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Article

Effect of Severe Shot Peening on the Very-High Cycle Notch Fatigue of an AW 7075 Alloy

1
CEITEC IPM, Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 513/22, 616 00 Brno, Czech Republic
2
Research Centre of the University of Žilina, University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia
3
Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 513/22, 616 00 Brno, Czech Republic
4
Department of Materials Engineering, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia
*
Author to whom correspondence should be addressed.
Metals 2020, 10(9), 1262; https://doi.org/10.3390/met10091262
Received: 24 August 2020 / Revised: 16 September 2020 / Accepted: 17 September 2020 / Published: 18 September 2020
(This article belongs to the Section Metal Failure Analysis)
The severe shot peening process was applied to the notched specimens from an AW 7075 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 diffraction methods and near-surface microstructural observations by scanning electron microscopy. The applied severe shot peening increased the fatigue limit by 11%; however, the positive effect 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. View Full-Text
Keywords: ultrasonic fatigue testing; severe shot peening; notched fatigue; surface crack initiation; AW7075 aluminum alloy ultrasonic fatigue testing; severe shot peening; notched fatigue; surface crack initiation; AW7075 aluminum alloy
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MDPI and ACS Style

Jambor, M.; Trško, L.; Klusák, J.; Fintová, S.; Kajánek, D.; Nový, F.; Bokůvka, O. Effect of Severe Shot Peening on the Very-High Cycle Notch Fatigue of an AW 7075 Alloy. Metals 2020, 10, 1262. https://doi.org/10.3390/met10091262

AMA Style

Jambor M, Trško L, Klusák J, Fintová S, Kajánek D, Nový F, Bokůvka O. Effect of Severe Shot Peening on the Very-High Cycle Notch Fatigue of an AW 7075 Alloy. Metals. 2020; 10(9):1262. https://doi.org/10.3390/met10091262

Chicago/Turabian Style

Jambor, Michal, Libor Trško, Jan Klusák, Stanislava Fintová, Daniel Kajánek, František Nový, and Otakar Bokůvka. 2020. "Effect of Severe Shot Peening on the Very-High Cycle Notch Fatigue of an AW 7075 Alloy" Metals 10, no. 9: 1262. https://doi.org/10.3390/met10091262

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