A5054923910- Gear and Bearing Dynamics Analysis
- Tribology and Lubrication Engineering
- Lubricants and Their Additives
- Advanced machining processes and optimization
- Tribology and Wear Analysis
- Mechanical Engineering and Vibrations Research
- Adhesion, Friction, and Surface Interactions
- Hydraulic and Pneumatic Systems
- Metal Alloys Wear and Properties
- Mechanical stress and fatigue analysis
- Metal and Thin Film Mechanics
- Iterative Learning Control Systems
- Engineering Technology and Methodologies
- Thermochemical Biomass Conversion Processes
- Metal Forming Simulation Techniques
- Additive Manufacturing Materials and Processes
- Microstructure and Mechanical Properties of Steels
- Additive Manufacturing and 3D Printing Technologies
- Force Microscopy Techniques and Applications
- Metallurgy and Material Forming
- Ionic liquids properties and applications
- Advanced Measurement and Metrology Techniques
- Engineering Education and Curriculum Development
- High Entropy Alloys Studies
- Diamond and Carbon-based Materials Research
Universidade do Porto
2015-2024
Institute of Mechanical Engineering and Industrial Mangement
2005-2024
National Institute of Statistics and Geography
2021
National Institute of Engineering, Technology and Innovation
2003-2006
Institut National des Sciences Appliquées de Lyon
1989
Centre National de la Recherche Scientifique
1989
Laboratoire de Mécanique des Contacts et des Structures
1986-1987
This work presents the antifriction and antiwear properties of TiO2 nanoparticles coated with oleic acid, TiO2-OA, as additives a low viscosity polyalphaolefin base oil, PAO8. To find optimal concentration nanoadditives that minimize friction wear, four PAO8 based nanodispersions were formulated: + 0.10 wt% 0.25 0.35 TiO2-OA 0.50 TiO2-OA. Tribological experiments performed under pure sliding rolling-sliding conditions at 120 °C, formulated nanolubricants oil. All showed lower coefficients...
The main task of this work is to study the tribological performance nanolubricants formed by trimethylolpropane trioleate (TMPTO) base oil with magnetic nanoparticles coated oleic acid: Fe3O4 two sizes 6.3 nm and 10 nm, Nd alloy compound 19 nm. Coated (NPs) were synthesized via chemical co-precipitation or thermal decomposition adsorption acid in same step. Three nanodispersions TMPTO 0.015 wt% each NP prepared, which stable for at least 11 months. Two different types tests carried out: pure...
This research shows the antifriction and antiwear synergies between a phosphonium ionic liquid (IL) f-WS2 f-SiO2 nanoparticles (NPs) as additives of base oil with low viscosity (PAO6). Mass concentrations 0.1 wt% nanoadditives 1% IL were selected to formulate nanolubricants. Pure sliding rolling–sliding friction tests performed at 120 °C, finding great reductions in comparison PAO6 oil, specifically for double hybrid nanolubricant (PAO6 + 1 f-SiO2). Regarding wear produced, greatest behavior...
Contact stresses are one of the most important parameters in analysis a contact problem found for instance, design gears and roller bearings. In this work influence geometrical surface imperfections on normal pressure distribution is studied. A variational formulation based principle complementary virtual used to solve problem. The between two elastic half-spaces considered, as small when compared dimensions contacting bodies. Results presented determine roughness, wavelength, amplitude distribution.