Application of the Microstructural Finite Element Alternating Method to assess the impact of specimen size and distributions of contact/residual stress fields on fatigue strength

Larrosa, Nicolas; Chaves, V.; Navarro, A.; Ainsworth, R.A.

doi:10.1016/j.compstruc.2016.10.011

Cited by 4 publications

(2 citation statements)

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“…The use of Microstructural Fracture Mechanics (MFM) techniques within finite elements [205,206] to model the growth of microcracks through the stress gradient associated with a stress concentration feature (e.g, pit/notch, contact, etc.) are becoming available and would allow enhancement of current assessment methods to make them more realistic and accurate.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Corrosion-fatigue: a review of damage tolerance models

Larrosa

Akid

Ainsworth

2017

International Materials Reviews

116

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The synergistic combination of mechanical fatigue stresses and environmental agents acting together can be more detrimental than that of the summation of the contributions of each mechanism acting separately. Major attempts to understand the contribution of the different agents (microstructure, chemical composition of environment, temperature, loading conditions, etc.) have been reported in the literature. Nevertheless, current knowledge is insufficient to address life estimation with a sound physical basis from the initiation of localized corrosion (such as pitting) to the estimation of crack propagation. Major simplifications and assumptions have been required in the development of life prediction methodologies. This paper reviews recent effort made by the different interested parties, both in academia and industry, in the development of corrosion fatigue lifetime prediction procedures. The paper mainly focuses on methodologies proposed in the literature for O&G, nuclear, energy generation and aerospace applications, dealing with pitting corrosion-fatigue (CF) damage in aluminium alloys, carbon and stainless steels. The transition of a pit into a small crack and its growth is influenced by interaction of the pit stress/strain concentration and the local environmental conditions, making the modelling of this stages of the utmost complexity. A major trend in the models reviewed in this paper is to simplify the analysis by assuming the pit (a volumetric defect) as a sharp crack, decouple the CF problem and account for the mechanical and environmental contributions separately. These procedures heavily rely on fitting experimental data and exhibit low generality in terms of application to varying system conditions. There is a clear opportunity in this field to develop mechanistically based methodologies, considering the inherent dependence of the damage mechanism on the interaction of environmental, metallurgical and mechanical features, allowing more realistic lifetime estimates and defect tolerance arguments, where pit-to-crack transition and small crack initiation stages pose a significant challenge.

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Corrosion-fatigue: a review of damage tolerance models

Larrosa

Akid

Ainsworth

2017

International Materials Reviews

116

View full text Add to dashboard Cite

show abstract

“…the scale of cyclic plasticity and the crack tip process zone are of the size of the crack length and span a few microstructural barriers). For example, MFM has been used for analysing different variables on fatigue behaviour, such as grain size effect [36], shot peening effect [37], notch [38,39] and size effects [40], contact and residual stress fields effect [41], among other applications [42,43]. The methodology has been also used to analyse environment-assisted short fatigue crack growth and lifetime [44,45].…”

Section: Introductionmentioning

confidence: 99%