My research focus is on tribology, which investigates the friction, wear and lubrication of contacting surfaces as well as related fundamental failure mechanisms. This gives basis to provide advanced tribological expertise and solutions for developing future design concepts for machine elements and frictional joints to improve their performance, service life and operation monitoring. This work is done with close collaboration with industry using high standard numerical and experimental methods. Main current research interests are fretting induced friction, wear and fatigue in frictional joints as well as lubricated rolling/sliding contacts in gears and bearings related to combustion engines, mineral crushers and gear drives in wind turbines and marine applications. Advanced tribological contact design improves energy efficiency, power density and reliability of machine elements and systems having essential contribution to Finnish industrial competiveness and sustainable development.
Corresponding member: International Tribology Council (ITC), 2001-
Member of Nordic Scientific Advisory Board: NORDTRIB conference series, 2000 –
Tribology (friction, wear and lubrication) and tribological machine elements in general – focusing on
- Fretting induced friction, wear and fatigue in frictional joints
- Lubricated rolling/sliding contacts in machine elements such as gears and bearings
Professor, Materials Science, Tribology and Machine Elements, 2014 –
Professor, TUT, Machine Design, Mechanical Power Transmission and Tribology, 1999 –2013
Docent – Tribology, TUT, 1997-2002
R&D and Project Manager in private sector 1989-1996
Dr. Tech., Tampere University of Technology (TUT), 1989
Bayat R., Lehtovaara A., EHL/mixed transition of fully formulated environmentally acceptable gear oils, Tribology International 146 (2020) 12 p., 106158.
Hintikka J., Mäntylä A., Vaara J., Frondelius T., Lehtovaara A., Stable and unstable friction in fretting contacts, Tribology International, 131 (2019) 73-82.
Nurmi V., Hintikka J., Juoksukangas J., Honkanen M., Vippola M., Lehtovaara A., Mäntylä A., Vaara J., Frondelius T., The formation and characterization of fretting-induced degradation layers using quenched and tempered steel. Tribology International 131 (2019) 258-267.
Juoksukangas J., Lehtovaara A., Mäntylä A., Experimental and numerical investigation of fretting fatigue behavior in bolted joints, Tribology International 103 (2016) 440-448.
Linjamaa A., Lehtovaara A, Larsson R., Kallio M, Söchting S., Modelling and Analysis of Elastic and Thermal Deformations of a Hybrid Journal Bearing. Tribology International 118 (2018) 451-457.
Savolainen M., Lehtovaara A., An approach to investigating subsurface fatigue in a rolling/sliding contact, International Journal of Fatigue 117 (2018) 180-188
Kleemola J., Lehtovaara A., Experimental simulation of gear contact along the line of action, Tribology International 42 (2009) 1453-1459.