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Effect of Severe Shot Peening on the Very-High Cycle\nNotch Fatigue of an AW 7075 Alloy
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SYSNO ASEP 0532360 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of Severe Shot Peening on the Very-High Cycle
Notch Fatigue of an AW 7075 AlloyAuthor(s) Jambor, Michal (UFM-A) ORCID, RID
Trško, L. (SK)
Klusák, Jan (UFM-A) RID, ORCID
Fintová, Stanislava (UFM-A) ORCID
Kajánek, D. (SK)
Nový, F. (SK)
Bokůvka, O. (SK)Number of authors 7 Article number 1262 Source Title Metals. - : MDPI
Roč. 10, č. 9 (2020)Number of pages 18 s. Language eng - English Country CH - Switzerland Keywords ultrasonic fatigue testing ; severe shot peening ; notched fatigue ; surface crack initiation ; AW7075 aluminum alloy Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000580166200001 EID SCOPUS 85091095126 DOI 10.3390/met10091262 Annotation 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.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021 Electronic address https://www.mdpi.com/2075-4701/10/9/1262
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