Extremely low cycle fatigue behaviour of high strength 2024-T351 aluminum alloy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU147221" target="_blank" >RIV/00216305:26210/22:PU147221 - isvavai.cz</a>
Result on the web
<a href="https://www.confer.cz/metal/2022/4497-extremely-low-cycle-fatigue-behaviour-of-high-strength-2024-aluminium-alloy" target="_blank" >https://www.confer.cz/metal/2022/4497-extremely-low-cycle-fatigue-behaviour-of-high-strength-2024-aluminium-alloy</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.37904/metal.2022.4497" target="_blank" >10.37904/metal.2022.4497</a>
Alternative languages
Result language
angličtina
Original language name
Extremely low cycle fatigue behaviour of high strength 2024-T351 aluminum alloy
Original language description
It has been found in recent years that the conventional Manson-Coffin law tends to overestimate the fatigue life at high levels of plastic loading. Such reduction in fatigue life is associated with a fundamental change in the mechanism of damage accumulation. Deterioration of the structure by cracks propagation becomes marginal and the fatigue resistance is governed by the ductility exhaustion phenomenon. The plastic deformation ability under extremely low cycle fatigue conditions is generally related to the occurrence of secondary phases, ie. inclusions and precipitates, dispersed in the matrix. This study investigates the microstructure of hardenable 2024 aluminum alloy and its effect on the cyclic response in the extremely low cycle fatigue region. Metallographic samples of the studied alloy were probed using SEM/EDS and EBSD analysis to identify the morphology and chemical composition of the observed phases. Fatigue tests were conducted in a symmetrical push-pull regime under strain control at room temperature and cyclic plasticity and S-N curves were determined. Electron microscopy observations revealed anisotropic microstructure with numerous fragmented inclusions. Fractographic analysis showed that these hard and brittle secondary phases act as an effective microstructural flaw leading to strong plastic damage accumulation and subsequently to fatigue cracks nucleation. In terms of fatigue life curves, a huge discrepancy in the fatigue data was observed at the extreme levels of cyclic straining. To overcome this shortcoming, a new three-parameter regression function was successfully employed and the obtained results were further discussed.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Metal 2022
ISBN
978-80-88365-06-8
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
714-720
Publisher name
TANGER Ltd.
Place of publication
Ostrava
Event location
Orea Congress Hotel Brno
Event date
May 18, 2022
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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