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W. Gregory Sawyer
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Proceedings Papers

Non-Newtonian Lubrication With the Second Order Fluid

W. Gregory Sawyer, John A. Tichy
Proc. ASME. IMECE97, Rheology and Fluid Mechanics of Nonlinear Materials, 7-13, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0468
https://doi.org/10.1115/IMECE1997-0468
View Paper titled, Non-Newtonian Lubrication With the Second Order Fluid
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Topics: Fluids, Lubrication, Lubricants, Boundary-value problems, Pressure, Tensors, Viscoelasticity
Journal Articles

Superlubricity in Gemini Hydrogels

Angela A. Pitenis, Juan Manuel Urueña, Andrew C. Cooper, Thomas E. Angelini, W. Gregory Sawyer
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. October 2016, 138(4): 042103.
Paper No: TRIB-15-1294
https://doi.org/10.1115/1.4032890
Published Online: July 26, 2016
View Article titled, Superlubricity in Gemini Hydrogels
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Topics: Friction, Hydrogels, Tribology
Journal Articles

Lubricity from Entangled Polymer Networks on Hydrogels

Angela A. Pitenis, Juan Manuel Urueña, Ryan M. Nixon, Tapomoy Bhattacharjee, Brandon A. Krick, Alison C. Dunn, Thomas E. Angelini, W. Gregory Sawyer
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. October 2016, 138(4): 042102.
Paper No: TRIB-15-1253
https://doi.org/10.1115/1.4032889
Published Online: July 26, 2016
View Article titled, Lubricity from Entangled Polymer Networks on Hydrogels
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Topics: Friction, Hydrogels, Polymers, Polymerization
Proceedings Papers

Mechanical Characterization of Contact Lenses by Microindentation: Constant Velocity and Relaxation Testing

Sung Jin Lee, Gerald R. Bourne, Xiaoming Chen, W. Gregory Sawyer, Malisa Sarntinoranont
Proc. ASME. SBC2008, ASME 2008 Summer Bioengineering Conference, Parts A and B, 387-388, June 25–29, 2008
Publisher: American Society of Mechanical Engineers
Paper No: SBC2008-192640
https://doi.org/10.1115/SBC2008-192640
View Paper titled, Mechanical Characterization of Contact Lenses by Microindentation: Constant Velocity and Relaxation Testing
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Topics: Relaxation (Physics), Testing, Fluids, Hydrogels, Materials properties, Design, Electrical conductance, Finite element analysis, Fittings, Lenses (Optics)
Proceedings Papers

Microindentation Testing of Rat Brain Tissue Slices

James S. Wu, Alison C. Dunn, Sung J. Lee, W. Gregory Sawyer, Malisa Sarntinoranont
Proc. ASME. SBC2007, ASME 2007 Summer Bioengineering Conference, 897-898, June 20–24, 2007
Publisher: American Society of Mechanical Engineers
Paper No: SBC2007-176235
https://doi.org/10.1115/SBC2007-176235
View Paper titled, Microindentation Testing of Rat Brain Tissue Slices
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Topics: Biological tissues, Brain, Testing, Mechanical properties, Nondestructive evaluation
Proceedings Papers

Evaluation of Contact Force and Elastic Foundation Models for Wear Analysis of Multibody Systems

Saad M. Mukras, Nam Ho Kim, Tony L. Schmitz, W. Gregory Sawyer
Proc. ASME. IDETC-CIE2010, Volume 2: 34th Annual Mechanisms and Robotics Conference, Parts A and B, 1565-1577, August 15–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: DETC2010-28750
https://doi.org/10.1115/DETC2010-28750
View Paper titled, Evaluation of Contact Force and Elastic Foundation Models for Wear Analysis of Multibody Systems
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Topics: Multibody systems, Wear, Finite element methods, Clearances (Engineering), Damping, Dynamic analysis, Pressure, Dynamics (Mechanics), Shapes, Waste-to-energy
Journal Articles

Comparison Between Elastic Foundation and Contact Force Models in Wear Analysis of Planar Multibody System

Saad Mukras, Nam H. Kim, Nathan A. Mauntler, Tony Schmitz, W. Gregory Sawyer
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. July 2010, 132(3): 031604.
https://doi.org/10.1115/1.4001786
Published Online: July 21, 2010
View Article titled, Comparison Between Elastic Foundation and Contact Force Models in Wear Analysis of Planar Multibody System
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Topics: Multibody systems, Waste-to-energy, Wear, Bushings, Clearances (Engineering)
Proceedings Papers

Dynamic Modeling of a Slider-Crank Mechanism Under Joint Wear

Saad Mukras, Nate Mauntler, Nam Ho Kim, Tony Schmitz, W. Gregory Sawyer
Proc. ASME. IDETC-CIE2008, Volume 2: 32nd Mechanisms and Robotics Conference, Parts A and B, 443-452, August 3–6, 2008
Publisher: American Society of Mechanical Engineers
Paper No: DETC2008-49244
https://doi.org/10.1115/DETC2008-49244
View Paper titled, Dynamic Modeling of a Slider-Crank Mechanism Under Joint Wear
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Topics: Dynamic modeling, Wear, Kinematics, Dynamic models, Instrumentation, Modeling
Proceedings Papers

Environmental Performance Limits of Ultrananocrystalline Diamond Films

Matthew A. Hamilton, Andrew R. Konicek, David S. Grierson, A. V. Sumant, Orlando Auciello, W. Gregory Sawyer, Robert W. Carpick
Proc. ASME. IJTC2008, STLE/ASME 2008 International Joint Tribology Conference, 9-10, October 20–22, 2008
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2008-71198
https://doi.org/10.1115/IJTC2008-71198
View Paper titled, Environmental Performance Limits of Ultrananocrystalline Diamond Films
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Topics: Diamond films, Diamonds, Friction, Carbon, Grain size, Mechanical properties, Nitrogen, Rendering, Temperature, Tribology
Journal Articles

Material Property Identification and Sensitivity Analysis Using Micro-Indentation

Long Ge, Nam H. Kim, Gerald R. Bourne, W. Gregory Sawyer
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. July 2009, 131(3): 031402.
https://doi.org/10.1115/1.3142902
Published Online: June 1, 2009
View Article titled, Material Property Identification and Sensitivity Analysis Using Micro-Indentation
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Topics: Materials properties, Sensitivity analysis, Geometry, Simulation, Optimization, Response surface methodology
Journal Articles

Temperature and Water Vapor Pressure Effects on the Friction Coefficient of Hydrogenated Diamondlike Carbon Films

Pamela L. Dickrell, N. Argibay, Osman L. Eryilmaz, Ali Erdemir, W. Gregory Sawyer
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. July 2009, 131(3): 032102.
https://doi.org/10.1115/1.3139047
Published Online: May 27, 2009
View Article titled, Temperature and Water Vapor Pressure Effects on the Friction Coefficient of Hydrogenated Diamondlike Carbon Films
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Topics: Friction, Pressure, Temperature, Water vapor, Carbon films, Desorption
Proceedings Papers

Tribological Investigation of a Low Friction, Low Wear Polymer/Polymer Composite

David L. Burris, W. Gregory Sawyer
Proc. ASME. WTC2005, World Tribology Congress III, Volume 2, 921-922, September 12–16, 2005
Publisher: American Society of Mechanical Engineers
Paper No: WTC2005-63524
https://doi.org/10.1115/WTC2005-63524
View Paper titled, Tribological Investigation of a Low Friction, Low Wear Polymer/Polymer Composite
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Topics: Friction, Polymer composites, Polymers, Tribology, Wear, Composite materials, Fillers (Materials), Lubricants, Nanoparticles, Particulate matter
Proceedings Papers

Nano-Tribology of a Polytetrafluoroethylene Transfer Films Using Molecular Dynamics Simulation and Microtribometry

Inkook Jang, Pamela L. Dickrell, David L. Burris, W. Gregory Sawyer, Simon R. Phillpot, Susan B. Sinnott
Proc. ASME. WTC2005, World Tribology Congress III, Volume 2, 933-934, September 12–16, 2005
Publisher: American Society of Mechanical Engineers
Paper No: WTC2005-63881
https://doi.org/10.1115/WTC2005-63881
View Paper titled, Nano-Tribology of a Polytetrafluoroethylene Transfer Films Using Molecular Dynamics Simulation and Microtribometry
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Topics: Chain, Engineering simulation, Lubricants, Molecular dynamics, Molecular dynamics simulation, Nanotribology, Polymer nanocomposites, Polymers, Simulation, Tribology
Proceedings Papers

Material Property Identification and Sensitivity Analysis Using Indentation and FEM

Long Ge, Nam Ho Kim, Gerald R. Bourne, W. Gregory Sawyer
Proc. ASME. IDETC-CIE2006, Volume 1: 32nd Design Automation Conference, Parts A and B, 481-489, September 10–13, 2006
Publisher: American Society of Mechanical Engineers
Paper No: DETC2006-99329
https://doi.org/10.1115/DETC2006-99329
View Paper titled, Material Property Identification and Sensitivity Analysis Using Indentation and FEM
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Topics: Finite element methods, Finite element model, Materials properties, Sensitivity analysis, Mechanical properties, Bulk solids, Coatings, Finite element analysis, Geometry, Manufacturing
Proceedings Papers

The Pigskin Professor: Video Presentations of Engineering Fundamentals

Tony L. Schmitz, W. Gregory Sawyer, Arturo Sinclair
Proc. ASME. IMECE2004, Innovations in Engineering Education: Mechanical Engineering Education, Mechanical Engineering/Mechanical Engineering Technology Department Heads, 53-57, November 13–19, 2004
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2004-60539
https://doi.org/10.1115/IMECE2004-60539
View Paper titled, The Pigskin Professor: Video Presentations of Engineering Fundamentals
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Topics: Engineering fundamentals, Engineering teachers, Aerospace engineering, Collaboration, Engineering education, Fans
Proceedings Papers

Metallic Glass Surface Patterning by Micro-Molding

Jeffrey Bardt, Nathan Mauntler, Gerald Bourne, Tony L. Schmitz, John C. Ziegert, W. Gregory Sawyer
Proc. ASME. IMECE2005, Manufacturing Engineering and Materials Handling, Parts A and B, 1123-1129, November 5–11, 2005
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2005-81099
https://doi.org/10.1115/IMECE2005-81099
View Paper titled, Metallic Glass Surface Patterning by Micro-Molding
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Topics: Metallic glasses, Molding, Crystallization, Geometry, Glass transition, Metals, Reactive-ion etching, Semiconductor wafers, Temperature
Journal Articles

Predicting Knee Replacement Damage in a Simulator Machine Using a Computational Model With a Consistent Wear Factor

Dong Zhao, Hideyuki Sakoda, W. Gregory Sawyer, Scott A. Banks, Benjamin J. Fregly
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Research Papers
J Biomech Eng. February 2008, 130(1): 011004.
https://doi.org/10.1115/1.2838030
Published Online: February 5, 2008
View Article titled, Predicting Knee Replacement Damage in a Simulator Machine Using a Computational Model With a Consistent Wear Factor
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Topics: Cycles, Damage, Knee joint prostheses, Machinery, Wear, Simulation, Cylinders, Geometry
Journal Articles

A Biphasic Model for Micro-Indentation of a Hydrogel-Based Contact Lens

Xiaoming Chen, Alison C. Dunn, W. Gregory Sawyer, Malisa Sarntinoranont
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Technical Papers
J Biomech Eng. April 2007, 129(2): 156–163.
https://doi.org/10.1115/1.2472373
Published Online: September 13, 2006
View Article titled, A Biphasic Model for Micro-Indentation of a Hydrogel-Based Contact Lens
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Topics: Finite element methods, Finite element model, Fluids, Hydrogels, Lenses (Optics), Permeability, Young's modulus, Displacement, Fittings, Testing
Journal Articles

Computational Wear Prediction of UHMWPE in Knee Replacements

D Zhao, W Gregory Sawyer, BJ Fregly
Journal: Journal of ASTM International
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. July 2006, 3(7): 1–6.
https://doi.org/10.1520/JAI100259
Published Online: July 1, 2006
View Article titled, Computational Wear Prediction of UHMWPE in Knee Replacements
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Journal Articles

The Difficulty of Measuring Low Friction: Uncertainty Analysis for Friction Coefficient Measurements

Tony L. Schmitz,, Jason E. Action,, John C. Ziegert, and, W. Gregory Sawyer
Journal: Journal of Tribology
Publisher: ASME
Article Type: Technical Briefs
J. Tribol. July 2005, 127(3): 673–678.
https://doi.org/10.1115/1.1843853
Published Online: June 13, 2005
View Article titled, The Difficulty of Measuring Low Friction: Uncertainty Analysis for Friction Coefficient Measurements
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Topics: Friction, Uncertainty, Transducers, Uncertainty analysis, Tribometers, Calibration