Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 91, Issue -, Pages 352-362Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2015.10.022
Keywords
High frequency testing; Combined loading; Variable amplitude fatigue; Life prediction; Small cracks
Funding
- United States Naval Air Systems Command (NAVAIR)
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Aim of this study is an interpretation of the influence of variable-amplitude (VA) cycles superimposed to low-frequency loads on fatigue life of 7075-T651 Al-alloys. Constant-amplitude (CA) 20 kHz stress/strain-life (S-N) and (epsilon-N)-curves with and without superimposed mean loads serve as basis. For combined fatigue loading, life-time measurements were performed. Life-time estimations based on the S-N results reveal a damaging effect of the superimposed ultrasonic vibrations in the high cycle fatigue (HCF) and the very high cycle fatigue (VHCF) regimes. The CA and VA-life time results are correlated with fractographic observations. An interpretation of fatigue lives under combined low and high-frequency VA-loading is proposed considering small/short-crack propagation and arrest mechanisms. (C) 2015 Elsevier Ltd. All rights reserved.
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