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Détail de l'auteur
Auteur Tang-Tat Ng
Documents disponibles écrits par cet auteur
Affiner la rechercheUltimate state of samples of ellipsoids under different stress paths / Tang-Tat Ng in Journal of engineering mechanics, Vol. 134 n°9 (Septembre 2008)
[article]
in Journal of engineering mechanics > Vol. 134 n°9 (Septembre 2008) . - pp.723–729.
Titre : Ultimate state of samples of ellipsoids under different stress paths Type de document : texte imprimé Auteurs : Tang-Tat Ng, Auteur Année de publication : 2008 Article en page(s) : pp.723–729. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Void ratio Granular materials Soil mechanics Stress Stress strain relations Sampling Résumé : The ultimate state of granular material was investigated by the discrete element method. This paper discusses a series of numerical triaxial tests on samples of two kinds of ellipsoids. Samples of three different densities were loaded along various stress paths. The ellipsoids were mixed in the proportions 50:50 by weight. The longer particles have an aspect ratio (major length/minor length) of 1.5 and the other particles have an aspect ratio of 1.2. The samples were generated by deposition under gravity to simulate the air-pluviation sample preparation technique. Then they were consolidated isotropically. Fourteen stress-path controlled triaxial tests were conducted numerically for each sample. They are sheared to the ultimate state to determine the friction angle and void ratio at the ultimate state. When samples of different densities were sheared along the same loading path, a unique ultimate state was observed. The initial density does not affect the ultimate state. However, when different loading paths are applied to the same numerical specimen, they do not always arrive at the same critical state in the void-mean stress space. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A9%2872 [...] [article] Ultimate state of samples of ellipsoids under different stress paths [texte imprimé] / Tang-Tat Ng, Auteur . - 2008 . - pp.723–729.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 134 n°9 (Septembre 2008) . - pp.723–729.
Mots-clés : Void ratio Granular materials Soil mechanics Stress Stress strain relations Sampling Résumé : The ultimate state of granular material was investigated by the discrete element method. This paper discusses a series of numerical triaxial tests on samples of two kinds of ellipsoids. Samples of three different densities were loaded along various stress paths. The ellipsoids were mixed in the proportions 50:50 by weight. The longer particles have an aspect ratio (major length/minor length) of 1.5 and the other particles have an aspect ratio of 1.2. The samples were generated by deposition under gravity to simulate the air-pluviation sample preparation technique. Then they were consolidated isotropically. Fourteen stress-path controlled triaxial tests were conducted numerically for each sample. They are sheared to the ultimate state to determine the friction angle and void ratio at the ultimate state. When samples of different densities were sheared along the same loading path, a unique ultimate state was observed. The initial density does not affect the ultimate state. However, when different loading paths are applied to the same numerical specimen, they do not always arrive at the same critical state in the void-mean stress space. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A9%2872 [...]