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Analysis of the multiaxial fatigue strength at the mesoscopic scale using 3D microstructure modeling and extreme value statistics

Hor, Anis and Saintier, Nicolas and Robert, Camille and Palin-Luc, Thierry and Morel, Franck Analysis of the multiaxial fatigue strength at the mesoscopic scale using 3D microstructure modeling and extreme value statistics. (2013) In: 13th International Conference on Fracture (ICF13), 16 June 2013 - 21 June 2013 (Beijing, China).

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Official URL: http://www.gruppofrattura.it/ocs/index.php/ICF/icf13/paper/viewFile/11259/10638

Abstract

Fatigue life computing methods are generally based on putting into equation the mechanical quantities calculated at the micro or meso scale, the relevance of these selected quantities being validated by the capacity of the models to reproduce experimental results at the macroscopic scale. Although the scaling of the damage mechanisms involved in fatigue crack initiation processes are relatively well identified (grain scale, slip bands), their explicit consideration in fatigue criteria is still not well-developed. Furthermore, the existing methods do not consider the microstructure-sensitivity. The aim of this paper is to present the computational strategies developed to account for the microstructure-sensitivity in the calculation of fatigue strength. This work is based on three parts: (1) the development of 3D microstructure modeling tools (2) the analysis of the dispersion induced by the microstructure heterogeneities on the critical fatigue damage indicators and (3) the development of a statistical approach which provides a framework for analyzing calculation results in the HCF (High Cycle Fatigue) regime. In this background, a method of analysis based on the construction of statistical extreme value distributions from FEA calculation results was developed. The evolution of the scaling parameters of these distributions for different loading conditions informed us about the effect of non-proportional loading and microstructure. A design method based on these extreme value statistics is presented to obtain a new mesoscopic criterion sensitive to microstructure parameters. Finally, surface effects are discussed too.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Proceedings of 13th International Conference on Fracture 2013 (ICF-13). Meeting held 16-21 June 2013, Beijing, China. ISBN:9781629933696. Publisher : International Congress on Fracture(ICF)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Other partners > Arts et Métiers ParisTech (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Institut Polytechnique de Bordeaux - IPB (FRANCE)
Other partners > Université de Bordeaux 1 (FRANCE)
Laboratory name:
Statistics:download
Deposited By: Anis Hor
Deposited On:20 Mar 2015 14:53

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