Barthelemy, Jean-François (2005) Approche micromécanique de la rupture et de la fissuration dans les géomatériaux. PhD thesis, ENPC.
Abstract
This study deals with physical nonlinearities of geomaterials through a micromechanical approach. The frictional character of these materials needs to adapt the nonlinear homogenization techniques. Various methods for the determination of macroscopic strength criteria are elaborated. The limit states of a medium made up with a frictional matrix are found out depending on the nature of the flow rule (involving dilatancy or not). A micromechanical theory of poroplasticity is then built. It casts a new light on the existence of a poroplastic effective stress. It is proved that, in the case of a frictional matrix, no effective stress can be found. The nonlinearities due to the presence of frictional cracks are finally tackled. The impact of the flow rule governing the (possibly dilating) crack displacement jump and that of the damage propagation on the macroscopic behavior are highlighted.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Dormieux, L. |
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| Date: | April 2005 |
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| Board of examiners: | Zaoui, A. and Leroy, Y. and Ulm, F.-j. and de Borst, R. and Boutin, C. and Dormieux, L. |
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| Collection (Fonds): | ENPC |
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| Institution: | ENPC |
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| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering |
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| Uncontrolled Keywords: | Homogenization, Nonlinear, Strength, Yield design, Fricitional criterion, Poroplasticity, Effective stress, Cracks, Damage, Homogénéisation, Non linéaire, Résistance, Calcul à la rupture, Critère frottant, Poroplasticité, Contrainte effective, Fissures, Endommagement |
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