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Influencia del bifasaje sobre las constantes elasticas radiocristalograficas

Abstract : The analysis of residual stresses on two-phase samples is based on the using of XEC (X-ray elastic constants) obtained on an isolated phase. It is supposed that the XEC of a phase are the same, either it's alone or it takes part of a two-phase system. The simulation of the deformation curves versus sin²ψ, using scale transition models leads us to invalidate this hypothesis. The model used is a one site self-consistent one. The simulation of the micro-mechanical behaviour of each modelized inclusion has been performed. Each one is embedded in a matrix which effective macroscopical behaviour can be assimilated to the homogeneous two-phase material. In this work, two types of two-phase materials without texture have been considered : austenoferritical alloys and an aluminium composite with silicium β carbide fibres. The model used shows that the XEC of the analysed phase depends on the volume fraction of the two phases. Neglecting this phenomenon induces a systematic error on the stresses determination using experimental values. If we consider for example a {100} diffracting plane, this systematic error is always lower than 2% in the case of austenoferritical alloys but it can reach 16% for the stresses analysis in the silicium carbide, considering the composite of 15% of SiC and 85% of Al. From those results, it may be deduced that the analysis of two-phase materials with components with different mechanical behaviours (like Al and SiC) might take into account the correct XEC in order to minimize the standard deviation on stress measured values.
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Submitted on : Saturday, May 7, 2022 - 11:25:15 AM
Last modification on : Tuesday, May 10, 2022 - 8:48:53 AM

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Sylvain Fréour, David Gloaguen, Marc François, Ronald Guillen. Influencia del bifasaje sobre las constantes elasticas radiocristalograficas. Revista Matéria, Rede Latino-Americana de Materiais - Latin-American Materials Network, 2001, 6, pp.1-12. ⟨hal-01006984⟩

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