[HTML][HTML] The formation and characterization of fretting-induced degradation layers using quenched and tempered steel

V Nurmi, J Hintikka, J Juoksukangas, M Honkanen… - Tribology …, 2019 - Elsevier
Fretting movement is dangerous for machines, because it can cause cracking and surface
degradation. The aim of this work was to characterize fretting-induced material degradation …

[HTML][HTML] An insight into the effect of rough surfaces and contact orientation on the fretting characteristics of quenched and tempered steel

A Zabihi, J Juoksukangas, J Hintikka, M Honkanen… - Tribology …, 2023 - Elsevier
The effect of a rough, textured surface and contact orientations on the fretting behavior of self-
mated martensitic 34CrNiMo6+ QT steel was examined via a large annular flat-on-flat …

[HTML][HTML] Stable and unstable friction in fretting contacts

J Hintikka, A Mäntylä, J Vaara, T Frondelius… - Tribology …, 2019 - Elsevier
Designing contacts susceptible to fretting is a challenging task due to uncertainties related to
friction. For example, coefficient of friction has shown to vary as a function of load cycles and …

[HTML][HTML] Characterization of cracks formed in large flat-on-flat fretting contact

J Juoksukangas, V Nurmi, J Hintikka, M Vippola… - International Journal of …, 2019 - Elsevier
Fretting fatigue may lead to severe damage in machines. Adhesive material transfer spots in
millimeter scale have previously been observed on fretted surfaces, which have been …

Cracks and degradation layers in large flat-on-flat fretting contact with steels and cast iron

J Juoksukangas, V Nurmi, J Hintikka, M Honkanen… - Tribology …, 2020 - Elsevier
Fretting may deteriorate contacts in terms of wear and cracking. Fretting-induced material
degradation and frictional behaviour was studied experimentally in a large flat-on-flat fretting …

History of structural analysis & dynamics of Wärtsilä medium speed engines

T Frondelius, H Tienhaara, M Haataja - 2018 - oulurepo.oulu.fi
This paper opens up the history of structural analysis and dynamics simulations of Wärtsilä
engines. It cites already published articles and theses with some backgrounds information. It …

[HTML][HTML] Avoiding the initial adhesive friction peak in fretting

J Juoksukangas, J Hintikka, A Lehtovaara, A Mäntylä… - Wear, 2020 - Elsevier
An initial friction peak typically occurs in a dry self-mated quenched and tempered steel
fretting contact in gross sliding conditions. The peak is related to adhesive friction and wear …

Avoiding the high friction peak in fretting contact

J Juoksukangas, J Hintikka… - Rakenteiden …, 2020 - rakenteidenmekaniikka.journal.fi
Fretting fatigue and wear may exist if two parts have small amplitude relative rubbing
between the contacting surfaces. A peak in the coefficient of friction typically occurs during …

Simulation-driven development of combustion engines: theory and examples

T Frondelius, H Tienhaara, J Kömi, M Haataja - 2018 - oulurepo.oulu.fi
This paper describes the simulation-driven design process used in engines technology. The
research question is “how to use research in the structural analysis and dynamics field to …

Fretting test rig with variable normal force

J Meuronen, A Mäntylä, J Vaara, J Hintikka… - 2020 - oulurepo.oulu.fi
Fretting is small amplitude reciprocating sliding between surfaces, and it may quickly causes
surface cracks, which can continue growing under cyclic loads, until the structure breaks …