Improved prediction of low-cycle fatigue life for high-pressure die-cast aluminium alloy AlSi9Cu3 with significant porosity

Tomažinčič, Dejan (author), Borovinšek, Matej (author), Ren, Zoran (author), Klemenc, Jernej (author)

The fatigue life of a high-pressure die-cast alloy, AlSi9Cu3, with significant porosity is investigated. Standard specimens were cyclically loaded (R =-1) until fatigue rupture occurred. The specimens were [micro]-CT scanned to obtain a 3D representation of the pores. Models were used to computationally predict the fatigue life using two different methods. First, the fatigue life was predicted using a notch-strain approach combined with a Coffin- Manson durability relationship for homogeneous material. Second, the fatigue life was predicted using an homogenised un-notched model that was combined with an adapted Coffin-Manson relationship which consid-ered a fatigue life reduction due to different pore effects.

• Language: English
• Keywords: low-cycle fatigue, alloy AlSi9Cu3, porosity, notch-strain approach, finite element removal
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2021
• Number of pages: Str. 1-12
• Numbering: Vol. 144
• PID: 20.500.12556/RUL-124298
• UDC: 519.876.5:620.178.3(045)
• ISSN on article: 0142-1123
• DOI: 10.1016/j.ijfatigue.2020.106061
• COBISS.SI-ID: 46594307
• Publication date in RUL: 14.01.2021

Record is a part of a journal

• Title: International journal of fatigue
• Shortened title: Int. j. fatigue
• Publisher: Elsevier
• ISSN: 0142-1123
• COBISS.SI-ID: 25643520

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: 14.01.2021

Secondary language

• Language: Slovenian

Abstract

Raziskava zajema analizo dobe trajanja zlitine AlSi9Cu3 s prisotno visoko stopnjo poroznosti. Preizkušanci standardnih oblik so bili ciklično obremenjeni (R = -1), do nastalega utrujenostnega loma. Vzorci so bili ob tem [mikro]-CT skenirani, da smo določili 3D geometrijo por. Modeli so bili nato uporabljeni pri izračunu dobe trajanja po dveh različnih metodah. Prvič, dobo trajanja smo napovedali po pristopu z zareznim učinkom v kombinaciji s Coffin-Manson razmerjem za homogeni material. Drugič, dobo trajanja smo napovedali ob uporabi homogenega idealiziranega modela, v kombinaciji s prilagojenim nivojem Coffin-Manson krivulje, ki upošteva znižanje dobe trajanja zaradi različnih učinkov por.

• Keywords: malo-ciklično utrujanje, zlitina AlSi9Cu3, poroznost, pristop z zareznim učinkom, odstranitev končnega elementa

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: J2-8186
• Name: Razvoj večnamenskih avksetičnih celičnih struktur