CTU in Prague, Prague, Czech Republic

Tomáš Karas

Biography

Tomas Karas is a PhD student at the Faculty of Mechanical Engineering at CTU in Prague. His research focuses on fretting fatigue in steel and additively manufactured materials, as well as mesh stiffness and fatigue in gears.

Conferences

Room

Date

Hour

Subject

Room 10

19-11-2025

3:00 pm – 3:30 pm

30 Application of self-heating method for characterization of 42CrMo4+QT steel under fretting fatigue conditions

Conferences Details

30 Application of self-heating method for characterization of 42CrMo4+QT steel under fretting fatigue conditions

This paper presents fretting fatigue tests on 42CrMo4+QT steel, combined with self-heating measurements. The thermal imaging technique was used for rapid evaluation of the fretting fatigue limit targeting minimal consumption of test samples. Tests with load asymmetry ratios of R = -1 and R = 0 were performed using two different fretting pad geometries. The resulting fatigue limits were compared with values obtained from conventional fretting fatigue S-N curves. Elastic-plastic simulations of the experiments were conducted, and multiaxial fatigue criteria were applied to assess the risk of crack initiation. Additionally, a qualitative assessment was made to predict crack initiation locations according to observations from fractography.

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