Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 44, Issue 2, Pages 397-409Publisher
WILEY
DOI: 10.1111/ffe.13367
Keywords
Al7050-T7451 alloy; fretting fatigue; relaxed residual stress; shot peening; Ti6Al4V alloy
Funding
- Italian Ministry of Education, University and Research (MIUR) [2017HFPKZY]
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This paper evaluates the fatigue life of shot-peened aluminum and titanium alloy specimens under partial slip regime, and proposes a novel theoretical law for relaxed residual stress field description. The results show promising outcomes in estimating fretting fatigue life of the shot-peened specimens examined.
In the last decades, many alleviation measures were proposed in order to improve the life of fretting fatigue-affected components. In such a context, the shot peening treatment is worth noting. Therefore, in the present paper, the fatigue life of shot-peened aluminium and titanium alloy specimens, subject to fretting fatigue under partial slip regime, is assessed by means of the Carpinteri et al. criterion for fretting fatigue. First, according to the superposition principle, the relaxed residual stresses (due to the shot peening treatment) are combined with the stress components due to fretting fatigue loading. Then fretting fatigue assessment is performed. In such a context, a novel theoretical law for the relaxed residual stress field is here proposed, the implementation of which shows very promising results in terms of fretting fatigue life estimation of the shot-peened specimens examined.
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