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Title:Razvoj modela za spremljanje degradacije površine materiala med dinamičnim obremenjevanjem : doctoral disertation
Authors:ID Milković, Marijana (Author)
ID Gubeljak, Nenad (Mentor) More about this mentor... New window
ID Đonlagić, Denis (Comentor)
Files:.pdf DOK_Milkovic_Marijana_2024.pdf (10,61 MB)
MD5: D90239C28147C90D1AE1CB6465575CBE
 
Language:English
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Abstract:The study focuses on the behavior of the AA7075-T6 material, widely used in the aerospace industry, under dynamic loadings. The material undergoes processing, including cold rolling and stretching, resulting in residual stress compressive stresses on its surface. The research centers on monitoring changes in the surface condition during dynamic loaidngs using Fiber Bragg Grating (FBG) sensors and numerical simulations. The dissertation includes experimental testing of AA 7075-T6 material samples, numerical simulations of optical fiber responses to tensile loads, and an investigation of surface condition changes using techniques such as focused ion beam engraving and scanning electron microscope observation. The study has shown that the surface condition of the material changes even under low dynamic loads, including variations in surface roughness, residual stresses, and FBG response. Despite low load levels, changes in FBG sensor spectra are observable. The dissertation concludes that the surface condition of the material changes during dynamic loadings, detectable through FBG sensors. It underscores the effectiveness of FBG sensors in monitoring stress levels throughout the material’s service life, particularly on the side lobes of the spectral response. In summary, the research on the dynamic behavior of the AA7075-T6 alloy offers valuable insight into surface condition changes that can impact the integrity and durability of materials in the aerospace industry.
Keywords:fatigue, high cycle load, Fiber Bragg grating
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[M. Milković]
Year of publishing:2023
Number of pages:XVIII, 101 str.
PID:20.500.12556/DKUM-85854 New window
UDC:620.178.2:621.791.053(043.3)
COBISS.SI-ID:182164227 New window
Publication date in DKUM:05.01.2024
Views:466
Downloads:61
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
:
MILKOVIĆ, Marijana, 2023, Razvoj modela za spremljanje degradacije površine materiala med dinamičnim obremenjevanjem : doctoral disertation [online]. Doctoral dissertation. Maribor : M. Milković. [Accessed 13 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=85854
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:14.09.2023

Secondary language

Language:Slovenian
Title:Development of a model for monitoring of surface degradation during fatigue : = doktorska disertacija
Abstract:Študija se usredotoča na obnašanje materiala AA7075-T6, ki je široko uporabljen v letalski industriji, pod dinamičnimi obremenitvami. Material je predelan, vključno s hladnim valjanjem in raztezanjem, kar provzroči preostale kompresijske napetosti na njegovi površini. Raziskava se osredotoča na spremljanje sprememb površinskega stanja, med dinamičnimi obremenitvami z uporabo senzorjev s svetlobnim vlaknom Bragg Grating (FBG) in numeričnimi simulacijami. Doktorska disertacija vključuje eksperimentalno testiranje vzorcev materiala AA7075-T6, numerične simulacije odziva optičnega vlakna na vlačne obremenitve ter preučevanje sprememb stanja površine s tehnikami, kot so graviranje z ionskim žarkom in opazovanje z optičnim mikroskopom. Študija je pokazala, da se površinsko stanje materiala spreminja tudi pri nizkih dinamičkih obremenitvah, vključno s spremembami v hrapavosti površine, preostalimi napetostmi in odzivom FBG. Kljub nizkim obremenitvenim ravni so spremembe v spektrih FBG senzorjev opazne. Doktorska disertacija zaključuje, da se površinsko stanje materiala spreminja med dinamičnimi obremenitvami, kar je zaznavno prek senzorjev FBG. Poudarja učinkovitost senzorjev FBG pri spremljanju ravni napetosti skozi celotno življensko dobo materiala, še posebaj na stranskih režah spektralnega odziva. Skratka, raziskava o dinamičnem obnađanju zlitine AA7075-T6 ponuja deagocene vpoglede v spremembe stanja površine, ki lahko vplivajo na integriteto in trajnost materialov v letalski industriji.
Keywords:utrujenost, visokociklična obremenitev, optično vlakno Bragg Grating


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