Investigation of Uniaxial Asymmetric High-cycle Fatigue Failure Behavior of 7075-T651 Aluminum Alloy Sheet

DOI

10.2991/icmsa-15.2015.47How to use a DOI?

Keywords

7075 Aluminum Alloy, High Cycle Fatigue (HCF), S-N Curve, Fatigue Fracture.

Abstract

In this investigation, the high cycle fatigue life of 7075-T651 aluminum sheets under different stress levels were tested, and S-N curves were obtained by fitting the test data. For the problem that the traditional S-N curve fitting methods without considering the effect of fatigue limit on the S-N curve fitting accuracy, the traditional fitting methods were improved, the results show that the improved method can reduce the fitting error. The high- cycle fatigue fracture morphology of 260MPa was observed by scanning electron microscopy (SEM). The observations reveal that the high cycle fatigue fracture morphology shows ductile fracture features. The main reason of the crack nucleation is that the second phase particles on the sub-surface, but the small dispersed precipitates can improve the fatigue performances. The morphology of the fatigue crack propagation is “stair” distribution. The fatigue crack transient beak region is characterized by the mixed-rupture characteristics of quasi-cleavage and dimples.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Da-Lian Yang
AU  - Yi-Lun Liu
AU  - Song-Bai Li
AU  - Jiu-Huo Yi
AU  - Jie Tao
PY  - 2014/06
DA  - 2014/06
TI  - Investigation of Uniaxial Asymmetric High-cycle Fatigue Failure Behavior of 7075-T651 Aluminum Alloy Sheet
BT  - Proceedings of the 2015 International Conference on Material Science and Applications
PB  - Atlantis Press
SP  - 252
EP  - 257
SN  - 2352-541X
UR  - https://doi.org/10.2991/icmsa-15.2015.47
DO  - 10.2991/icmsa-15.2015.47
ID  - Yang2014/06
ER  -