Effect of tensile pre-strain on low-cycle fatigue behaviour of 7050-T6 aluminium alloy

被引：42

作者：

Branco, R. ^{[1
]}

Costa, J. D. ^{[1
]}

Borrego, L. P. ^{[1
,2
]}

Wu, S. C. ^{[3
]}

Long, X. Y. ^{[4
]}

Antunes, F., V ^{[1
]}

机构：

[1] Univ Coimbra, Dept Mech Engn, CEMMPRE, Rua Luis Reis Santos, P-3030788 Coimbra, Portugal

[2] Coimbra Polytech ISEC, Dept Mech Engn, Rua Pedro Nunes, P-3030199 Coimbra, Portugal

[3] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Peoples R China

[4] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2020年 / 114卷

关键词：

Pre-strain; Low-cycle fatigue; Cyclic plastic behaviour; Strain energy density; 7050-T6 aluminium alloy; MICROSTRUCTURE; STRENGTH; STEEL; LIFE;

D O I：

10.1016/j.engfailanal.2020.104592

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The present study addresses the effect of tensile pre-strain histories on cyclic plastic deformation behaviour of 7050-T6 aluminium alloy. Low-cycle fatigue tests are conducted under fully-reversed conditions, with 8% tensile pre-strain, 4% tensile pre-strain, and 0% tensile pre-strain, at different strain amplitudes. After fatigue testing, fracture surfaces are examined by scanning electron microscopy and transmission electron microscopy to identify the main failure micro-mechanisms associated with the levels of pre-strain and strain amplitude. Microstructure is analysed by X-ray diffraction, transmission electron microscopy, and optical microscopy. The main findings suggest that tensile pre-strain histories are conducive to a reduction in fatigue life. This reduction increases with higher strain amplitudes.

引用

页数：14

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