Prise en compte des contraintes résiduelles de traitement thermique dans la prédiction de la tenue en service des culasses en aluminium

Comte, François; Nguyen-Tajan, Thi Mac-Lan; Morin, Nicolas; Maïtournam, Habibou; Moumni, Ziad

doi:10.1051/meca:2005039

Cited by 2 publications

(2 citation statements)

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“…1). In order to ensure that these components conform to their required specifications, numerical modelling techniques are employed [1,2]. The results from these simulations show that certain zones of these components are subjected to complex multiaxial cyclic stress-stain states, including high mean stress.…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tThis article is dedicated to the high cycle fatigue behaviour of cast hypo-eutectic Al-Si alloys. In particular, the AlSi7Cu05Mg03 alloy is investigated. It presents the results of a vast experimental campaign undertaken to investigate the fatigue behaviour, and more specifically the fatigue damage mechanisms observed under complex loading conditions: plane bending with different load ratios, fully reversed torsion and equibiaxial bending with a load ratio of R = 0.1. A specific test set-up has been designed to create an equibiaxial stress state using disk shaped specimens. A tomographic analysis is also presented with the aim of characterising the micro-shrinkage pore population of the material. It is shown that two distinct and coexisting fatigue damage mechanisms occur in this material, depending on the presence of different microstructural heterogeneities (i.e. micro-shrinkage pores, Silicon particles in the eutectic zones, Fe-rich intermetallic phases, etc.). Furthermore, it is concluded that the effect of an equibiaxial tensile stress state is not detrimental in terms of high cycle fatigue. It is also shown that the Dang Van criterion is not able to simultaneously predict the multiaxial effect (i.e. torsion and equibiaxial tension) and the mean stress effect for this material.

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