Caractérisation du comportement mécanique sous compression uni-axiale du marbre de Macael -Espagne

Abstract : The research work focuses on the characterization of the mechanical response of Macael s marble under uniaxial compression. The long-term objective is the integration of marble in the construction domain as a support material. Like all heterogeneous material, the mechanical behaviour of calcic marbles is directly linked to the microstructure. A correlation between metamorphic events and the induced microstructure is described in this work. The geological study associated with images analysis, studies of the crystallographic texture and chemical analysis of marble samples, permit to define the characteristics of a Representative Elementary Volume of Blanco de Macael . To characterize the behaviour under uniaxial compression, several tests were carried out. Prior, an experimental research on the influence of test conditions on the mechanical response has been accomplished. Finally, combining acoustic measures, displacement measures and observations of the samples tested at various scales; the initiation, the propagation, and the coalescence of the local damage mechanisms leading to the macroscopic fragile rupture, have been identified. Tests of uniaxial compression in various directions, have demonstrated an anisotropic behaviour of the marble. Three characteristics of the microstructure governing this mechanical response were distinguished (grains morphology, crystal orientation and mineral inclusions). The results of this work constitute the basis for the conception of a numerical tool. The development of the simulation is in progress.
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Kaïs Mehiri. Caractérisation du comportement mécanique sous compression uni-axiale du marbre de Macael -Espagne. Sciences de la Terre. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ006S⟩. ⟨tel-01752568⟩

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