0532360 - ÚFM 2021 RIV CH eng J - Článek v odborném periodiku
Jambor, Michal - Trško, L. - Klusák, Jan - Fintová, Stanislava - Kajánek, D. - Nový, F. - Bokůvka, O.
Effect of Severe Shot Peening on the Very-High Cycle
Notch Fatigue of an AW 7075 Alloy.
Metals. Roč. 10, č. 9 (2020), č. článku 1262. ISSN 2075-4701. E-ISSN 2075-4701
Grant CEP: GA MŠMT(CZ) LQ1601
Institucionální podpora: RVO:68081723
Klíčová slova: ultrasonic fatigue testing * severe shot peening * notched fatigue * surface crack initiation * AW7075 aluminum alloy
Obor OECD: Materials engineering
Impakt faktor: 2.351, rok: 2020
Způsob publikování: Open access
Web výsledku:
https://www.mdpi.com/2075-4701/10/9/1262DOI: https://doi.org/10.3390/met10091262

The severe shot peening process was applied to the notched specimens from an AW7075
alloy with the aim to improve fatigue endurance in the very-high cycle fatigue region. To reveal the
stress state in the notch vicinity, finite element analysis was performed, simulating the conditions
of the used 20 kHz ultrasonic fatigue loading. Modified surface characteristics by the severe shot
peening process were analyzed in terms of residual stress distribution measured by X-ray di raction
methods and near-surface microstructural observations by scanning electron microscopy. The applied
severe shot peening increased the fatigue limit by 11%, however, the positive e ect was recorded
only for the loading amplitudes corresponding to the fatigue lifetimes in the range 107–109 cycles.
At higher loading amplitudes, the fatigue properties tended to decrease, most likely due to accelerated
fatigue crack initiation on the surface damage features created by the peening process and also by
rapid residual stress relaxation.
Trvalý link: http://hdl.handle.net/11104/0311447