Journal Published Online: 20 August 2018
Volume 47, Issue 6

Effect of Pre-deformation on the Multiaxial Low-Cycle Fatigue Resistance of 2024-T4 Aluminum Alloy

CODEN: JTEVAB

Abstract

The effect of pre-deformation on the fatigue properties of 2024-T4 aluminum alloy is evaluated, including pre-tension of 1, 2, 3, and 4 % as well as pre-torsion of 10°, 20°, 30°, and 40°. Multiaxial low-cycle fatigue (LCF) tests are carried out under a constant amplitude sinusoidal wave loading with a tension-torsion ratio √3 in air at room temperature. The results indicate that the multiaxial LCF life of the specimen reduces with the pre-deformation level. The observed mechanical behavior and associated phenomena are directly linked to microstructure characteristics, such as dislocation density, surface defects, and microcracks. The analysis of mechanism reveals a competition between beneficial effects that are due to hardening and detrimental influences that are due to defects that are caused by the pre-deformation. However, the multiaxial loading makes the detrimental influence more prominent. The typical fracture morphology of multiaxial fatigue can be observed. With the consideration of the effect of pre-deformation on fatigue limit, a modified criterion is developed to predict the multiaxial fatigue life of 2024-T4 aluminum alloy.

Author Information

Chen, Y. J.
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Dongli District, Tianjin, P. R. China
Zhou, J.
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Dongli District, Tianjin, P. R. China
Liu, C. C.
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Dongli District, Tianjin, P. R. China
Wang, F. S.
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Dongli District, Tianjin, P. R. China
Pages: 16
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20170503
ISSN: 0090-3973
DOI: 10.1520/JTE20170503