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Andreas A. Polycarpou
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Journal Articles

Exploring the Impact of HFO-1234YF Refrigerant on the Tribological Properties of Advanced Polymeric Coatings

Ajinkya Raut, Ahmad Amiri, Andreas A. Polycarpou
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. November 2024, 146(11): 111401.
Paper No: TRIB-24-1049
https://doi.org/10.1115/1.4065870
Published Online: July 30, 2024
View Article titled, Exploring the Impact of HFO-1234YF Refrigerant on the Tribological Properties of Advanced Polymeric Coatings
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Topics: Coatings, Compressors, Refrigerants, Tribology, Wear, Friction, Lubrication, Disks, Fourier transform infrared spectroscopy
Proceedings Papers

Automated Evaluation of Written Assignments in Engineering Using Task-Independent Features and Rubric-Guided Features

Wanyu Xu, Daniel A. McAdams, Andreas A. Polycarpou
Proc. ASME. IDETC-CIE2023, Volume 4: 20th International Conference on Design Education (DEC), V004T04A002, August 20–23, 2023
Publisher: American Society of Mechanical Engineers
Paper No: DETC2023-116913
https://doi.org/10.1115/DETC2023-116913
View Paper titled, Automated Evaluation of Written Assignments in Engineering Using Task-Independent Features and Rubric-Guided Features
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Topics: Design education, Feedback, Mechanical engineering, Students, Technical writing
Proceedings Papers

Short Paper: An Initial Investigation of the Correlations Between the Quality of Engineering Assignments and Task-Independent Features

Wanyu Xu, Daniel A. McAdams, Andreas A. Polycarpou
Proc. ASME. IDETC-CIE2022, Volume 4: 19th International Conference on Design Education (DEC), V004T04A011, August 14–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: DETC2022-91031
https://doi.org/10.1115/DETC2022-91031
View Paper titled, Short Paper: An Initial Investigation of the Correlations Between the Quality of Engineering Assignments and Task-Independent Features
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Topics: Design, Design education, Errors, Machine learning, Mechanical engineering, Teaching
Proceedings Papers

Predicting Fly-Height Modulation and Contact Forces in Ultra-Low Flying Head-Disk Interfaces Using a Tri-State Switching Dynamic Contact Model

Sung-Chang Lee, Andreas A. Polycarpou
Proc. ASME. TRIB2001, ASME 2001 Symposium on Nanotribology and Nanotechnology for 1Tbit/in2, 27-35, October 21–24, 2001
Publisher: American Society of Mechanical Engineers
Paper No: TRIB-NANO2001-104
https://doi.org/10.1115/TRIB-NANO2001-104
View Paper titled, Predicting Fly-Height Modulation and Contact Forces in Ultra-Low Flying Head-Disk Interfaces Using a Tri-State Switching Dynamic Contact Model
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Topics: Disks, Dynamics (Mechanics), Air bearings, Contact dynamics, Damage, Degrees of freedom, Design, Dynamic models, Excitation, Rotating disks
Journal Articles

Rough Surface Normal Nanocontact Stiffness: Experimental Measurements and Rough Surface Contact Model Predictions

Jungkyu Lee, Ali Beheshti, Andreas A. Polycarpou
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research-Article
J. Appl. Mech. March 2017, 84(3): 031006.
Paper No: JAM-16-1568
https://doi.org/10.1115/1.4035524
Published Online: January 12, 2017
View Article titled, Rough Surface Normal Nanocontact Stiffness: Experimental Measurements and Rough Surface Contact Model Predictions
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Topics: Stiffness, Surface roughness, Stress, Thin films, Deformation
Journal Articles

Wear Modeling of Nanometer Thick Protective Coatings

Jungkyu Lee, Youfeng Zhang, Robert M. Crone, Narayanan Ramakrishnan, Andreas A. Polycarpou
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. March 2017, 139(2): 021601.
Paper No: TRIB-15-1305
https://doi.org/10.1115/1.4033492
Published Online: August 11, 2016
View Article titled, Wear Modeling of Nanometer Thick Protective Coatings
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Topics: Finite element analysis, Poles (Building), Wear, Disks
Journal Articles

Yield Maps for Single and Bilayer Thin Films Under Scratch

Abhish Chatterjee, Ali Beheshti, Andreas A. Polycarpou, Pascal Bellon
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. July 2016, 138(3): 031402.
Paper No: TRIB-15-1194
https://doi.org/10.1115/1.4032519
Published Online: April 21, 2016
View Article titled, Yield Maps for Single and Bilayer Thin Films Under Scratch
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Topics: Coatings, Film thickness, Friction, Pressure, Simulation, Stress, Thin films, Finite element analysis, Materials properties, Silicon
Journal Articles

Wear Mechanisms of Gray Cast Iron in the Presence of Environmentally Friendly Hydrofluoroolefin-Based Refrigerant and the Effect of Tribofilm Formation

M. Wasim Akram, Andreas A. Polycarpou
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. October 2015, 137(4): 041602.
Paper No: TRIB-14-1303
https://doi.org/10.1115/1.4030711
Published Online: October 1, 2015
View Article titled, Wear Mechanisms of Gray Cast Iron in the Presence of Environmentally Friendly Hydrofluoroolefin-Based Refrigerant and the Effect of Tribofilm Formation
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Topics: Refrigerants, Tribological films, Wear, Tribology, Cast iron, Stress
eBook Chapter

Dynamic Friction Characterization and Modeling of Tripod Constant Velocity Joints

Series: ASTM Manuals
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7036-0
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Journal Articles

An Elastic-Plastic Spherical Contact Model Under Combined Normal and Tangential Loading

Aizhong Wu, Xi Shi, Andreas A. Polycarpou
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research Papers
J. Appl. Mech. September 2012, 79(5): 051001.
https://doi.org/10.1115/1.4006457
Published Online: June 21, 2012
View Article titled, An Elastic-Plastic Spherical Contact Model Under Combined Normal and Tangential Loading
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Topics: Friction, Shear stress, Stress, Tangential loading, Displacement, Finite element model, Coulombs, Stiffness
Proceedings Papers

A Physics-Based Fretting Model With Friction and Integration to a Simple Dynamical System

Melih Eriten, Andreas A. Polycarpou, Lawrence A. Bergman
Proc. ASME. IDETC-CIE2011, Volume 1: 23rd Biennial Conference on Mechanical Vibration and Noise, Parts A and B, 1301-1307, August 28–31, 2011
Publisher: American Society of Mechanical Engineers
Paper No: DETC2011-48660
https://doi.org/10.1115/DETC2011-48660
View Paper titled, A Physics-Based Fretting Model With Friction and Integration to a Simple Dynamical System
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Topics: Dynamic systems, Friction, Physics, Modeling, Surface roughness, Dynamics (Mechanics), Engineering simulation, Materials properties, Micromechanics (Engineering), Simulation
Proceedings Papers

An Elastic-Plastic Spherical Contact Model Under Combined Normal and Tangential Loading

Aizhong Wu, Xi Shi, Andreas A. Polycarpou
Proc. ASME. IJTC2011, ASME/STLE 2011 Joint Tribology Conference, 289-291, October 24–26, 2011
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2011-61126
https://doi.org/10.1115/IJTC2011-61126
View Paper titled, An Elastic-Plastic Spherical Contact Model Under Combined Normal and Tangential Loading
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Topics: Tangential loading, Friction, Coulombs, Displacement, Finite element model, Physics, Shear strength
Proceedings Papers

Molecularly Thin Lubricant Layer Contact Model Accounting for Interfacial Slip

Antonis I. Vakis, Melih Eriten, Andreas A. Polycarpou
Proc. ASME. IJTC2010, STLE/ASME 2010 International Joint Tribology Conference, 397-399, October 17–20, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2010-41249
https://doi.org/10.1115/IJTC2010-41249
View Paper titled, Molecularly Thin Lubricant Layer Contact Model Accounting for Interfacial Slip
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Topics: Accounting, Lubricants, Shear rate, Chemistry, Disks, Molecular dynamics, Storage, Viscosity, Viscosity measurement
Proceedings Papers

Tribological Performance of Polymer-Based Coatings for Oil-Less Piston-Type Compressor Applications

Seung Min Yeo, Emerson Escobar Nunez, Andreas A. Polycarpou
Proc. ASME. IJTC2010, STLE/ASME 2010 International Joint Tribology Conference, 65-67, October 17–20, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2010-41250
https://doi.org/10.1115/IJTC2010-41250
View Paper titled, Tribological Performance of Polymer-Based Coatings for Oil-Less Piston-Type Compressor Applications
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Topics: Coatings, Compressors, Pistons, Polymers, Tribology, Friction, Air conditioning, Carbon dioxide, Cast iron, Climate change
Journal Articles

Erratum: “Application of Elastic-Plastic Static Friction Models to Rough Surfaces With Asymmetric Asperity Distribution” [ Journal of Tribology, 2010, 132(3), p. 031602 ]

Chul-Hee Lee, Melih Eriten, Andreas A. Polycarpou
Journal: Journal of Tribology
Publisher: ASME
Article Type: Errata
J. Tribol. October 2010, 132(4): 047001.
https://doi.org/10.1115/1.4002486
Published Online: October 7, 2010
View Article titled, Erratum: “Application of Elastic-Plastic Static Friction Models to Rough Surfaces With Asymmetric Asperity Distribution” [ Journal of Tribology, 2010, 132(3), p. 031602 ]
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Topics: Friction, Stiction, Surface roughness, Tribology
Journal Articles

Impact of a Fixed-Length Rigid Cylinder on an Elastic-Plastic Homogeneous Body

Raja R. Katta, Andreas A. Polycarpou
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2010, 132(4): 041402.
https://doi.org/10.1115/1.4002331
Published Online: October 1, 2010
View Article titled, Impact of a Fixed-Length Rigid Cylinder on an Elastic-Plastic Homogeneous Body
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Topics: Cylinders, Finite element analysis, Storage, Disks, Contact mechanics, Deformation, Stress
Journal Articles

Application of Elastic-Plastic Static Friction Models to Rough Surfaces With Asymmetric Asperity Distribution

Chul-Hee Lee, Melih Eriten, Andreas A. Polycarpou
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. July 2010, 132(3): 031602.
https://doi.org/10.1115/1.4001547
Published Online: June 15, 2010
View Article titled, Application of Elastic-Plastic Static Friction Models to Rough Surfaces With Asymmetric Asperity Distribution
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Topics: Stiction, Surface roughness, Friction
Journal Articles

Assessment of Elliptical Conformal Hertz Analysis Applied to Constant Velocity Joints

Chul-Hee Lee, Andreas A. Polycarpou
Journal: Journal of Tribology
Publisher: ASME
Article Type: Technical Briefs
J. Tribol. April 2010, 132(2): 024501.
https://doi.org/10.1115/1.4000735
Published Online: March 24, 2010
View Article titled, Assessment of Elliptical Conformal Hertz Analysis Applied to Constant Velocity Joints
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Topics: Finite element analysis, Pressure, Rollers, Stress, Dimensions
Journal Articles

Experimental and FEA Scratch of Magnetic Storage Thin-Film Disks to Correlate Magnetic Signal Degradation With Permanent Deformation

Raja R. Katta, Andreas A. Polycarpou, Sung-Chang Lee, Mike Suk
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021902.
https://doi.org/10.1115/1.4000848
Published Online: March 11, 2010
View Article titled, Experimental and FEA Scratch of Magnetic Storage Thin-Film Disks to Correlate Magnetic Signal Degradation With Permanent Deformation
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Topics: Deformation, Disks, Finite element analysis, Stress, Thin films, Storage
Proceedings Papers

Analysis of Topographical Changes and Adhesion Failures in Gold-to-Gold Metal RF MEMS Switches With Cycling

Seung Min Yeo, Spyros I. Tseregounis, Andreas A. Polycarpou, Adam Fruehling, Dimitrios Peroulis
Proc. ASME. IJTC2009, ASME/STLE 2009 International Joint Tribology Conference, 13-15, October 19–21, 2009
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2009-15120
https://doi.org/10.1115/IJTC2009-15120
View Paper titled, Analysis of Topographical Changes and Adhesion Failures in Gold-to-Gold Metal RF MEMS Switches With Cycling
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Topics: Adhesion, Failure, Metals, Microelectromechanical systems, Switches, Cycles, Atomic force microscopy, Cantilevers, Optical microscopy, Reliability