A durability prediction for the magnesium alloy AZ31 based on plastic and total energy

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

Magnesium has a good strength-to-weight ratio. As a result, magnesium alloys are gradually becoming an integral part of lightweight designs that are especially important to the automotive and aerospace industries. The magnesium alloy AZ31 is particularly suitable for forming. Furthermore, as its cyclic response is asymmetric, the accumulated energy during loading is a convenient basis for durability predictions of a product that is made of the AZ31 alloy. In this article, we show how the inverse-power law model can be combined with a Weibull’s probability density function to describe the shape of the fatigue-life curves and their scatter. Various load histories were chosen to characterize the response of the AZ31 alloy under different cyclic loadings. Both the plastic and the total strain energy densities were calculated for all the load histories, and then, a suitable dependence in terms of energy fatigue-life curves was determined. The proposed model is appropriate for modeling the low-cycle fatigue life of the AZ31 alloy. With the application of a linear damage-accumulation rule, it is also possible to predict the fatigue life for the non-constant amplitude loading within one decade of accuracy.

• Language: English
• Keywords: magnesium alloy AZ31, fatigue life, strain-energy density, Weibullʼs probability density function
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: 16 str.
• Numbering: Vol. 9, iss. 9, art. 973
• PID: 20.500.12556/RUL-109459
• UDC: 669.721.5:620.178.3(045)
• ISSN on article: 2075-4701
• DOI: 10.3390/met9090973
• COBISS.SI-ID: 16772379
• Publication date in RUL: 03.09.2019

Record is a part of a journal

• Title: Metals
• Shortened title: Metals
• Publisher: MDPI AG
• ISSN: 2075-4701
• COBISS.SI-ID: 15976214

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: 03.09.2019

Secondary language

• Language: Slovenian
• Keywords: magnezijeva zlitina AZ31, doba trajanja, gostota energije specifične deformacije, Weibullova gostota porazdelitve verjetnosti