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Home / Materials Express, Volume 10, Number 6

Open Access Low-cycle fatigue behavior of 7075-T6 aluminum alloy at different strain amplitudes

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Authors: Fu, Lei 1 ; Duan, Heng 2 ; Li, Hui 3 ; Lin, Li 4 ; Wang, Qingyuan 1 ; Yao, Ji 2 ; Luo, Yunrong 3 ; 

Source: Materials Express, Volume 10, Number 6, June 2020, pp. 942-947(6)

Publisher: American Scientific Publishers

DOI: https://doi.org/10.1166/mex.2020.1696

Low-cycle fatigue (LCF) life and failure mechanism of 7075-T6 high strength aluminum alloys were investigated under MTS 809. The cycling stress response and the cyclic stress—strain relationships under different strain amplitudes were investigated. Using Manson-Coffin law, the three parameter exponential function equation and the damage function model of tensile hysteresis energy (Ostergren equation), the regression analysis of LCF test data was carried out, it was found that the fatigue life prediction results of the three parameter exponential function equation were better than the other two life prediction methods in terms of statistical analysis methods of standard deviation and dispersion band. Analysis of microstructure and fatigue failure fracture revealed that fatigue crack initiated at the interface of precipitations and α-phase aluminium substrate in surface or near surface of the sample.

Keywords: Failure Mechanism; Life Prediction; Low-Cycle Fatigue (LCF) Life

Document Type: Research Article

Affiliations: 1: School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China 2: Faculty of Civil Engineering and Architecture, Kunming University of Science and Technology, Kunming 650000, China 3: College of Mechanical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China 4: School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong 643000, China

Publication date: 01 June 2020

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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