Documents disponibles écrits par cet auteur

Micromechanical modeling for inherent anisotropy in granular materials / Chang, Ching S. in Journal of engineering mechanics, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 7 (Juillet 2010) . - pp. 830-839 Titre : Micromechanical modeling for inherent anisotropy in granular materials Type de document : texte imprimé Auteurs : Chang, Ching S., Auteur ; Zhen-Yu Yin, Auteur Année de publication : 2010 Article en page(s) : pp. 830-839 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Granular  material  Anisotropy  Triaxial  test  Micromechanics  Stress-strain  relations  Sand  Material. Résumé : In this paper, a description of inherent anisotropy of soil, based on micromechanics framework, is presented. The problem is formulated by assuming that sliding of two contact particles governed by Coulomb criterion in which the friction angle is a function of the orientation of the interparticle contact. The orientation distribution of these parameters is described by a set of symmetric second-order tensors. The formulation of the problem is illustrated by simulations of Santa Monica Beach Sand under true triaxial tests. In particular, the directional dependence of the strength characteristics is examined for samples with inherent cross anisotropy. The orientations of failure planes between particles are also examined. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Micromechanical modeling for inherent anisotropy in granular materials [texte imprimé] / Chang, Ching S., Auteur ; Zhen-Yu Yin, Auteur . - 2010 . - pp. 830-839. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 7 (Juillet 2010) . - pp. 830-839 Mots-clés : Granular  material  Anisotropy  Triaxial  test  Micromechanics  Stress-strain  relations  Sand  Material. Résumé : In this paper, a description of inherent anisotropy of soil, based on micromechanics framework, is presented. The problem is formulated by assuming that sliding of two contact particles governed by Coulomb criterion in which the friction angle is a function of the orientation of the interparticle contact. The orientation distribution of these parameters is described by a set of symmetric second-order tensors. The formulation of the problem is illustrated by simulations of Santa Monica Beach Sand under true triaxial tests. In particular, the directional dependence of the strength characteristics is examined for samples with inherent cross anisotropy. The orientations of failure planes between particles are also examined. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

Modeling stress-dilatancy for sand under compression and extension loading conditions / Chang, Ching S. in Journal of engineering mechanics, Vol. 136 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 6 (Juin 2010) . - pp. 777-786 Titre : Modeling stress-dilatancy for sand under compression and extension loading conditions Type de document : texte imprimé Auteurs : Chang, Ching S., Auteur ; Zhen-Yu Yin, Auteur Article en page(s) : pp. 777-786 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Sand  Soil  type  Micromechanics  Plasticity  Dilatancy  Compression  Load  factors. Résumé : Experimental results show very different stress-dilatancy behavior for sand under compression and extension loading conditions. In order to describe the behavior in both compression and extension conditions, two separate dilatancy equations are needed; one for each case. Furthermore, the effect of inherent anisotropy has not been considered in those equations. In this paper, a new micromechanics based method is presented, by which the stress dilatancy relation is obtained by considering the slip mechanism of the interparticle contacts in all orientations. The method also accounts for the effect of inherent anisotropy in sand. Experimental results on Hostun sand and LSI-30 sand are used for illustration the proposed method. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Modeling stress-dilatancy for sand under compression and extension loading conditions [texte imprimé] / Chang, Ching S., Auteur ; Zhen-Yu Yin, Auteur . - pp. 777-786. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 6 (Juin 2010) . - pp. 777-786 Mots-clés : Sand  Soil  type  Micromechanics  Plasticity  Dilatancy  Compression  Load  factors. Résumé : Experimental results show very different stress-dilatancy behavior for sand under compression and extension loading conditions. In order to describe the behavior in both compression and extension conditions, two separate dilatancy equations are needed; one for each case. Furthermore, the effect of inherent anisotropy has not been considered in those equations. In this paper, a new micromechanics based method is presented, by which the stress dilatancy relation is obtained by considering the slip mechanism of the interparticle contacts in all orientations. The method also accounts for the effect of inherent anisotropy in sand. Experimental results on Hostun sand and LSI-30 sand are used for illustration the proposed method. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...]