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An analytical approach to calculate stress concentration factors of machined surfaces.pdf (1021.Kb)
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Title
An analytical approach to calculate stress concentration factors of machined surfaces
Author
Perez Guisado, IonMondragon Unibertsitatea
ARRAZOLA, PEDRO JOSE ccMondragon Unibertsitatea
Madariaga, Aitor ccMondragon Unibertsitatea
CUESTA ZABALAJAUREGI, MIKEL ccMondragon Unibertsitatea
Soriano, Denis ccMondragon Unibertsitatea
Research Group
Mecanizado de alto rendimiento
Published Date
2021
Publisher
Elsevier Ltd.
Keywords
Surface topography
Stress concentration factor
Fatigue
Modelling
Abstract
Machining operations affect the properties of the final surface layer, and these can impact on its functional per- formance, particularly on fatigue behaviour. Among the properties of the machined sur ... [+]
Machining operations affect the properties of the final surface layer, and these can impact on its functional per- formance, particularly on fatigue behaviour. Among the properties of the machined surface, surface topography is one major parameter affecting fatigue behaviour. The literature review has demonstrated that stress concen- tration factors K t of the surface provide a more reliable estimation of the impact on the fatigue behaviour of machined components. Finite Element (FE) simulations can accurately calculate the stress concentration factor of machined surfaces, but they incur a high computational cost. Recent advances have shown that analytical models can reliably determine stress concentration factors of 2D roughness profiles. However, analytical models that predict stress concentration factors of 3D surface topographies are still lacking. This paper is aimed at devel- oping an analytical method to calculate the stress concentration factor K t of 3D surfaces generated by machining operations. To validate the model, a specimen of 7475-T7351 aluminium alloy was face milled and its surface topography was characterised using an Alicona IFG4 profilometer. Stress concentration factors were calculated in the selected surface regions using the proposed analytical model, and later compared to results obtained by FE simulations. The mean difference in the stress concentration factor K t calculated by the proposed analytical and FE models is of 1.53%. Importantly, the developed analytical model reduces the computing time by 3000 times compared to FE models, and enables the analysis of larger surfaces. [-]
URI
http://hdl.handle.net/20.500.11984/1848
Publisher’s version
https://doi.org/10.1016/j.ijmecsci.2020.106040
ISSN
0020-7403
Published at
International Journal of Mechanical Sciences  Vol. 190. N. artículo 106040, 2021
Document type
Article
Version
Postprint – Accepted Manuscript
Rights
© 2020 Elsevier Ltd.
Access
Embargoed Access (until 2023-01-31)
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  • Articles - Engineering [332]

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