Comprehensive modelling of the hysteresis loops and strain-energy density for low-cycle fatigue-life predictions of the AZ31 magnesium alloy

Klemenc, Jernej (author), Šeruga, Domen (author), Nagode, Aleš (author), Nagode, Marko (author)

Magnesium is one of the lightest metals for structural components. It has been used for producing various lightweight cast components, but the application of magnesium sheet plates is less widespread. There are two reasons for this: (i) its poor formability at ambient temperatures; and (ii) insufficient data on its durability, especially for dynamic loading. In this article, an innovative approach to predicting the fatigue life of the AZ31 magnesium alloy is presented. It is based on an energy approach that links the strain-energy density with the fatigue life. The core of the presented methodology is a comprehensive new model for tensile and compressive loading paths, which makes it possible to calculate the strain-energy density of closed hysteresis loops. The model is universal for arbitrary strain amplitudes. The material parameters are determined from several low-cycle fatigue tests. The presented approach was validated with examples of variable strain histories.

• Language: English
• Keywords: magnesium AZ31, variable loading history, low-cycle fatigue, hysteresis-loop model, energy approach
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering; NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: 24 str.
• Numbering: Vol. 12, iss. 22, art. 3692
• PID: 20.500.12556/RUL-112752
• UDC: 620.178.3(045)
• ISSN on article: 1996-1944
• DOI: 10.3390/ma12223692
• COBISS.SI-ID: 16894235
• Publication date in RUL: 11.11.2019

Record is a part of a journal

• Title: Materials
• Shortened title: Materials
• Publisher: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 08.11.2019

Secondary language

• Language: Slovenian
• Keywords: magnezij, utrujanje, histerezna zanka, energijska metoda, naključna obremenitev