Dr. J.A. Osara | People Pages: Find employees & contact details | University of Twente

Dr. Jude A. Osara is an assistant professor in the Surface Technology & Tribology (STT) and Tribology Based Maintenance (TBM) research areas in the department of Mechanics of Solids, Surfaces and Systems (MS3). He obtained his PhD in Mechanical Engineering - Thermal/Fluids Systems at the University of Texas at Austin, Texas, USA, with a dissertation on "degradation thermodynamics", an approach he applied to lubricating grease degradation, battery cycling, and general fatigue. Prior to his PhD degree, Jude worked in the automotive industry as a thermal/fluids engineer optimizing engine performance, and as an applied mechanics engineer analyzing/optimizing lubrication and structural integrity of engine overhead systems. Between 2017 and 2020, Dr. Osara further developed his PhD research discovery into engineering analysis tools for industrial use, while doing stints as a post-doctoral fellow and an adjunct professor at the University of Texas at Austin. At UT Austin, Dr. Osara taught Applied Thermodynamics and Fluid Mechanics. Currently, he teaches Tribology, and his research focuses on lubricant grease and solid interfacial degradation, life models, failure mechanisms, and materials, all of which he applies his thermodynamics expertise to. He also manages the SKF University Technology Centre (UTC) for Grease Lubrication. Externally, Dr. Osara is an associate editor of ASME Journal of Tribology, a technical editor for STLE TLT, and a four-time guest editor of MDPI's Applied Mechanics.

Expertise

Material Science
- Lubricating Grease
- Ball Bearing
- Film Thickness
- Characterization
- Thermal Degradation
Engineering
- Grease
Physics
- Entropy
- Model

Organisations

Physics-Based Characterization of Systems.
Lubricating Greases, Bearings, and Tribological Interfaces.
Mechanics of Solids, Semi-Solids, and Fluids.
Failure Mechanisms and Prediction.
Materials.

Publications

Jump to: 2025 | 2024 | 2023 | 2022 | 2021

2025

Analytical predictions and experimental measurements of EHL film thickness in wide elliptical and line contacts (2025)Tribology international, 212. Article 110893. Gao, M., Osara, J. A., van Zoelen, M. T., Meeuwenoord, R., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2025.110893Cool It! On Energy Dissipation, Heat Generation and Thermal Degradation: The Microstructurothermal Entropy and Its Application to Real-World Systems (2025)Applied Mechanics, 6(3). Article 62. Osara, J. A.https://doi.org/10.3390/applmech6030062On the thermal degradation of lubricant grease: Degradation analysis (2025)Journal of tribology, 148(2). Article 024603 (E-pub ahead of print/First online). Dokter, J. & Osara, J. A.https://doi.org/10.1115/1.4069430On the Thermal Degradation of Lubricant Grease: Experiments (2025)Journal of tribology, 147(9). Article 091119. Dokter, J. & Osara, J. A.https://doi.org/10.1115/1.4068738Experimental Study of the Effect of Thickener on the Film Thickness in the Contacts of a Grease-Lubricated Ball Bearing at Low Speed (2025)Tribology transactions, 68(1), 28-38. Okal, M., Kostal, D., Osara, J. A., Lugt, P. M., Krupka, I. & Hartl, M.https://doi.org/10.1080/10402004.2024.2431523

2024

Film Thickness in Grease-Lubricated Deep Groove Ball Bearings — A Master Curve (2024)Tribology transactions, 67(5), 1057-1068. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1080/10402004.2024.2398239Effect of bearing size on film thickness in grease-lubricated axially loaded deep groove ball bearings (2024)Tribology international, 197. Article 109748. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2024.109748On the film thickness in grease lubricated deep groove ball bearings (2024)[Thesis › PhD Thesis - Research UT, graduation UT]. University of Twente. Shetty, P.https://doi.org/10.3990/1.9789036561679Systems and Methods for Transformation and Degradation Analysis (2024)Entropy, 26(6). Article 454. Osara, J. A. & Bryant, M. D.https://doi.org/10.3390/e26060454Vibrations and film thickness in grease-lubricated deep groove ball bearings (2024)Tribology international, 193. Article 109325. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2024.109325Methods to Calculate Entropy Generation (2024)Entropy, 26(3). Article 237. Osara, J. A. & Bryant, M. D.https://doi.org/10.3390/e26030237Effect of Grease Filling on the Film Thickness in Deep-Groove Ball Bearings (2024)Tribology transactions, 67(1), 62-69. Shetty, P., Meijer, R. J., Osara, J. A., Pasaribu, R. & Lugt, P. M.https://doi.org/10.1080/10402004.2023.2282632Grease material properties from first principles thermodynamics (2024)Lubrication science, 36(1), 36-50. Osara, J. A., Chatra, S. & Lugt, P. M.https://doi.org/10.1002/ls.1672On the Required Energy to Break Down the Thickener Structure of Lubricating Greases (2024)Tribology transactions, 67(1), 123-128. Meijer, R. J., Osara, J. A. & Lugt, P. M.https://doi.org/10.1080/10402004.2023.2297041

2023

The lubrication mechanism behind the transition from churning to bleeding in grease lubricated bearings – Experimental characterization (2023)Tribology international, 183. Article 108375. Sathwik Chatra, K. R., Osara, J. A. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2023.108375The process of churning in grease lubricated bearings: Identification and Thermo-mechanical characterization (2023)[Thesis › PhD Thesis - Research UT, graduation UT]. University of Twente. Kalsanka Ramakrishna, S. C.https://doi.org/10.3990/1.9789036555081Thermo-mechanical aging during churning in grease lubricated bearings and its impact on grease life (2023)Tribology international, 181. Article 108248. Sathwik Chatra, K. R., Osara, J. A. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2023.108248On the evolution of oil-separation properties of lubricating greases under shear degradation (2023)Tribology international, 179. Article 108154. Hogenberk, F., Osara, J. A., Ende, D. v. d. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2022.108154

2022

Oil Separation in Lubricating Greases (2022)[Contribution to conference › Poster] M2i Conference 2022. Hogenberk, F., Osara, J. A., van den Ende, D. & Lugt, P. M.Impact of grease churning on grease leakage, oil bleeding and grease rheology (2022)Tribology international, 176. Article 107926. Chatra, K. R. S., Osara, J. A. & Lugt, P. M.https://doi.org/10.1016/j.triboint.2022.107926Measuring Film Thickness in Starved Grease-Lubricated Ball Bearings: An Improved Electrical Capacitance Method (2022)Tribology transactions, 65(5), 869-879. Shetty, P., Meijer, R. J., Osara, J. A. & Lugt, P. M.https://doi.org/10.1080/10402004.2022.2091067Thermodynamic Characterization of Grease Oxidation-Thermal Stability via Pressure Differential Scanning Calorimetry (2022)Tribology transactions, 65(3), 542-554. Osara, J. A., Lugt, P. M., Bryant, M. D. & Khonsari, M. M.https://doi.org/10.1080/10402004.2022.2050452Grease Life Prognostics: Remaining Grease Life Estimation by Measuring Grease Properties and Using Predictive Models (2022)[Contribution to conference › Poster] M2i Conference 2021. Hogenberk, F., Osara, J. A. & Lugt, P. M.

2021

Evaluating Degradation Coefficients from Existing System Models (2021)Applied Mechanics, 2(1), 159-173. Osara, J. A. & Bryant, M. D.https://doi.org/10.3390/applmech2010010

Research profiles

Affiliated study programs

Courses academic year 2025/2026

Courses in the current academic year are added at the moment they are finalised in the Osiris system. Therefore it is possible that the list is not yet complete for the whole academic year.

Courses academic year 2024/2025

New thermodynamics method enhances maintenance and prevents failures in engineering systems

https://www.engineersonline.nl/wat-doet-warmte-eigenlijk-met-onze-systemen-en-apparaten/

https://www.earth.com/news/heat-quietly-destroys-both-mechanical-and-human-performance-systems-from-the-inside-out/

Address

University of Twente

Horst Complex (building no. 20)
De Horst 2
7522 LW Enschede
Netherlands

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