Of Railroad Tapered-Roller Bearings, Constantine M. Tarawneh, Kevin D. Cole, Brent M. Wilson, Fadi Alnaimat Dec 2008

Experiments And Models For The Thermal Response Of Railroad Tapered-Roller Bearings, Constantine M. Tarawneh, Kevin D. Cole, Brent M. Wilson, Fadi Alnaimat

Mechanical & Materials Engineering Faculty Publications

The need to understand and quantify the heat transfer paths within tapered-roller bearings is of great importance in the railroad industry since bearing cup temperature measurement is the primary tool utilized in the removal of distressed bearings from service. Experiments were performed to acquire temperature histories at several locations on a stationary bearing subjected to heat sources imbedded in two rollers. The experimental results were compared to zero- and first-order thermal models to estimate overall heat transfer coefficients from the bearing. The results presented here can be used to explain some of the mechanisms that lead to overheating of tapered-roller ...


Real-Time Vertical Track Deflection Measurement System, Sheng Lu Nov 2008

Real-Time Vertical Track Deflection Measurement System, Sheng Lu

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Track quality is a major factor in railroad safety, and one accepted indicator of track quality is the vertical track deflection. Measuring track deflection from a moving railcar is difficult because there is no stable reference for the measurements. A system developed by researchers at the University of Nebraska to measure track deflection from a moving railcar in real-time is described in detail. The system consists of a loaded hopper with a camera/laser sensor system to detect the vertical deflection of the rail relative to the wheel/rail contact point. Modeling and simulation of the system is also presented ...


Flush-Mounted Steady-Periodic Heated Film With Application To Shear-Stress Measurement, Kevin D. Cole Nov 2008

Flush-Mounted Steady-Periodic Heated Film With Application To Shear-Stress Measurement, Kevin D. Cole

Mechanical & Materials Engineering Faculty Publications

Surface-mounted heated films have been used for fluid-flow measurement for many years. Recently unsteady heating of such surface films has been explored experimentally. In this paper steady-periodic heating of a surface-mounted film is studied analytically. Wall effects and axial heat conduction in the fluid are included. The temperature is found as an exact integral expression constructed from separate Green’s function formulations in the fluid flow and in the solid wall that are matched at the fluid-solid interface. Results for temperature, obtained by quadrature, are reported for several flow speeds and several steady-periodic frequencies. The results show that steady-periodic heating ...


Contact-Resonance Atomic Force Microscopy For Viscoelasticity, P. A. Yuya, D. C. Hurley, Joseph A. Turner Oct 2008

Contact-Resonance Atomic Force Microscopy For Viscoelasticity, P. A. Yuya, D. C. Hurley, Joseph A. Turner

Faculty Publications from the Department of Engineering Mechanics

We present a quantitative method for determining the viscoelastic properties of materials with nanometer spatial resolution. The approach is based on the atomic force acoustic microscopy technique that involves the resonant frequencies of the atomic force microscopy cantilever when its tip is in contact with a sample surface. We derive expressions for the viscoelastic properties of the sample in terms of the cantilever frequency response and damping loss. We demonstrate the approach by obtaining experimental values for the storage and loss moduli of a poly(methyl methacrylate) film using a polystyrene sample as a reference material. Experimental techniques and system ...


Newsletters For The Larsen Tractor Museum, Tractor Museum Oct 2008

Newsletters For The Larsen Tractor Museum, Tractor Museum

Museum Planning and Development Documents

No abstract provided.


Impact Mechanics And High-Energy Absorbing Materials: Review, Pizhong Qiao, Mijia Yang, Florin Bobaru Oct 2008

Impact Mechanics And High-Energy Absorbing Materials: Review, Pizhong Qiao, Mijia Yang, Florin Bobaru

Faculty Publications from the Department of Engineering Mechanics

In this paper a review of impact mechanics and high-energy absorbing materials is presented. We review different theoretical models (rigid-body dynamics, elastic, shock, and plastic wave propagation, and nonclassical or nonlocal models. and computational methods (finite-element, finite-difference, and mesh-free methods. used in impact mechanics. Some recent developments in numerical simulation of impact (e.g., peridynamics) and new design concepts proposed as high energy absorbing materials (lattice and truss structures, hybrid sandwich composites, metal foams, magnetorheological fluids, porous shape memory alloys. are discussed. Recent studies on experimental evaluation and constitutive modeling of strain rate-dependent polymer matrix composites are also presented. Impact ...


Lester Larsen: Progress Of Tractor Test Work 1946 -1956, Tractor Museum Sep 2008

Lester Larsen: Progress Of Tractor Test Work 1946 -1956, Tractor Museum

Individuals Associated with the Nebraska Tractor Test

When Lester F. Larsen was hired as Engineer in Charge of the Nebraska Tractor Test, the laboratory had been inactive since 1941 due to World War II. Much of the test equipment was out of order and in need of repair. He kept a journal called the Progress of Tractor Test Work. This journal of day to day activities extended from 1946 through 1956.


Finite Element Analysis Using Nonconforming Mesh, Ashok V. Kumar, Ravi Buria, Sanjeev Padmanabhan, Linxia Gu Sep 2008

Finite Element Analysis Using Nonconforming Mesh, Ashok V. Kumar, Ravi Buria, Sanjeev Padmanabhan, Linxia Gu

Mechanical & Materials Engineering Faculty Publications

A method for finite element analysis using a regular or structured grid is described that eliminates the need for generating conforming mesh for the geometry. The geometry of the domain is represented using implicit equations, which can be generated from traditional solid models. Solution structures are constructed using implicit equations such that the essential boundary conditions are satisfied exactly. This approach is used to solve boundary value problems arising in thermal and structural analysis. Convergence analysis is performed for several numerical examples and the results are compared with analytical and finite element analysis solutions to show that the method gives ...


High-Impact, Energy-Absorbing Vehicle Barrier System : United States Patent 7,410,320 B2, Ronald K. Faller, Dean L. Sicking, John R. Rohde, John D. Reid, Robert W. Bielenberg, James C. Holloway, Karla A. Polivka Aug 2008

High-Impact, Energy-Absorbing Vehicle Barrier System : United States Patent 7,410,320 B2, Ronald K. Faller, Dean L. Sicking, John R. Rohde, John D. Reid, Robert W. Bielenberg, James C. Holloway, Karla A. Polivka

Mechanical & Materials Engineering Faculty Publications

A high-impact, energy-absorbing vehicle barrier system generally includes a substantially rigid outer containment wall coupled via strap assemblies with an energy-absorbing inner impact wall, and energy-absorbing cartridges strategically positioned between the impact wall and containment wall. The impact wall is constructed of a number of tubes coupled with one another to present a substantially smooth, unifonn surface to passing vehicles. The energy-absorbing cartridges generally consist of a foam member or a number of foam sheets which compress and crush between the containment wall and impact wall to absorb energy from an errant vehicle striking the face of the impact wall ...


Method And Apparatus For Noncontact Relative Rail Displacement, Track Modulus And Stiffness Measurement By A Moving Rail Vehicle: Us Patent No. Us 7,403,296 B2, Shane Farritor, Richard Arnold, Chris Norman Jul 2008

Method And Apparatus For Noncontact Relative Rail Displacement, Track Modulus And Stiffness Measurement By A Moving Rail Vehicle: Us Patent No. Us 7,403,296 B2, Shane Farritor, Richard Arnold, Chris Norman

Mechanical & Materials Engineering Faculty Publications

An on-board, noncontact measurement system and method is disclosed for measuring track quality, vertical track stiffness and vertical track modulus for a portion of track underlying the rail vehicle. The system comprises first and second optical emitters mounted to the vehicle and configured to emit beams of light that are detectable on the underlying surface; a camera mounted to the vehicle for recording the distance between the beams of light as the vehicle travels along the surface, a mechanism for measuring the distance between the beams of light for a particular portion of the surface; and a mechanism for determining ...


Test 006: Case 10-20, Tractor Museum May 2008

Test 006: Case 10-20, Tractor Museum

Case-New Holland

Test 006: Case 10-20

All tractors tested at the Nebraska Tractor Test Laboratory were certified by their manufacturers as being stock model machines, conforming to specifications filed with the application for test. No special or high-test fuels were used except as recommended by the manufacturer as necessary.

All results within the official tractor test report were actually attained in tests and are without correction or allowances for friction, temperature, altitude, etc. The results were initially accomplished with the tractor in charge of skilled operators employed by the University.

Unless otherwise noted, each tractor was apparently in good condition at the ...


Phase-Field Modeling Of The Formation Of Lamellar Nanostructures In Diblock Copolymer Thin Films Under Inplanar Electric Fields, Xiang-Fa Wu, Yuris A. Dzenis May 2008

Phase-Field Modeling Of The Formation Of Lamellar Nanostructures In Diblock Copolymer Thin Films Under Inplanar Electric Fields, Xiang-Fa Wu, Yuris A. Dzenis

Faculty Publications from the Department of Engineering Mechanics

Recent experiments show that external inplanar electric field can be employed to guide the molecular self-assembly in diblock copolymer (BCP) thin films to form lamellar nanostructures with potential applications in nanotechnology. We study this self-assembly process through a detailed coarse-grained phase separation modeling. During the process, the free energy of the BCP films is modeled as the Ginzburg-Landau free energy with nonlocal interaction and electrostatic coupling. The resulting Cahn-Hilliard (CH) equation is solved using an efficient semi-implicit Fourier-spectral algorithm. Numerical results show that the morphology of order parameter formed in either symmetric or asymmetric BCP thin films is strongly influenced ...


Test007: Case 20-30, Tractor Museum May 2008

Test007: Case 20-30, Tractor Museum

Case-New Holland

All tractors tested at the Nebraska Tractor Test Laboratory were certified by their manufacturers as being stock model machines, conforming to specifications filed with the application for test. No special or high-test fuels were used except as recommended by the manufacturer as necessary.

All results within the official tractor test report were actually attained in tests and are without correction or allowances for friction, temperature, altitude, etc. The results were initially accomplished with the tractor in charge of skilled operators employed by the University.

Unless otherwise noted, each tractor was apparently in good condition at the end of the testing ...


Tractor Inventory May 2008

Tractor Inventory

Nebraska Tractor Tests

No abstract provided.


Digital Media Agco Challenger, Tractor Museum May 2008

Digital Media Agco Challenger, Tractor Museum

Nebraska Tractor Tests

Images and videos of the 2008 Agco Challenger Tractor Testing.


Free-Edge Stresses And Progressive Cracking In Surface Coatings Of Circular Torsion Bars, Xiang-Fa Wu, Yuris A. Dzenis, Kyle W. Strabala Apr 2008

Free-Edge Stresses And Progressive Cracking In Surface Coatings Of Circular Torsion Bars, Xiang-Fa Wu, Yuris A. Dzenis, Kyle W. Strabala

Faculty Publications from the Department of Engineering Mechanics

This paper considers the explicit solutions of free-edge stresses near circumferential cracks in surface coatings of circular torsion bars and their application in determining the progressive cracking density in the coating layers. The problem was formulated within the framework of linear elastic fracture mechanics (LEFM). The free-edge stresses near crack tip and the shear stresses in the cross-section of the torsion bar were approached in explicit forms based on the variational principle of complementary strain energy. Criterion for progressive cracking in the coating layer was established in sense of strain energy conservation, and the crack density is thereby estimated. Effects ...


Subcritical And Supercritical Droplet Evaporation Within A Zero-Gravity Environment: Low Weber Number Relative Motion, Hongtao Zhang, Vasudevan Raghavan, George Gogos Apr 2008

Subcritical And Supercritical Droplet Evaporation Within A Zero-Gravity Environment: Low Weber Number Relative Motion, Hongtao Zhang, Vasudevan Raghavan, George Gogos

Mechanical & Materials Engineering Faculty Publications

A validated comprehensive axisymmetric numerical model, which includes the high pressure transient effects, variable thermo-physical properties and inert species solubility in the liquid phase, has been employed to study the evaporation of moving n-heptane droplets within a zero-gravity nitrogen environment, for a wide range of ambient pressures and initial freestream velocities. At the high ambient temperature considered (1000 K), the evaporation constant increases with the ambient pressure. At low ambient pressure, the evaporation constant becomes almost a constant during the end of the lifetime. At high ambient pressures, the transient behavior is present throughout the droplet lifetime. The final penetration ...


Experimental Characterization Of The Impact-Damage Tolerance Of A Cross-Ply Graphite-Fiber/Epoxy Laminate, Xiang-Fa Wu, Goutam Ghoushal, Mikhail Kartashov, Zuleyha Aslan, Joseph A. Turner, Yuris A. Dzenis Mar 2008

Experimental Characterization Of The Impact-Damage Tolerance Of A Cross-Ply Graphite-Fiber/Epoxy Laminate, Xiang-Fa Wu, Goutam Ghoushal, Mikhail Kartashov, Zuleyha Aslan, Joseph A. Turner, Yuris A. Dzenis

Xiang-Fa Wu Publications

In this study, the impact-damage tolerance of a graphite-fiber/epoxy composite laminate is studied by examining the correlation between the impact force and the resulting delamination area in the laminate. The cross-ply [02/902/02]s composite laminate was made of thermosetting P7051S-20Q-1000 prepregs (Toray Composites America). A Hopkinson pressure bar (HPB) was employed to create the impulsive loading with varying magnitude. Transient impact force, displacement, impact power, and transmitted impact energy were calculated using the transient signals recorded from the strain gage mounted on the HPB. Impulsive loads with controllable magnitude were used to induce delamination ...


Surgical Camera Robot: United States Patent No. Us 7,339,341 B2, Dmitry Oleynikov, Shane Farritor, Mark E. Rentschler, Stephen R. Platt, Jason Dumpert Mar 2008

Surgical Camera Robot: United States Patent No. Us 7,339,341 B2, Dmitry Oleynikov, Shane Farritor, Mark E. Rentschler, Stephen R. Platt, Jason Dumpert

Mechanical & Materials Engineering Faculty Publications

The present invention is a miniature camera robot which can be placed entirely within an open space such as an abdominal cavity. The instant camera robot has pan and tilt capabilities, an adjustable focus camera, and a support component for supporting the robot body. In particular embodiments, the camera robot further contains a light source for illumination and a handle to position the camera robot. A system and method for using the instant camera robot are also provided.


Influence Of Spatial Correlation Function On Attenuation Of Ultrasonic Waves In Two-Phase Materials, Dalie Liu, Joseph A. Turner Feb 2008

Influence Of Spatial Correlation Function On Attenuation Of Ultrasonic Waves In Two-Phase Materials, Dalie Liu, Joseph A. Turner

Faculty Publications from the Department of Engineering Mechanics

Successful processing of materials by powder sintering relies on the creation of strong interparticle bonds. During certain critical stages of the sintering process, the medium may be modeled as two phases consisting of the particles and a surrounding matrix. Ultrasonic methods have been proposed as a potential tool for monitoring such sintering processes. Thus, an understanding of the propagation and scattering of elastic waves in two-phase solids is of fundamental importance to these monitoring techniques. In this article, expressions for the ultrasonic attenuations are developed based on the spatial statistics of the density and Lamé parameters of the material constituents ...


Tractor Museum Podcast: Father Of Test Law Explains It, Tractor Museum Jan 2008

Tractor Museum Podcast: Father Of Test Law Explains It, Tractor Museum

Nebraska Tractor Tests

Nebraska State Representative Wilmot F. Crozier of Osceola, Nebraska, who fathered and pushed the tractor bill through the Nebraska State Legislature. On September 19th, 1919, he tells why he formulated the law and his story to Implement & Trade Journal.


Digital Media John Deere, Tractor Museum Jan 2008

Digital Media John Deere, Tractor Museum

Nebraska Tractor Tests

Images, videos and audios of 2008 John Deere Tractor Testing. Taken during March and April of 2008.


On Constitutive Models For Limited Elastic, Molecular Based Materials, Millard F. Beatty Jan 2008

On Constitutive Models For Limited Elastic, Molecular Based Materials, Millard F. Beatty

Faculty Publications from the Department of Engineering Mechanics

The response function for a general class of elastic molecular based materials characterized by their limiting molecular chain extensibility and depending on only the first principal invariant of the Cauchy–Green deformation tensor together with a certain molecular based limiting extensibility parameter is introduced. The constitutive response function for the Gent material is then derived inversely as the [0/1] Padé approximant of this class, a result that leads naturally to an infinite geometric series representation of its response function. Truncation of this series function characterizes a familiar class of quadratic materials now having physically relevant material constants. It is ...


Rippling Of Polymer Nanofibers, Xiang-Fa Wu, Yulia Kostogorova-Beller, Alexander Goponenko, Haoqing Hou, Yuris A. Dzenis Jan 2008

Rippling Of Polymer Nanofibers, Xiang-Fa Wu, Yulia Kostogorova-Beller, Alexander Goponenko, Haoqing Hou, Yuris A. Dzenis

Faculty Publications from the Department of Engineering Mechanics

This paper studies the evolution mechanism of surface rippling in polymer nanofibers under axial stretching. This rippling phenomenon has been detected in as-electrospun polyacrylonitrile in recent single-fiber tension tests, and in electrospun polyimide nanofibers after imidization. We herein propose a one-dimensional nonlinear elastic model that takes into account the combined effect of surface tension and nonlinear elasticity during the rippling initiation and its evolution in compliant polymer nanofibers. The polymer nanofiber is modeled as an incompressible, isotropically hyperelastic Mooney-Rivlin solid. The fiber geometry prior to rippling is considered as a long circular cylinder. The governing equation of surface rippling is ...


Analysis Of The Effects Of The Residual Charge And Gap Size On Electrospun Nanofiber Alignment In A Gap Method, Lihua Liu, Yuris A. Dzenis Jan 2008

Analysis Of The Effects Of The Residual Charge And Gap Size On Electrospun Nanofiber Alignment In A Gap Method, Lihua Liu, Yuris A. Dzenis

Faculty Publications from the Department of Engineering Mechanics

In this paper, the effects of residual charges on nanofiber alignment in a gap method are studied and presented. The gap method was presented by Li and Xia (2003 Nano Lett. 3 1167); in it, a gap is introduced into a traditional collector. Due to the non-perfect conductivity of electrospun nanofibers, they carry residual charges after deposition across the gap. These residual charges will interact with the charges carried by the upcoming jet/fiber, that will also deposit across the gap. The effects of these charge interactions on nanofiber alignment were studied numerically at various gap sizes. Results showed that ...


Simultaneous Birefringence, Small- And Wide-Angle X-Ray Scattering To Detect Precursors And Characterize Morphology Development During Flow-Induced Crystallization Of Polymers, Lucia Fernandez-Ballester, Tim Gough, Florian Meneau, Wim Bras, Fernando Ania, Francisco Jose Balta-Calleja, Julia A. Kornfield Jan 2008

Simultaneous Birefringence, Small- And Wide-Angle X-Ray Scattering To Detect Precursors And Characterize Morphology Development During Flow-Induced Crystallization Of Polymers, Lucia Fernandez-Ballester, Tim Gough, Florian Meneau, Wim Bras, Fernando Ania, Francisco Jose Balta-Calleja, Julia A. Kornfield

Faculty Publications from the Department of Engineering Mechanics

An experimental configuration that combines the powerful capabilities of a short-term shearing apparatus with simultaneous optical and X-ray scattering techniques is demonstrated, connecting the earliest events that occur during shear-induced crystallization of a polymer melt with the subsequent kinetics and morphology development. Oriented precursors are at the heart of the great effects that flow can produce on polymer crystallization (strongly enhanced kinetics and formation of highly oriented crystallites), and their creation is highly dependent on material properties and the level of stress applied. The sensitivity of rheo-optics enables the detection of these dilute shear-induced precursors as they form during flow ...


Computer Simulation Of Radio Frequency Heating Of Model Fruit Immersed In Water, Sohan Birla, Shaojin Wang, Juming Tang Jan 2008

Computer Simulation Of Radio Frequency Heating Of Model Fruit Immersed In Water, Sohan Birla, Shaojin Wang, Juming Tang

Faculty Publications from the Department of Engineering Mechanics

The present study investigated the effect of different factors on temperature distribution within a spherical object in a parallel plate radio frequency (RF) heating system. A finite element-computer simulation program - FEMLAB was used to solve the electromagnetic and Navier-Stoke equations for developing a model to study the effect of dielectric properties of a model fruit and its surrounding medium. The model fruit was prepared from 1% gellan gel for experimental validation of the simulation results. The results showed that spherically-shaped samples surrounded with air between RF electrodes and placed in the proximity of electrodes would not heat uniformly. Immersing the ...


Numerical Simulation Of A Novel Blast Wave Mitigation Device, Zhenbi Su, Wen Peng, Zhaoyan Zhang, George Gogos, Reed Skaggs, Bryan Cheeseman Jan 2008

Numerical Simulation Of A Novel Blast Wave Mitigation Device, Zhenbi Su, Wen Peng, Zhaoyan Zhang, George Gogos, Reed Skaggs, Bryan Cheeseman

Mechanical & Materials Engineering Faculty Publications

This paper proposes a novel blast wave mitigation device, consisting of a piston–cylinder assembly. A shock wave is induced inside the device when it is subject to a blast wave. The shock wave propagates inside the device and is reflected repeatedly. The physical processes within the blast wave mitigation device are simulated numerically. Numerical predictions are in excellent agreement with analytical solutions for special cases of the investigated problem that are available in the literature. The peak pressure on the base of the device caused by the blast wave is studied using a number of design parameters. The numerical ...


Fabrication Of High Aspect Ratio Metal Nanotips By Nanosecond Pulse Laser Melting, Bo Cui, Lin Wu, Stephen Y. Chou Jan 2008

Fabrication Of High Aspect Ratio Metal Nanotips By Nanosecond Pulse Laser Melting, Bo Cui, Lin Wu, Stephen Y. Chou

Mechanical & Materials Engineering Faculty Publications

The authors have developed an approach to fabricate sharp and high aspect ratio metal tips using nanosecond pulse laser melting. A quartz wafer covered with a thin chromium (Cr) film was placed on top of a second wafer with a sub-micrometer gap between them and the Cr film facing the second wafer. Then an excimer laser pulse (308 nm wavelength, 20 ns pulse duration) was shone from the back of the quartz wafer and melted the Cr film momentarily (several hundred nanoseconds). It is found that the molten Cr films can self-form discrete metal pillars connecting the two wafers. After ...


Conduction In Rectangular Plates With Boundary Temperatures Specified, James V. Beck, Neil T. Wright, A. Haji-Sheikh, Kevin D. Cole, Donald E. Amos Jan 2008

Conduction In Rectangular Plates With Boundary Temperatures Specified, James V. Beck, Neil T. Wright, A. Haji-Sheikh, Kevin D. Cole, Donald E. Amos

Mechanical & Materials Engineering Faculty Publications

Steady-state components of heat conduction solutions may have very slowly convergent series for temperatures and non-convergent heat fluxes for temperature boundary conditions. Previous papers have proposed methods to remove these convergence problems. However, even more effective procedures based on insights of Morse and Feshbach are given herein. In some cases it is possible to replace poorly-convergent or non-convergent series by closed-form algebraic solutions. Examples are given.