Two fatigue characteristic thresholds, i.e. fatigue limit Δσe and fatigue crack propagation threshold ΔKth, have significant mean stress sensitivity. In the work, a new mean stress correction model for the two fatigue thresholds is proposed based on the cyclic strain energy density concept. Extensive experimental data in the literature is unified evenly by the proposed normalized fatigue threshold-R curves. Besides, a comparison of the proposed model with the existing models is carried out, which demonstrates that the present work can achieve more accurate predictions with the advantage of being of easy use and of being independent on any material constant.

A unified mean stress correction model for fatigue thresholds prediction of metals

Paggi, Marco
Investigation
;
2020

Abstract

Two fatigue characteristic thresholds, i.e. fatigue limit Δσe and fatigue crack propagation threshold ΔKth, have significant mean stress sensitivity. In the work, a new mean stress correction model for the two fatigue thresholds is proposed based on the cyclic strain energy density concept. Extensive experimental data in the literature is unified evenly by the proposed normalized fatigue threshold-R curves. Besides, a comparison of the proposed model with the existing models is carried out, which demonstrates that the present work can achieve more accurate predictions with the advantage of being of easy use and of being independent on any material constant.
Mean stress effect
Fatigue limit
Stress ratio
Strain energy
Dimensional analysis
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11771/17241
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