Research projects are (co)financed by the Slovenian Research and Innovation Agency
- Member of the University of Ljubljana: Faculty of Mechanical Engineering
- Project code: J2-60050
- Science: Engineering sciences and technologies
- SICRIS: Friction reduction with advanced contacts – FRAC
WP1: Selection of materials, lubricants & sample preparation
Task 1.1: Selection of balls made of different materials, coatings, and roughness (realization: 100 %)
Task 1.2: Development and manufacturing of transparent disks made of different materials, coatings, and spacer layers (realization: 100 %)
Task 1.3: Selection of lubricants (realization: 100 %)
WP2: Variable RGB differential colourimetric interferometry (V-RGB-DCI)
Task 2.1: Construction of V-RGB-DCI module (realization: 100 %)
Task 2.2: Calibration with balls and existing techniques (realization: 100 %)
Task 2.3: Modelling of interferograms (realization: 100 %)
Task 2.4: Contact models (realization: 50 %)
Task 2.5: Comparison of the V-RGB-DCI method with existing ones (realization: 100 %)
WP3 – EHD Schlieren photography (realization: 0 %)
WP4 – Implementation of new methods for friction reduction
Task 4.1: 3D measurement of lubricant film thickness and pressure for DLC contacts (realization: 50 %)
Task 4.2: 3D measurement of thin lubricant film thickness and pressure for other dark and coloured engineering surfaces (realization: 75 %)
Task 4.3: Measurements of friction as function of the new parametric space (realization: 25 %)
WP5 – Generation of EHD design tools
Task 5.1: Analysis of thickness and pressure maps (realization: 50 %)
Task 5.2: Regression analysis: generation of simple-to-use formulas (realization: 0 %)
WP6 – Management, exploitation, and dissemination (realization: 50 %)
[1] M. Polajnar, T. Požar, M. Kalin, Perfluorocarboxylic acids as additives for friction reduction in full-film EHD contacts: Influence of additive chain length, Tribology International, Volume 211, 2025, 110892, ISSN 0301-679X, https://doi.org/10.1016/j.triboint.2025.110892.
[2] Polajnar, M.; Požar, T.; Kalin, M. Perfluorotetradecanoic Acid as an Additive for Friction Reduction in Full-Film EHD Contacts: The Role of Functional Group, Base Oil Polarity, Additive Concentration and Contact Pressure. Lubricants 2025, 13, 263, https://doi.org/10.3390/lubricants13060263.