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Micromechanical Explanation of elasticity and strength of gypsum: from elongated anisotropic crystals to isotropic porous polycrystals / Sanahuja, Julien in Journal of engineering mechanics, Vol. 136 N° 2 (Fevrier 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 239-253 Titre : Micromechanical Explanation of elasticity and strength of gypsum: from elongated anisotropic crystals to isotropic porous polycrystals Type de document : texte imprimé Auteurs : Sanahuja, Julien, Auteur ; Dormieux, Luc, Auteur ; Meille, Sylvain, Auteur Article en page(s) : pp. 239-253 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Gypsum  Microstructures  Elasticity  Strength  Micromechanics  Anisotropy. Résumé : Gypsum is made up of interlocked and elongated crystals. The random nature of its morphology suggests to resort to homogenization of random media to investigate its mechanical properties from the scale of the single crystals upwards. Unfortunately, the usual homogenization schemes fail to quantitatively predict the influence of the porosity on the effective Young's modulus of gypsum. This is clearly due to the inability of such approaches to take into account the elongated nature of the crystals. A modification of the classical self-consistent scheme is proposed. It is validated against elastic characteristics computed by finite element analyses, and also against experiments on real dried gypsum samples (with empty pores). Finally, a strength model based on brittle failure is presented. The whole strength domain in the space of macroscopic principal stresses is derived. The comparison to experimental data in both simple tension and simple compression is remarkably good. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Micromechanical Explanation of elasticity and strength of gypsum: from elongated anisotropic crystals to isotropic porous polycrystals [texte imprimé] / Sanahuja, Julien, Auteur ; Dormieux, Luc, Auteur ; Meille, Sylvain, Auteur . - pp. 239-253. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 239-253 Mots-clés : Gypsum  Microstructures  Elasticity  Strength  Micromechanics  Anisotropy. Résumé : Gypsum is made up of interlocked and elongated crystals. The random nature of its morphology suggests to resort to homogenization of random media to investigate its mechanical properties from the scale of the single crystals upwards. Unfortunately, the usual homogenization schemes fail to quantitatively predict the influence of the porosity on the effective Young's modulus of gypsum. This is clearly due to the inability of such approaches to take into account the elongated nature of the crystals. A modification of the classical self-consistent scheme is proposed. It is validated against elastic characteristics computed by finite element analyses, and also against experiments on real dried gypsum samples (with empty pores). Finally, a strength model based on brittle failure is presented. The whole strength domain in the space of macroscopic principal stresses is derived. The comparison to experimental data in both simple tension and simple compression is remarkably good. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]